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Important Questions Class 8 Science Chapter 16

Home > CBSE > Important Questions Class 8 Science Chapter 16

case study questions class 8 science light

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Important Questions Class 8 Science Chapter 16 – Light

Chapter 16 of Class 8 Science is about Light. The chapter Light starts with the concepts and meaning of light and the laws of reflection. Students might have already heard the word reflection in the previous chapter. In this unit, students learn what reflection is and what laws are associated with it.  This chapter will answer the most common questions in students’ minds, like how can a visually impaired person read. How can an owl see only at night but not during daylight? What is the braille system? And other such questions. In this chapter, you will also study the human eye and the construction of the human eye. Students will also learn fun experiments for explaining reflections, such as how to build a kaleidoscope. By completing this chapter, students will be capable of understanding many interesting concepts

Extramarks is an online learning platform providing educational resources to lakhs of students. One of the important features of our study material is that we provide a lot of questions and solutions. Students can master any subject or topic with the practice of relevant questions. Students can refer to our question bank of Important Questions Class 8 Science Chapter 16 to gain a better understanding of the concepts covered in Chapter ‘Light’. The Important Questions: Class 8 Science Chapter 16 will boost students’ confidence and preparation for the exam. The question bank covers all varieties of questions that are helpful for the students to understand the concepts in the best way.

Our in-house experienced Science faculty members prepare our question bank Chapter 16 Class 8 Science Important Questions and all of its solutions. The questions are taken from different authentic sources such as the NCERT textbook, past year’s question papers, and NCERT exemplar books. It includes MCQ types of questions, and short and long-answer questions based on the CBSE exam pattern. Students are advised to register on the Extramarks website and access unlimited and extended study materials on the desired topics.

Get Access to CBSE Class 8 Science Important Questions 2022-23 with Chapter-Wise Solutions

You can also find CBSE Class 8 Science Chapter-by-Chapter Important Questions here:

Important Questions Class 8 Science Chapter 16 – With Solutions

Considering that our team has collated questions from different sources in one place, our question bank of Class 8 Science Chapter 16 Important Questions has proven helpful for a lot of students. Our Science expert faculty members have prepared detailed and step-by-step instruction-based answers for each of the questions covered in our question bank. Students will be able to fully revise the chapter while they are solving questions.

Below are a few questions and their solutions from our question bank of Important Questions Class 8 Science Chapter 16.

Question 1. Image formed in a plane mirror undergoes _______________. 

Answer 1. lateral inversion.

The reversal of a mirror image, where the object’s right side appears on the left side behind the mirror, is known as lateral inversion.

Question 2. Name the part of the eye that gives a distinctive colour. 

Answer 2. Iris is the part of our eye that gives us distinctive colour. The iris is a coloured ring that surrounds our pupils and gives our eyes their distinct colour.

Question 3. The lens that focuses light on the back of the eye, on a layer called___________. 

Answer 3. Retina.

Several thousand light-sensitive cells (rods and cones) and some other nerve cells make up the retina, which receives and organises visual data. Through our optic nerve, retina sends this information to  brain, allowing us to see.

Question 4. What is a blind spot?

Answer 4. There are no sensory cells at the optic nerve and the retina intersection. Hence, vision is not possible there. This is known as the blind spot.

Question 5. ____________ are sensitive to bright light in eye.

Answer 5. Cones.

In the retina, cones are a kind of photoreceptor cell. They are responsible for our colour perception. Cones are concentrated in the macula, located in the centre of our retina and help us see small details.

Question 6. Lack of which nutrient element is responsible for eye troubles?

Answer 6. The deficiency of Vitamin A causes eye troubles. Xerophthalmia is a progressive eye problem caused by a lack of vitamin A. Xerophthalmia can progress to night blindness or more serious damage to the cornea, the outer layer of the eye.

Question 7. Some persons may lose their vision because of a _________ or an __________. 

Answer 7. Disease, injury.

Question 8. Who developed a system for visually impaired people and published it in 1821? 

Answer 8. The Braille system was developed in the 1820s by Louis Braille and is the most commonly used resource for visually challenged people. Blind individuals read and write using the Braille system. A set of raised bumps or dots can be sensed with the help of a finger in the Braille system.

Question 9. Do you think a light ray is an idealisation? Why? 

Answer 9. Yes, a ray of light is an idealisation. A narrow beam of light is made up of several rays. For simplicity, the word ray is used for a little light beam.

Question 10. Give any two uses of the periscope. 

Answer 10. Tanks, submarines, and soldiers in bunkers use periscopes to see things outside.

Question 11. List the food items that contain vitamin A.

Answer 11. Vitamin A is abundant in raw carrots, broccoli, green vegetables (such as spinach), and cod liver oil. Vitamin A is found in eggs, milk, curd, cheese, butter, and fruits like papaya and mango.

Question 12. State laws of reflection.

Answer 12. ‘The incidence angle is equal to the reflection angle,’ says the first law of reflection.

The incident reflected, and normal rays drawn at the point of incidence to the reflecting surface lie in the same plane, per the second law of reflection.

Question 13. Give any four examples of luminous objects.

 Answer 13. The sun, fire, candle flame, and an electric lamp are luminous objects.

Question 14. Explain regular reflection with the help of a diagram. 

Answer 14. A regular reflection is a reflection made from a smooth surface like a mirror. Regular reflection creates images.

Question 15. What is the function of the retina? 

Answer 15. The lens directs incident light to the retina, which includes several nerve cells. The nerve cells’ sensations are then transferred to the brain through the optic nerve.

Question 16. Give an example to show that reflected light can be reflected again. 

Answer 16.  Stand in front of a mirror and ask a friend to hold a mirror behind you so you can see your haircut; your hair image will appear in the mirror in front of you; this is the best example of reflected light returning to the source.

Question 17. Can we see objects in the dark? Why? 

Answer 17. When the incident light is reflected by the object and reaches our eyes, we can see it. However, when the object reflects no light, we cannot see it.

Question 18. How do you make a kaleidoscope?

Answer 18. Make three small rectangular mirror strips, each about 15 cm long and 4 cm wide, to make a kaleidoscope. Connect them together to make a prism. Place these mirrors in a circular cardboard tube or a tube made of thick chart paper. Assemble the tube such that it is slightly bigger than the mirror strips. Close one end of this tube with cardboard with a hole in the middle that you can see through. Put a piece of the transparent plastic sheet under the cardboard to make it more durable. Fix a round plate glass on the opposite end, touching the mirrors. Place numerous pieces of coloured glass on this glass plate (broken pieces of coloured bangles). A round glass plate is used to close this end of the tube. Make sure there’s enough space for the coloured pieces to move around. Now the kaleidoscope is ready to be used.

Question 19. Write any five ways to take care of your eyes.

Answer 19. Some common measures to take care of the eyes are as follows-

  • Use suitable eyewear if advised.
  • It is not good for the eyes to have too little or too much light. Eye strain and headaches are caused by insufficient light. The retina can be impaired by too much light, such as sunlight, a strong lamp, or a laser torch.
  • Do not look directly at the sun or bright light.
  • Do not rub your eyes. If dust particles enter your eyes, rinse them with clean water. If your condition does not improve, go to the doctor.
  • Always read books at a comfortable distance for your eyes. Avoid reading the book too close to your eyes or keeping it too far away when reading.

Question 20. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Answer 20. If a person is inside a room with no light, it is impossible to see the object inside the dark room, but the object outside the room is seen easily.

When light falls on the eyes after reflecting from the object, it becomes visible. If the room is dark, the objects in the room reflect no light. Hence, the person cannot see the objects in the room without light.

Question 21. Mention the following, whether regular or diffused reflection, which will occur when a light beam strikes. Justify your answer in each case.

(a) A Polished wooden table.

(b) Chalk powder.

(c) A Cardboard surface.

(d) A Marble floor with some water spread over it.

(e) A Mirror.

(f) A Piece of paper.

Answer 21. a) A wooden table that has been polished-regular reflection.

A surface polished recently is an example of a smooth surface. A wooden table that has been polished has a smooth surface.

b) White chalk powder used in school- diffused reflection

chalk powder spread over a surface is a good example of an irregular surface. Hence, it is rough. Therefore, the diffused reflection will appear from the chalk powder.

c) Cardboard surface- diffused reflection.

The cardboard surface is a type of irregular surface.Hence, the diffused reflection will occur from a cardboard surface.

d) Marble floor – regular reflection.

A marble floor can be a good example of a stable surface. Since water makes the ceramic shiny, , the reflections are regular occurrences on this surface.

e) Mirror- regular reflection

A mirror has a very smooth surface, giving a regular reflection.

f) Piece of paper- diffused reflection

Although a piece of paper looks smooth, it has many irregularities on its surface. Due to this, it will give a diffused reflection.

Question 22. State the laws of reflection.

Answer 22. The law of reflection states that

  • a) The angle of incidence and angle of reflection are always equal.
  • b) At the point of incidence, the incident ray, reflected ray, and normal to the reflective surface all lie in the same plane.

Question 23. Describe that the incident ray, the reflected ray, and the normal at the point of incidence lie in the same plane.

Answer 23. On a table, place a plane mirror normal to the plane of the table. Make a small hole in a piece of paper and hold it perpendicular to the table. Try this experiment in a dark room. Put one more piece of paper on the table to make contact with the mirror. Draw a perpendicular line to the mirror on the piece of paper on the table. Now beam light rays with the help of a torch will pass through the small hole so that the light beam hits the normal at the lower part of the mirror. The light rays from the hole incident on the mirror will reflect the ray of light. Looking at the paper on the table, we can simply show that the incident ray, normal ray, and reflected ray at the incidence point lie in the same plane.

Question 24. What will be the angle of incidence of a ray when the reflected ray is perpendicular to the incident ray?

Answer 24. If the reflected ray lies perpendicular to the incident ray, then the angle of incidence is 45 degrees. According to the laws of reflection, the incidence angle and the angle of reflection are equal. Hence, the incidence ray and angle of reflection are 90/2=45 degrees.

Question 25. How many images of the candle will be seen if it is placed between two parallel plane mirrors separated by a distance of 40 cm?

Answer 25. When a candle is placed between two parallel plane mirrors separated by 40 cm, multiple and infinite images will be seen due to the multiple reflections between the mirrors. An unlimited number of images are formed when two mirrors are placed parallel to each other.

Question 26. The part of the eye which controls the light entering is called –

Answer 26. The answer is option (a) iris.

Explanation – Iris is a dark, muscular part behind the cornea. Its function is to regulate the entry of light.

Question 27. We can see a non-luminous object when light-

(a) completely passes through the object.

(b) gets completely absorbed by the object.

(c) emitted by the object falls on our eye.

(d) is reflected from the object towards the eye.

Answer 27. The answer is option (d) is reflected from the object towards the eye.

Question 28. A light ray incident on mirror A at an angle of 25 degrees falls on mirror B after reflection. The angle of reflection for the reflected ray from mirror B would be-

(a) 25 degrees.

(b) 50 degrees.

(c) 65 degrees. 

(d) 115 degrees.

Answer 28. The answer is option (c) 65 degrees.

Explanation- The angle of reflection for the ray reflected from mirror B will be 65° because the reflected ray from mirror A forms an incident ray on mirror 6 and is then reflected by an angle of 65°.

Question 29. Which statements are correct regarding rods and cones in the human eye?

(a) Cones are sensitive to dim light.

(b) Cones are sensitive to bright light.

(c) Rods are sensitive to bright light.

(d) Rods can sense colour.

Answer 29. The answer is option (b) Cones are sensitive to bright light.

Explanation- Cones are sensitive to bright light; hence, they sense colour, whereas rods are sensitive to dim light and cannot sense colour.

Question 30. Which part of the eye gives colour to our eyes?

Answer 30. Iris of the eye gives colour to the eyes.

Question 31. While waving his hand fastly in front of his eyes, Boojho observes that his fingers appear blurred. What could be the reason for it?

Answer 31. The persistence of vision is the reason for the blurred vision of Boojho; while waving his hand fastly in front of his eyes, he observes that his fingers appear blurred.

Question 32. How often is a ray of light reflected by two plane mirrors placed parallel and facing each other?

Answer 32. Two plane mirrors reflect an infinite number of times, a ray of light placed parallel and facing each other.

Question 33. The angle between the ray of incidence and the reflected ray is 60°. What is the angle of incidence?

Answer 33. The answer is 30°.

Explanation- The angle of reflection is equal to the angle of incidence.

Since, the Angle of incident ray+ Angle of reflected ray is 60°.

The angle of incidence = 30°

Question 34. What happens to the light when it gets dispersed? Give an example.

Answer 34. When the light gets dispersed, it gets split into its constituent colours. Ex: rainbow.

Question 35. The eyes of nocturnal animals have large corneas and large pupils. How does this structure help them?

Answer 35. They can see objects even in low light. A large pupil and a large cornea help lighter enter their eyes.

Question 36. What type of lens is found in our eyes? Where does it form the image of the object?

Answer 36. Our eyes have a convex lens, forming the image on the retina.

Question 37. Which part of the eye gets affected when someone suffers from a cataract? How is it treated?

Answer 37. If a person suffers from a cataract, their eye lens will become cloudy. Cataracts can be cured by replacing the opaque lens with an artificial lens.

Question 38. Explain the process which enables us to recognise motion in a cartoon film.

Answer 38.A Carton movie is a projection of a static picture. 24 pictures are shown in one second in a specific order, giving us the perception of movement.

Question 39. How is the phenomenon of light reflection used in making a kaleidoscope? What are the uses of a kaleidoscope?

Answer 39. The kaleidoscope gives several images formed by reflection from the mirrors inclined towards one another. Designers and artists use a kaleidoscope to get ideas for new patterns to design wallpapers, jewellery, and fabrics.

Question 40. What is a periscope? How many mirrors are there in a periscope?

Answer 40. A periscope is an instrument that reflects the reflected ray again. It is made of a tube attached to a set of mirrors. There are two mirrors in a periscope.

Question 41. State the various uses of a periscope.

Answer 41. Uses of periscope-

  • It is used to see over and around an object.
  • It is used to see over a wall.
  • Used in warfare.

Question 42. Can you see your image in a plane mirror? Write two characteristics of the image so formed.

Answer 42. Yes, we can see our image in a plane mirror. The image formed will be-

  • Virtual and erect.
  • The same size as the object

Question 43. Explain why a book lying on the table in a room can be seen from all  parts of the room.

Answer 43. A book lying on the table in a room can be seen from all parts of the room because of the light reflection falling on it.

Question 44. We can see the sun because it is glowing. How can we see the moon?

Answer 44. We see the moon because the light from the sun falls on the moon and is reflected on the earth.

Question 45. Write the two types of reflection of light. What kind of reflection makes us see an object from all directions?

Answer 45. The two types of light reflection are- regular reflection of light and diffuse reflection of light.

The regular reflection of light makes us see an object from all directions.

Question 46. A wall reflects light and a mirror also reflects light. What is the difference in the way they 

reflect light?

Answer 46. Reflection of light from the wall is a diffused reflection, and reflection of light from a mirror is a regular reflection.

Question 47. What are the main parts of the human eye?

Answer 47. The main parts of the human eye are-

Iris, Lens, Pupil, Cornea, Retina, Ciliary muscles, and Optic nerve.

Question 48. What is the vision range of a normal person?

Answer 48. A normal human eye’s vision range is from 25cm to infinity.

Benefits of Solving Important Questions Class 8 Science Chapter 16

Our question bank of Class 8 Science Chapter 16 Important Questions covers questions from different topics covered in the Light chapter.

Students can face difficulty understanding complex topics in Science. One way to resolve this is to practise Important Questions Class 8 Science Chapter 16. The question bank covers all the important topics, and these questions are created from an exam point of view and are most likely to be asked in the exam. Practising Important Questions Class 8 Science Chapter 16 gives students a competitive edge.

Here are some benefits of solving questions from our question bank of Important Questions Class 8 Science Chapter 16.

  • The comprehensive question guide puts together important questions from different sources. So it’s easy for students to refer only to our question bank instead of referring to multiple sources and wasting time in searching for them. The answers to each question are prepared by experienced science teachers. They provide step-by-step answers with deep conceptual explanations which helps students prepare for exams in a balanced manner.
  • The series of Important Questions Class 8 Science Chapter 16 consists of objective types, short answers, and long answers. These questions adhere to the latest CBSE syllabus and are based on the exam format as prescribed by NCERT. So, students can confidently rely on our question  patterns and solutions for their exam preparation.
  • The solutions provide details required in clearing the question paper, which can benefit students during final exam preparation and their future career paths and achievements.

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Q.1 Answer the following questions:

  • What primarily distinguishes unicellular organisms from multicellular organisms?
  • State the function of pseudopodia in Amoeba .
  • Give an example of a single cell in humans which can change its shape.

Marks: 3 Ans

  • Cell number primarily distinguishes unicellular organisms from multicellular organisms. Unicellular organisms are made up of a single cell, while multicellular organisms are made up of multiple cells.
  • Pseudopodia are the projections that protrude out of the body of Amoeba and help in movement and capturing of food.
  • White blood cells in humans are single-celled and can change their shape.

Q.2 What is the need of staining a section of tissue, before observing it under the microscope? Name a stain.

Marks: 2 Ans

Staining with coloured dyes makes the cellular parts clearly visible. The dyes react with cellular components to give colour to the components. Methylene blue is a blue dye that is often used to stain onion peel cells.

Q.3 Read the following functions of a certain part of cells. i. Protection against abiotic factors ii. Providing shape and rigidity to the cells iii. Selective diffusion of the materials across it iv. Site of photosynthesis Which of the following function(s) are carried out by the cell wall?

A. i and ii

B. ii and iii

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Cbse class 8 science important questions, chapter 1 - crop production and management.

case study questions class 8 science light

Chapter 2 - Microorganisms : Friend and Foe

Chapter 3 - synthetic fibres and plastics, chapter 4 - materials : metals and non-metals, chapter 5 - coal and petroleum, chapter 6 - combustion and flame, chapter 7 - conservation of plants and animals, chapter 8 - cell - structure and functions, chapter 9 - reproduction in animals, chapter 10 - reaching the age of adolescence, chapter 11 - force and pressure, chapter 12 - friction, chapter 13 - sound, chapter 14 - chemical effects of electric current, chapter 15 - some natural phenomena, chapter 17 - stars and the solar system, chapter 18 - pollution of air and water, faqs (frequently asked questions), 1. where can students easily get important questions class 8 science chapter 16.

To make it simpler for students to learn, revise, and prepare for their examinations, Extramarks provides a list of Important Questions Class 8 Science Chapter 16. With this comprehensive series of questions prepared by experts, topics from every nook and corner of the chapters are covered, thus ensuring that the students achieve better grades in their examinations. You can rely completely upon it as you get authentic and correct solutions to the Science Class 8 Chapter 16 Important Questions.

2. Is the series of Important Questions Class 8 Science Chapter 16 enough to score good marks?

The solutions we provide here at Extramarks are concise and written from an examination point of view. The answers to the exercise questions are clearly explained with examples. They are completely accurate. These solutions will help students prepare for their exams as we follow the guidelines provided by the NCERT book and the CBSE Science syllabus. These solutions will help students develop a conceptual foundation that explains all key concepts in an easy-to-get language. This exercise will cover all the topics and subtopics that your Class 8 Science exams could be expected to cover.

Along with this, we recommend students first start their studies with NCERT study materials, including the NCERT textbook and NCERT exemplar books.

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Cbse, ncert and icse solution online, class 8 science case study question, case study question class 8 science (cbse / ncert board).

Class 8 Science Case Study Question and Answer: CBSE / NCERT Board Class 8 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 8 Science.

There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

, Synthetic Fibres and Plastics, Materials: Metals and Non-Metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell – Structure and Functions, Reproduction in Animals, Reaching the Age of Adolescence, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water

For any problem during learning any Case or any doubts please comment us. We are always ready to help You.

CBSE Class 8 Science Case Study Question

  • Chapter 1 Crop Production and Management Case Study Question
  • Chapter 2 Microorganisms: Friend and Foe Case Study Question
  • Chapter 3 Synthetic Fibres and Plastics Case Study Question
  • Chapter 4 Materials: Metals and Non-Metals Case Study Question
  • Chapter 5 Coal and Petroleum Case Study Question
  • Chapter 6 Combustion and Flame Case Study Question
  • Chapter 7 Conservation of Plants and Animals Case Study Question
  • Chapter 8 Cell – Structure and Functions Case Study Question
  • Chapter 9 Reproduction in Animals Case Study Question
  • Chapter 10 Reaching the Age of Adolescence Case Study Question
  • Chapter 11 Force and Pressure Case Study Question
  • Chapter 12 Friction Case Study Question
  • Chapter 13 Sound Case Study Question
  • Chapter 14 Chemical Effects of Electric Current Case Study Question
  • Chapter 15 Some Natural Phenomena Case Study Question
  • Chapter 16 Light Case Study Question
  • Chapter 17 Stars and the Solar System Case Study Question
  • Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

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Chapter 16 Class 8 - Light

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Check out the NCERT Solutions, Notes, Experiments, Activities and some Extra Questions for Chapter 16 Class 8 Science - Light.

Everything is provided free of cost, and is the best education material available for Light Class 8.

In this chapter, we will study - 

  • How do we see objects?
  • What are visible and invisible objects?

What are Luminous and Non-Luminous Objects?

and the Difference between them

  • What is Incident Ray, Reflected Ray and Normal
  • What is Angle of Incidence and Angle of Reflection

What are Laws of Reflection

Regular and Diffused Reflection

Image formed a Plane Mirror and its characteristics

What exactly is Lateral Inversion

Multiple Reflections of Light

and its applications like Periscope

What is a Kaleidoscope ? 

How can we construct a Kaleidoscope

What is Dispersion of Light

The Human Eye - and its different parts

What is the function of Iris and Pupil?

What is a blind spot ?

Other Important Points about Human Eye like Eyelids, Range of Vision, How do we see moving objects

What is Visual Impairment?

What is Braille System

How to take proper care of eyes?

In addition to this, we have also provided some Practice Problems - both 1 mark and 2+ Marks. They are in the Extra Question link given below.

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Note : When you click on a link below, the first question will open. To open other questions, scroll down to the bottom. You will get a list with arrows. It has everything you will need

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NCERT Solutions for Class 8 Science Chapter 16 Light

NCERT Solutions for Class 8 Science Chapter 16 Light

Chapter 16 Light Class 8 Science NCERT Solutions

Class 8 science chapter 16 light ncert questions and answers - topics, chapter 16 light ncert solutions for class 8 science  - notes, chapter 16 light class 8 science questions and answers - mcq questions with answers, contact form.

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case study questions class 8 science light

NCERT Solutions for Class 8 Science Chapter 16 Light

NCERT Solutions for Class 8 Science Chapter 16 Light are given below. Here we have provided the best and error-free answers to all the exercise questions that will strengthen your foundation in science. Solving NCERT questions will assist you in grasping the content in the Crop Production and Management chapter in a better way.

In these solutions, we have answered all the intext and exercise questions provided in NCERT class 8 science textbook.  NCERT Solutions for Class 8 Science Chapter 16 Light provided in this article are strictly based on the CBSE syllabus and curriculum. Students can easily download these solutions in PDF format for free or can read them online.

Light Class 8 Science NCERT Solutions

Exercise Questions

Question 1: Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Answer: We can see any object when light reflected by that object reaches to our eyes. But in the dark room, no light is reflected by the object. Hence, we are not able to see the objects in dark room. But if there is light outside the room, we can see the objects lying out there.

Question 2: Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Answer: 

Question 3: Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. 

(a) Polished wooden table (b) Chalk powder  (c) Cardboard surface over it  (d) Marble floor with water spread (e) Mirror (f) Piece of paper

(a) Polished wooden table → Regular reflection

A polished surface is an example of a smooth surface. A polished wooden table has a smooth surface. Hence, reflections from the polished table will be regular.

(b) Chalk powder → Diffused reflection

Chalk powder has an irregular surface. So, when a beam of light reflects from it, a diffused reflection will take place.

(c) Cardboard surface → Diffused reflection

Cardboard has an irregular surface. So, when a beam of light reflects from it, a diffused reflection will take place.

(d) Marble floor with water spread over it → Regular reflection

Marble floor with water spread over it is an example of a regular surface. This is because water makes the marble surface smooth. Hence, regular reflection will take place from this surface.

(e) Mirror → Regular reflection

A mirror has a smooth surface. So, when a beam of light reflects from it, a regular reflection will take place.

(f) Piece of paper → Diffused reflection

A piece of paper may appear smooth but it has many minor irregularities. So, when a beam of light reflects from it, a diffused reflection will take place.

Question 4: State the laws of reflection.

Answer: Laws of reflection states that:

(i) The angle of incidence is always equal to the angle of reflection. 

(ii) The incident ray, the reflected ray and the normal to the surface at the point of incidence lie in the same plane.

Question 5: Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Answer: Fix a white sheet of stiff paper on a drawing board or a table. Let the sheet project a little beyond the edge of the table. Take a comb and close all its openings except one in the middle with the help of a black paper. Hold the comb perpendicular to the sheet of paper. Throw light from a torch through the opening of the comb from one side so that a ray of light can be seen along the paper on the other side of the comb. Place a strip of plane mirror in the path of the light ray. This ray of light striking the mirror is called the incident ray. After striking the mirror, the ray of light is reflected in another direction. This is called the reflected ray.

Now, cut the projecting portion of the sheet in the middle. Look at the reflected ray. Make sure that the reflected ray extends to the projected portion of the paper. Bend that part of the projected portion on which the reflected ray falls. The reflected ray that fell along this part can no longer be seen.This shows that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Question 6. Fill in the blanks in the following.

(a) A person 1 m in front of a plane mirror seems to be _______________ m away from his image.

(b) If you touch your ____________ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ____________.

(c) The size of the pupil becomes ____________ when you see in dim light.

(d) Night birds have ____________ cones than rods in their eyes.

(a) A person 1 m in front of a plane mirror seems to be  2m  away from his image.

(b) If you touch your  left  ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with the  left hand.

(c) The size of the pupil becomes  large  when you see in dim light.

(d) Night birds have  fewer  cones than rods in their eyes.

Question 7: Angle of incidence is equal to the angle of reflection.

(a) Always (b) Sometimes (c) Under special conditions (d) Never

Answer: (a) Always The angle of incidence is always equal to the angle of reflection. This is the first law of reflection.

Question 8: Image formed by a plane mirror is

(a) virtual, behind the mirror and enlarged.

(b) virtual, behind the mirror and of the same size as the object.

(c) real at the surface of the mirror and enlarged.

(d) real, behind the mirror and of the same size as the object.

Answer: (b) virtual, behind the mirror and of the same size as the object.

The image formed by a plane mirror is of the same size as the object. The image is formed behind the mirror. The image cannot be obtained on a screen. Hence, it is a virtual image.

Question 9: Describe the construction of a kaleidoscope.

Answer:  A kaleidoscope is made up of three rectangular mirror strips joined together to form a prism. These are fixed in circular cardboard-like tube or tube of a thick chart paper. The tube is slightly longer than the mirror strips. One end of the tube remains closed by a cardboard disc having a hole in the centre, through which one can see. To make the disc durable, a piece of transparent plastic sheet is pasted under the cardboard disc. At the other end, touching the mirrors, a circular plane glass plate is fixed. On this glass plate, several small pieces of coloured glass are placed to form multiple images. 

NCERT Solutions for Class 8 Science Chapter 16 Light image 1

Question 10: Draw a labelled sketch of the human eye.

Answer:  

NCERT Solutions for Class 8 Science Chapter 16 Light image 2

Question 11:   Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advice?

Answer:   Intensity of laser beam is very high, as it carries large amount of energy. It is harmful for eyes and can cause permanent damage. One should not look at laser beam directly or indirectly for a longer period.

Question 12:   Explain how you can take care of your eyes.

Answer:  To protect our eyes, the given points should be taken into account:

(i) Visit an eye specialist regularly.

(ii) Avoid reading in dim light and very bright light.

(iii) Avoid direct exposure of sunlight to the eye.

(iv) Clean your eyes with cold water quickly if dust particles or small insects enter your eye. Do not rub your eyes.

(v) Maintain a distance of at least 25 cm between the book and your eyes while reading.

Question 13: What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Answer: We know that angle of incident ray is equal to angle of reflected ray. ⇒ ∠𝑖 = ∠𝑟

But it is given that ∠𝑖 + ∠𝑟 = 90° ⇒ ∠𝑖 + ∠𝑖 = 90° [Since, ∠i = ∠r] ⇒ 2∠𝑖 = 90° ⇒ ∠𝑖 = 45° Angle of incidence = 45°.

Question 14: How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Answer: Infinite number of images will be formed  because of multiple reflections between the mirrors.

Question 15: Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. 16.19. Draw the reflected ray from the second mirror.

NCERT Solutions for Class 8 Science Chapter 16 Light image 3

Question 16: Boojho stands at A just on the side of a plane mirror as shown in Fig. 16.20. Can he see himself in the mirror? Also can he see the image of objects situated at P, Q and R?

NCERT Solutions for Class 8 Science Chapter 16 Light image 5

Answer: Boojho can’t see his own image because he is not standing in front of the mirror. However, he is able to see objects at P and Q because the rays coming from P and Q get reflected by the mirror and reach to his eyes. The ray from object R does not reflect and reaches Boojho, so, he cannot see object R.

NCERT Solutions for Class 8 Science Chapter 16 Light image 5

Question 17: (a) Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21). 

(b) Can Paheli at B see this image? 

(c) Can Boojho at C see this image? 

(d) When Paheli moves from B to C, where does the image of A move?

NCERT Solutions for Class 8 Science Chapter 16 Light image 7

Answer: (a) The image of the object at position A will be formed behind the mirror. It will be at the same distance away from mirror as the object is. 

(b) Yes. Paheli at B can see the object because reflected ray from A will reach B.

(c) Boojho can also see the image because his eyes receive the reflected ray from A.

(d) If we trace the reflected rays from B and C backwards, they converge at point behind the mirror. Position of image A remains fixed even if Paheli moves from B to C.

NCERT Solutions for Class 8 Science Chapter 16 Light image 8

NCERT Solutions for Class 8 Science Chapter 16 – A Brief Discussion

CBSE Class 8 Science NCERT Solutions Chapter 16 helps students to clear their doubts and to score good marks in the board exam. All the questions are solved by experts with a detailed explanation that will help students complete their assignments & homework. Having a good grasp over CBSE NCERT Solutions for Class 8 Science will further help the students in their preparation for board exams and other competitive exams such as NTSE, Olympiad, etc.

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  • Important Questions for CBSE Class 8 Science 2023-24

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CBSE Class 8 Science Chapter wise Important Questions - Free PDF Download

Class 8 Science is a very crucial subject that needs proper attention from the students. Preparing all the chapters in this subject will help students to boost their overall scores in the exams. This is where students will need the assistance of Class 8 Science Important Questions with Answers PDF for all chapters. Apart from the exercises, these important questions can boost the preparation of the students. The experts have solved all these questions to assist in preparing this subject properly.

If you are currently studying in Class 8 , consider it one of your school life milestones as you start entering into in-depth studies related to Science. You need to solve Class 8 Science’s important questions apart from studying the Science book in such a scenario. You can expect your syllabus to comprise different aspects of scientific studies. The question papers with the solution can be the best support for those who are weak in Science or fear facing the challenge of learning complicated concepts of higher-level Science. The NCERT Class 8 Science important questions and their CBSE solutions can act as the students’ study materials. 

You can also download NCERT Solution for Class 8 Science and Class 8 Maths to help you to revise complete syllabus and score more marks in your examinations.

Significance of CBSE Class 8 Science Important Questions with Answers PDF

There are 18 chapters included in the Class 8 Science syllabus that covers vivid topics related to pollution, astronomy, light, natural phenomena, sound, force, friction, etc. These chapters need the highest attention from the students to complete preparing the syllabus. To reinforce the concepts and scientific principles, students can use the Class 8 Science Important Questions with Solutions for all chapters.

Class 8 Science Term 2 Important Questions with Solutions have been compiled by following the latest CBSE syllabus to cover all the essential topics in the chapters. These questions are formulated by following the question patterns and formats of the CBSE board. In fact, the solutions are framed in a more straightforward tone so that students can easily comprehend the context behind the questions and can relate to the answers.

These Important Questions for Class 8 Science Board Exam can be used as an evaluation tool by the students. They can solve the questions once the chapters are completed and compare their answers to the solutions. This way, they can spot the gaps in the preparations and focus on the important sections of the chapters further.

Advantages of CBSE Important Questions for Class 8 Science Board Exam

The questions have been compiled for individual chapters. Hence, the list contains separate files dedicated to all the chapters. It will become easier for the students to find the files and add them to their practice sessions.

The solutions provided with the questions are framed in a comprehensive way so that students can memorise them easily and recall them during the exams to score more.

Resolving doubts will be much easier when you have the Class 8 Science Important Questions with Answers PDF in your hands. Refer to the solutions and clarify your queries instantly to proceed with your preparation.

Follow the standard answering format of the solutions to keep your answers at par with the CBSE Class 8 standards and score more.

Download CBSE Class 8 Science Important Questions 2023-24 PDF

Also, check CBSE Class 8 Science Important Questions for other chapters

Chapterwise Important Questions for CBSE Class 8 Science

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Class 8 Science: Chapter-wise Important Questions

Chapters Included In Class 8 Science NCERT Book

As a student, you must know about the chapters included in the Science book of Class 8 NCERT Science book. Moreover, the relevance of some chapters in their everyday life is given here in brief:

Microorganisms: While studying the chapter on microorganisms, you will acquire knowledge regarding life under a microscope. Moreover, here you will understand which are friendly to us and the ones which are not.

Materials and Their Nature: The chapter dealing with materials and their nature is covered in one of the chapters of the Science book. You can read the book and refer to the study materials of Vedantu to understand all about the matter in detail.  

Light: A chapter in the Science book for Class 8 deals with the concepts of light. You can understand how light travels and how you can split and converge white light. In the Science book, you can also find the basic experiments that you can do with light. The NCERT Class 8 Science important questions come from this chapter.  

Coal and Petroleum: While studying the chapter coal and petroleum, you can know about the mines and get a clear picture of how a mine works. Moreover, you can also know the places in India where the mines are found. The information about the revenue earned by the country from the coal mines is also mentioned in the chapter. 

Sound: Sound is another most important chapter which you can study in detail with the NCERT Science book of Class 8. There are different experiments that you can know about from the book. Expect to learn the numerics related to the chapter also. 

So, it is clear that the Science book of Class 8 has a combination of the chapters that belong to its main streams like Chemistry, Physics, and Biology.

Solved Examples

Q1. What is the Difference Between a Virus from Other Organisms?

Answer: The main difference between all other microorganisms from a virus is that it grows inside a host cell. All other unicellular organisms grow independently. 

Q2. What are the Types of Reproductions that Occur in Living Organisms?

Answer: In all living organisms, there are two types of reproduction such as asexual reproduction and sexual reproduction. Asexual reproduction mainly happens in lower class organisms, where the higher ones reproduce sexually.

CBSE Class 8 Science Study Materials

Other cbse class 8 important questions related links, download class 8 science important questions with answers pdf 2023.

Get the free PDF version of these questions and solutions for all the chapters. Practice answering these questions and develop your concepts better. Learn how to attempt to answer such fundamental questions by following the solutions and gaining confidence to stay ahead of the competition.

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FAQs on Important Questions for CBSE Class 8 Science 2023-24

1. What is the relevance of practising extra questions of Class 8 Science?

Ans: You can enjoy a lot of perks while solving more questions that are generally available on the Vedantu website. It can help you write different answers for a common question as per the right concept that can fetch good marks. The best you can do is consult with the experts of Vedantu and go through the papers available on their site. Moreover, the Vedantu question papers can help you to revise a chapter after completion. Mostly, you can enhance the language and presentation style of the answers while solving the papers. Make sure to draw the diagrams wherever needed as it can boost up the chances of getting marks.

2. Why is it important to find CBSE question papers for preparing a Science chapter, and where can we get them?

Ans: You should always get the CBSE question papers for solving as it can help you know the examination pattern. So, you can get questions in a familiar language while facing the examination. You can visit the site of Vedantu and get all the question papers. There are links where you can click and see the questions based on years. Remember to pick up random question papers from the Vedantu site and solve it multiple times in the intervals of short periods. Access to the question papers is free and you can easily download the pdf versions from the site.

3. What are the chapters included in the NCERT book of Class 8 Science?

Ans: The NCERT book of Class 8 Science consists of the following chapters:

Chapter 1–Crop Production and Management

Chapter 2 –Microorganisms: Friend or Foe

Chapter 3–Synthetic Fibres and Plastics

Chapter 4–Materials: Metals and Non-Metals

Chapter 5–Coal and Petroleum

Chapter 6–Combustion and Flame

Chapter 7–Conservation of Animals and Plants

Chapter 8 - Cell- Functions and Structure

Chapter 9–Reproduction in Animals

Chapter 10–Reaching the Age of Adolescence

Chapter 11–Force and Pressure

Chapter 12–Friction

Chapter 13–Sound

Chapter 14–Chemical Effects of Electric CurrentChapter 15–Some Natural Phenomena

Chapter 16 - Light

Chapter 17–Star and The Solar System

Chapter 18–Pollution of Water and Air

4. How can I develop the best study plan for Class 8 Science?

Ans: To develop the best study plan for Class 8 Science obey the given points:

Managing time is very important. Therefore, create a timetable so that you can focus on every chapter.

Use the NCERT book for reading the chapters as the content of the book is prepared by professionals.

Take the help of Vedantu’s website for downloading the important questions of all the chapters.

Work out on the sample papers and previous years question papers to have a strong grip on the topics.

5. What is the method that students follow to download the important questions of Class 8 Science?

Ans: Beneath are the steps that will be helpful in downloading the important questions of Class 8 Science:

Visit the link of Important Questions for CBSE Class 8 Science, Chapter wise Solutions - Free PDF Download.

As the link will open, the official page of Vedantu will appear on the screen of your device.

This official page will provide you with the list of the chapters of Class 8 Science.

Select the chapter you want to download for the important questions.

Then hit on the “Download PDF” option.

The important questions will get downloaded in PDF format.

6. What are the benefits of downloading and studying important questions of Class 8 Science from Vedantu?

Ans: The perks of studying or downloading important questions of Class 8 Science from Vedantu are:

The content is prepared by the subject matter experts.

Important questions of all the chapters are available.

These problems are based on the NCERT syllabus. 

Vedantu allows you to study offline by giving the option to download the important questions.

These important questions are available in the form of PDF files. These solutions are available at free of cost on Vedantu(vedantu.com) and mobile app.

Vedantu also allows you to ask your doubts through online chat.

7. How to achieve good results in Class 8 Science?

Ans: Below are the points which will help students in getting a good result in Class 8 Science:

To start with your preparation, first know about your syllabus.

Study every chapter from the NCERT book.

Make use of mock tests and previous years sample papers to get a hint about the exam pattern.

Have a habit of writing. This will improve your writing speed and help you to learn things faster.

While giving the exam, try to solve those questions first whose answer you know.

Important Questions for CBSE Class 8

Cbse class 8 study materials, home tuitions in india.

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  • Chapter 16: Light

NCERT Exemplar Class 8 Science Solutions for Chapter 16 - Light

Ncert exemplar solutions class 8 science chapter 16 – free pdf download.

The NCERT Exemplar Solution for Class 8 Science Chapter 16 Light provides you with details on the types and the level of difficulty of questions that are usually asked in the CBSE Class 8 examination and other competitive examinations. Hence, it is important for students to refer to the NCERT Exemplar Solution . The exemplar has a variety of questions like multiple-choice questions, match the following, fill in the blanks, short answer questions, very short answer questions, long answer questions and numerical problems.

Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. In this chapter, students will learn about the different properties of light and their sources. Along with these, they will be introduced to the laws of reflection and how a human eye works or how eyes see images. Solve and practise higher-order thinking questions of this chapter from NCERT Exemplar Class 8 Science  Chapter 16 Light.

Download the PDF of the NCERT Exemplar Class 8 Science Solutions for Chapter 16 – Light

NCERT Exemplar solution class 8 science chapter 16 part 01

Access Answers to the NCERT Exemplar Class 8 Science Chapter 16 – Light

Multiple choice questions.

1. Part of the eye which controls the light entering is called

Answer is (a) iris

Explanation:

Iris is a dark muscular structure exists behind the cornea. Its function is to control the entry of light.

2. We can see a non-luminous object when light:

(a) emitted by the object falls on the eye.

(b) is reflected from the object towards our eye.

(c) completely passes through the object.

(d) gets completely absorbed by the object.

The answer is (b) is reflected from the object towards our eye.

3. Light is falling on surface S1, S2, S3 as shown in Fig.16.1.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 1

Surfaces on which the angle of incidence is equal to the angle of reflection is/are

(a) S1 only

(b) S1 and S2 only

(c) S2 and S3

(d) all the three surfaces

The answer is (d) all the three surfaces

Laws of reflection are always followed irrespective of the surface of the object hence the angle of incidence is equal to the angle of reflection.

4. A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of the eye with respect to the position of the bulb is shown in Fig.16.2 as A, B, C and D. In which position mirror will be visible?

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 2

Answer is (a) A

In case of A ray of light from A strikes mirror and gets reflected back to make an angle of incidence and angle of reflection equal.

5. A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in Fig. 16.3. The pencil of light coming out of the hole falls on a mirror.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 3

At which point should the eye be placed so that the hole can be seen?

The eye should be placed at position A because the hole can be seen only when the angle of incidence is equal to the angle of reflection.

6. Two mirrors A and B are placed at right angles to each other as shown in Fig.16.4.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 4

A ray of light incident on mirror A at an angle of 25 0 falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

Answer is (c) 65 0

The angle of reflection for the ray reflected from mirror B will be 65° because reflected ray from mirror A forms incident ray on mirror 6 and then reflected back by an angle of 65°.

7. Which of the following statements is correct regarding rods and cones in the human eye?

(a) Cones are sensitive to dim light.

(b) Cones are sensitive to bright light.

(c) Rods are sensitive to bright light.

(d) Rods can sense colour.

The answer is (b) Cones are sensitive to bright light.

Cones are sensitive to bright light hence they sense the colour whereas rods are sensitive to dim light and they cannot sense colour.

8. In the figure of the human eye (Fig.16.5), the cornea is represented by the letter

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 5

Answer is (c) C

Very Short Answer Questions

9. Name the part of the eye which gives colour to the eyes

Iris the part of the eye which gives colour to the eyes.

10. Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?

Persistence of vision is the reason for the blurred vision of Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred.

11. How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?

An infinite number of times a ray of light reflected by two plane mirrors placed parallel and facing each other.

12. The angle between the incident ray and the reflected ray is 60°. What is the value of the angle of incidence?

Answer is 30°.

The angle of reflection is equal to the angle of incidence. Since Angle of incident ray+ Angle of reflected ray is 60°.

The angle of incidence = 30°

13. The distance between the object and its image formed by a plane mirror appears to be 24 cm. What is the distance between the mirror and the object?

The distance will be 12 cm

Object +image formed =24 cm

Object +mirror =12 cm

Short Answer Questions

14. What happens to light when it gets dispersed? Give an example.

When the light gets dispersed it is split into its constituent colours. Ex: rainbow.

15. Draw Fig.16.6 showing the position of the plane mirror. Also, label the angle of incidence and angle of reflection on it.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 6

16. Look at Fig.16.7. Can the image of the child in it be obtained on a screen?

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 8

No, the image of the child cannot be obtained on a screen because the image is a virtual image.

17. Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

They can see objects even in the faint light. As a large pupil and large cornea allow more light to enter their eyes.

18. What kind of lens is there in our eyes? Where does it form the image of an object?

Our eyes have a convex type of lens and the image is formed on the retina.

19. Which part of the eye gets affected if someone is suffering from cataract? How is it treated?

If a person is suffering from cataract their eye lens will be cloudy. Cataract can be treated by replacing the opaque lens by an artificial lens.

Long Answer Questions

20. Boojho planned activity to observe an object A through pipes as shown in Fig. 16.8, so that he could see objects which he could not directly see.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 9

(a) How many mirrors should he use to see the objects?

(b) Indicate the positions of the mirrors in the figure.

(c) What must be the angle with respect to the incident light at which he should place the mirrors?

(d) Indicate the direction of the rays in the figure.

(e) If any of the mirrors are removed, will he be able to see the objects?

a) Three mirrors should he use to see the objects.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 10

e) He will not be able to see the objects.

21. There is a mistake in each of the following ray diagrams given as Fig. 16.9 a, b, and c. Make the necessary correction (s).

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 12

The Fig. in all the three cases after correction should be as in the given figure

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 13

22. Explain the process which enables us to perceive motion in a cartoon film.

Carton movie is actually a projection of a static picture. 24 pictures per second are shown in a specific order which gives us the perception of movement.

23. How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?

The kaleidoscope gives a number of images formed by reflection from the mirrors inclined to one another. Designers and artists use kaleidoscope to get ideas for new patterns to design wallpapers, Jewellery and fabrics.

24. Fig. 16.10 shows the word REST written in two ways in front of a mirror. Show how the word would appear in the mirror.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 14

25. Write down the names of parts of the eye in the blank spaces shown in Fig. 16.10.

NCERT Exemplar Class 8 Science chapter 16 Solutions fig 16

1. Ciliary muscle

6. Optic Nerve

The Important Topics of the NCERT Exemplar for Class 8 Science Chapter 16 Light

  • What Makes Things Visible
  • Laws of Reflection
  • Regular and Diffused Reflection
  • Reflected Light Can be Reflected Again
  • Multiple Images
  • Sunlight – White or Coloured
  • What Is Inside Our Eyes
  • Care of the Eyes
  • Visually Challenged Persons Can Read and Write
  • What Is the Braille System?

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Frequently Asked Questions on NCERT Exemplar Solutions for Class 8 Science Chapter 16

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MCQ Questions for Class 8 Science Chapter 16 Light with Answers

MCQ Questions for Class 8 Science Chapter 16 Light with Answers

We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 16 Light with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Light Class 8 MCQs Questions with Answers here along with a detailed explanation.

Light Class 8 MCQs Questions with Answers

Choose the correct option.

Question 1. We are able to see an object due to the presence of (a) light (b) dark (c) refraction (d) object

Answer: (a) light

Light with Answers

Question 2. The bouncing back of light into the same medium is called (a) refraction (b) reflection (c) dispersion (d) diffraction

Answer: (b) reflection

Light Questions with Answers

Question 3. A mirror has _____ surface. (a) rough (b) polished (c) dark (d) all of these

Answer: (a) rough

Question 4. Maximum part of light is reflected by (a) opaque object (b) translucent object (c) transparent object (d) all of these

Answer: (a) opaque object

Question 5. Beam of light striking the reflecting surface is called (a) incident ray (b) reflected ray (c) refracted ray (d) normal ray

Answer: (b) reflected ray

Question 6. The back side of a plane mirror contains (a) gold coating (b) silver coating (c) aluminium coating (d) copper coating

Answer: (b) silver coating

Question 7. The perpendicular drawn to the reflecting surface is called (a) normal (b) incident ray (c) reflected ray (d) none of these

Answer: (a) normal

Question 8. There are ________ laws of reflection. (a) one (b) two (c) three (d) four

Answer: (b) two

Question 9. The angle of incidence is always _______ to the angle of reflection. (a) greater (b) smaller (c) equal (d) none of these

Answer: (c) equal

Question 10. The angle between the reflected ray and the normal is called (a) angle of incidence (b) reflected ray (c) angle of reflection (d) point of incidence

Answer: (c) angle of reflection

Question 11. The reflection of light from a smooth surface is called (a) diffused reflection (b) regular reflection (c) dispersion (d) spectrum

Answer: (b) regular reflection

Question 12. Which of the following results in diffused reflection? (a) Plane mirror (b) Shiny surface (c) Silver (d) Wood

Answer: (d) Wood

Question 13. The nature of image formed by plane mirror is (a) real and inverted (b) virtual and erect (c) real and erect (d) virtual and inverted

Answer: (b) virtual and erect

Question 14. If you hold a pen in your right hand and stand in front of the mirror, the pen will be in the left hand in the image. This phenomenon is called (a) lateral inversion (b) diffraction (c) reflection (d) inversion

Answer: (a) lateral inversion

Question 15. If two plane mirrors are inclined at an angle of 40°, number of images formed will be (a) 7 (b) 8 (c) 9 (d) 5

Answer: (b) 8

Question 16. Type of mirror used as side view mirror is (a) convex mirror (b) plane mirror (c) concave mirror (d) ground mirror

Answer: (a) convex mirror

Question 17. Band of seven colours is called (a) VIBGYOR (b) dispersion (c) spectrum (d) reflection

Answer: (c) spectrum

Question 18. Front bulged part of the eyeball is called (a) cornea (b) iris (c) retina (d) pupil

Answer: (a) cornea

Question 19. Two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be (a) 25° (b) 50° (c) 65° (d) 115°

Answer: (c) 65°

Question 20. Visually impaired people can read and write using (a) electronic writer (b) Braille system (c) digital pens (d) hearing aids

Answer: (b) Braille system

Question 21. A toy is placed at 10 cm in front of a plane mirror. What is the distance of image from the mirror? (a) 20 cm (b) 40 cm (c) 10 cm (d) 30 cm

Answer: (c) 10 cm

Question 22. A candle is 30 cm high. What is the height of its image in a plane mirror? (a) 10 cm (b) 15 cm (c) 30 cm (d) 45 cm

Answer: (c) 30 cm

Question 23. Which of the following works on the concept of multiple reflections? (a) Telescope (b) Binoculars (c) Kaleidoscope (d) Sunglasses

Answer: (c) Kaleidoscope

Question 24. Visually challenged people can read and write with (a) hearing aid (b) electronic type writer (c) Braille system (d) digital pen

Answer: (c) Braille system

Question 25. The human eye can clearly see up to which distance? (a) Infinity (b) 1000 km (c) 100 km (d) 10 km

Answer: (a) Infinity

Question 26. The human eye cannot see clearly at a distance which is less than (a) 2.5 cm (b) 25 cm (c) 15 cm (d) 1.5 cm

Answer: (b) 25 cm

Question 27. The angle between the incident ray and the normal is called angle of (a) reflection (b) refraction (c) transmission (d) incidence

Answer: (d) incidence

Question 28. Which of the following parts of an eye controls the amount of light entering the eye by contracting or dilating? (a) Retina (b) Cornea (c) Pupil (d) Iris

Answer: (d) Iris

Question 29. The phenomenon of breaking up of white light into its seven constituent colours is called (a) reflection of light (b) refraction of light (c) dispersion of light (d) radiation of light

Answer: (c) dispersion of light

Question 30. We can see ourselves in a mirror or a polished surface but not on walls because of (a) regular reflection (b) normal reflection (c) irregular reflection (d) specular reflection

Answer: (c) irregular reflection

Question 31. How many cells are there in a Braille character? (a) 12 (b) 9 (c) 3 (d) 6

Answer: (d) 6

Question 32. Which of the following will produce a regular reflection? (a) Tree leaf (b) Wood (c) Wall (d) Mirror

Answer: (d) Mirror

Question 33. An instrument which enables us to see things which are too small to be seen with naked eye is called (a) microscope (b) periscope (c) kaleidoscope (d) none of these

Answer: (a) microscope

Question 34. The property of a plane mirror to make ‘right appear as left’ and vice versa, is called (a) vertical inversion (b) lateral inversion (c) reflection (d) refraction

Answer: (b) lateral inversion

Fill in the blanks with suitable word/s.

Question 1. Light is a form of __________

Answer: energy

Question 2. The ray of light which strikes the reflecting surface is called __________ ray.

Answer: incident

Question 3. The bouncing back of light after it falls on a surface is called __________

Answer: reflection

Question 4. A mirror has _________ and _________ surface.

Answer: smooth, polished

Question 5. __________ is the perpendicular line on the incidence point.

Answer: Normal

Question 6. A plane mirror forms a _________ image.

Answer: virtual

Question 7. The ray which returns after striking the surface is called __________ ray.

Answer: reflected

Question 8. Angle of incidence is always __________ to the angle of reflection.

Answer: equal

Question 9. Reflection from a smooth surface is called __________ reflection.

Answer: regular

Question 10. The size of image formed by the plane mirror is __________ as size of object.

Answer: same

Question 11. Splitting of light into seven colours is called __________

Answer: dispersion

Question 12. Kaleidoscope is based on the concepts of __________

Answer: multiple reflection

Question 13. The point on the surface at which incident ray strikes is called __________

Answer: point of incidence

Question 14. The reflection of light from an uneven surface is called __________

Answer: diffused reflection

Question 15. Paper is a _________ surface.

Answer: rough

Question 16. Mirror is a __________ surface.

Answer: smooth

Question 17. When the mirrors are inclined at 900, we get images.

Answer: three

Question 18. In bright light, the size of pupil __________

Answer: decreases

Question 19. The space between the cornea and lens is filled with a liquid called __________

Answer: aqueous humour

Question 20. Braille system was invented by __________

Answer: Louis Braille

Question 21. The image formed by a plane mirror is ………………….. inverted.

Answer: laterally

Question 22. The angle of incidence is always equal to the angle of …………………..

Question 23. ………………….. formation is the natural phenomenon showing dispersion.

Answer: Rainbow

Question 24. The lens of the eye focuses light on …………………..

Answer: retina

Question 25. The size of the pupil becomes ………………….. when we see in dim light.

Answer: large

True or False

Question 1. Deficiency of vitamin B causes night blindness.

Answer: False

Question 2. In the Braille system, patterns are made with coloured dots.

Question 3. Normal make 60° angle with the reflecting surface.

Question 4. Angle of incidence is always equal to angle of reflection.

Answer: True

Question 5. Diffused reflection occurs due to rough surface.

Question 6. Kaleidoscope is based on the principle of dispersion of light.

Question 7. Both incident ray and reflected ray lie in the same plane.

Question 8. The choroid prevents the internal reflection of light and protects the light sensitive inner parts of the eye.

Question 9. Rainbow forms due to dispersion.

Question 10. Rods are sensitive to bright light.

Question 11. The iris is the coloured part of the eye.

Question 12. Diffused reflection is due to the failure of laws of reflection.

Question 13. Ciliary muscles changes the shape of the lens in the eye.

Question 14. We should not wash our eyes.

Question 15. Braille was designed by Louis Braille.

Question 16. Cones are sensitive to dark light.

Question 17. Too much light is good for eyes.

Question 18. The size of the pupil becomes large when we see in dim light.

Question 19. The angle of incidence is not equal to the angle of reflection in irregular reflection.

Question 20. The angle between the normal and the incident rays is called the angle of incidence.

Match the following

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Case Study Questions for Class 7 Science Chapter 15 Light

[download] case study questions for class 7 science chapter 15 light.

Here we are providing case study or passage-based questions for class 7 science chapter 15 Light .

Case Study/Passage Based Questions

Lenses are transparent and light can pass through them. Lenses are classified as convex lens and concave lens and we can distinguish between these two types of lenses by just touching them. Lenses are widely used in various appliances that we come across in our daily life. 1. The lenses used in spectacles of a person are found to the thick in the middle but thinner at the edges. The lens used are (a) convex (b) concave (c) plane (d) none of these 2. The image formed by a lens is always erect, virtual and smaller in size than the object. The lens is (a) convex (b) concave (c) plane (d) none of these 3. The image formed by magnifying glass is (a) real (b) virtual (c) either real (d) none of these is or virtual correct

Related Posts

What is case study question for class 7 science.

Case study or passage-based questions in class 7 Science typically require students to read a given scenario or passage and answer questions based on the information provided. These questions assess students’ comprehension, analytical thinking, and application of scientific concepts. 

Best Ways to Prepare for Case Study Questions

To develop a strong command on class 6 Science case study questions, you can follow these steps:

  • Read the textbook and study materials:  Familiarize yourself with the concepts and topics covered in your class 6 Science curriculum. Read the textbook thoroughly and take notes on important information.
  • Practice analyzing case studies:  Look for case studies or passages related to class 6 Science topics. Analyze the given information, identify key details, and understand the context of the situation.
  • Develop comprehension skills:  Focus on improving your reading comprehension skills. Practice reading passages or articles and try to summarize the main points or extract relevant information. Pay attention to details, vocabulary, and the overall structure of the passage.
  • Understand scientific concepts:  Ensure that you have a solid understanding of the scientific concepts discussed in class. Review the fundamental principles and theories related to each topic.
  • Make connections:  Try to connect the information provided in the case study to the concepts you have learned in class. Identify any cause-effect relationships, patterns, or relevant scientific principles that apply to the situation.
  • Practice critical thinking:  Develop your critical thinking skills by analyzing and evaluating the information given in the case study. Think logically, consider multiple perspectives, and draw conclusions based on the evidence provided.
  • Solve practice questions:  Look for practice questions or sample case study questions specifically designed for class 6 Science. Solve these questions to apply your knowledge, practice your analytical skills, and familiarize yourself with the format of case study questions.
  • Seek clarification:  If you come across any challenging concepts or have doubts, don’t hesitate to ask your teacher for clarification. Understanding the underlying principles will help you tackle case study questions effectively.

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Class 6 Science Chapter 8 Case Based Questions - Light, Shadow and Reflections

Sarah is conducting an experiment with different objects to understand the properties of light. She has a wooden box, a glass pane, and a candle. She is using a source of light to observe the behavior of these objects.

Q1: What type of object is the wooden box in this scenario, and why? Ans: The wooden box is an opaque object because it does not allow light to pass through it. Q2: If Sarah observes that she can see through the glass pane clearly, what type of object is it, and why? Ans: The glass pane is a transparent object because it allows light to pass through it clearly. Q3: How does the behavior of the candle differ from the wooden box and the glass pane in terms of emitting light? Ans:   The candle is a luminous object because it emits its own light. Q4: Which of the following objects is an example of a translucent object? (a)  Wooden box (b)  Glass pane (c) Candle Ans:   (b) Q5: What is the primary characteristic that distinguishes a luminous object from a non-luminous object? (a) Color (b) Shape (c) Ability to emit light Ans: (c)

Mark is using a pinhole camera to capture images. He is experimenting with the camera's focus and understanding the principles behind it.

Q6: Explain how the image formed by Mark's pinhole camera is different from the actual object in terms of size and orientation. Ans:   The image formed by Mark's pinhole camera is inverted and smaller in size compared to the actual object. Q7: Describe the steps Mark should follow to make a pinhole camera. Ans: Steps to make a pinhole camera:

  • Take two rectangular boxes that fit into one another without any gap.
  • Cut open one side of each box.
  • Make a small hole in the larger box at the center of the closed end opposite the side that has been cut open.
  • Cut a square of side five centimeters in the smaller box in the closed end opposite the side that has been cut open.
  • Cover this square with tracing paper.
  • Slide the smaller box into the larger box, ensuring that the pinhole and the tracing paper are in line with one another but at opposite ends.
  • Slide the smaller box to adjust the focus.

Q8: Why is it mentioned that "the image is not clear" in the context of a pinhole camera? Ans:   The image is not clear because the pinhole camera uses a small hole to form the image, resulting in limited light and reduced clarity. Q9: What is the principle on which a pinhole camera works? (a) The principle of reflection of light. (b)  The principle of refraction of light. (c)  The principle of straight-line propagation of light. Ans:   (c) Q10: Which type of surface reflects the entire light incident on it? (a) Transparent surface (b)  Opaque surface (c) Plane mirror surface Ans: (c)

A group of students is discussing the difference between shadows and images. They are using a mirror and a flashlight to observe and learn about these phenomena.

Q11: Explain the similarities and differences between shadows and images. Ans: Similarities:

  • Both shadows and images require a source of light.
  • They are formed when light interacts with objects.

Differences:

  • Shadows are black and have no color, while images can be colorful.
  • Shadows change in length with the position of the sun, while images in a mirror remain the same size.

Q12: Describe the setup and conditions required to observe a shadow and an image. Ans:   To observe a shadow, you need a source of light, an opaque object, and a screen. To observe an image in a mirror, you need a reflective surface and an object in front of it. Q13: Why do shadows change in length throughout the day, while images in a mirror do not? Ans: Shadows change in length throughout the day because of the changing angle and position of the sun. Images in a mirror do not change size. Q14: Which of the following statements is true regarding shadows and images? (a)  Shadows are always colorful. (b) Images change in size with the position of the sun. (c)  Shadows can be seen without the need for a screen. Ans: (c) Q15: What is the main reason behind the formation of shadows? (a) Reflection of light (b) Bending of light (c) Blocking of light Ans: (b)

A group of students is visiting an observatory, where they encounter a two-way mirror. They are curious about its functionality.

Q16: Explain how a two-way mirror works and its practical applications. Ans: A two-way mirror, also known as a one-way mirror, allows one side to act as a mirror (reflective) and the other side as plain glass (transparent). It is used for observing people without them knowing, such as in police stations or psychological institutions. Q17: Compare and contrast the behavior of a two-way mirror with a regular plane mirror. Ans:   Comparison with a regular plane mirror:

  • A plane mirror is always reflective, whereas a two-way mirror can switch between reflective and transparent properties.

Q18: In what situations might a two-way mirror be used for observation without detection? Ans:   A two-way mirror might be used for covert observation without detection. Q19: A two-way mirror acts as: (a)  A transparent medium (b)  A translucent medium (c) A combination of a mirror and plain glass Ans: (c) Q20: What type of surface is a smooth plane mirror? (a) Transparent surface (b) Opaque surface (c)  Reflective surface Ans:   (c)

Tom is studying the concept of reflection and its importance in our daily lives. He is experimenting with various reflective surfaces.

Q21: Explain the concept of reflection of light and how it plays a role in forming images. Ans:   The concept of reflection of light involves the bouncing back of light when it encounters a smooth shiny surface. Reflection plays a role in forming images by redirecting light rays. Q22: Describe the behavior of light when it is incident on a smooth shiny surface. Ans:   When light is incident on a smooth shiny surface, it reflects back into the same medium following the laws of reflection. Q23: Provide examples of everyday situations where reflection of light is essential. Ans:   Examples of everyday situations with reflection of light: Mirrors, shiny metal surfaces, glass windows, and still water surfaces. Q24: Which term best describes the likeness of an object carried and formed by light in a mirror? (a) Image (b) Shadow (c) Reflection Ans:   (a) Q25: What is the primary characteristic that distinguishes a plane mirror from other reflective surfaces? (a) Color (b)  Smoothness (c)  Size of reflection Ans: (b)

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  1. Light Class 8 Extra Questions Science Chapter 16

    Question 1. Why fingers appear blurred when we move our hand very fast in front of our eyes? Answer: This is due to persistence of vision l/16th of a second. Question 2. What makes things visible? Answer: When light reaches our eyes after striking an object, we are able to see an object. Question 3.

  2. Important Questions Class 8 Science Chapter 16

    How can an owl see only at night but not during daylight? What is the braille system? And other such questions. In this chapter, you will also study the human eye and the construction of the human eye. Students will also learn fun experiments for explaining reflections, such as how to build a kaleidoscope.

  3. CBSE Class 8 Science Light Competency Based Questions

    10 Strengthen your understanding of Light in CBSE Class 8 Science through competency based questions. Acquire in-depth knowledge and improve problem-solving abilities with comprehensive solutions.

  4. Class 8 Science Case Study Question

    We are always ready to help You. CBSE Class 8 Science Case Study Question Chapter 1 Crop Production and Management Case Study Question Chapter 2 Microorganisms: Friend and Foe Case Study Question Chapter 3 Synthetic Fibres and Plastics Case Study Question Chapter 4 Materials: Metals and Non-Metals Case Study Question

  5. Light Class 8 Science Extra Questions and Answers

    Question 1: Name a device which works on the reflection of reflected light. Answer: Periscope Question 2: Name the point inside the human eye where no vision is possible. Answer: Blind spot Question 3: Name an eye disease caused by the deficiency of vitamin A in the diet. Answer: Night blindness

  6. Light Class 8 Important Questions and Answers

    Here we have covered Important Questions on Light for Class 8 Science subject. Very Short Answer Questions 1. What makes things visible? Answer: Light. 2. Can you see an object in the dark? Answer: No. 3. What is mirror? Answer: A smooth and shiny surface is called a mirror. 4. What kind of image is formed by a plane mirror?

  7. NCERT Exemplar Class 8 Science Chapter 16 Light

    Question 1 Part of the eye which controls the entering of light is called (a) iris (b) cornea (c) lens (d) retina Answer. (a) Iris is a dark muscular structure behind the cornea, which controls the amount of light entering into the eye. Question 2 We can see a non-luminous object when the light (a) emitted by the object falls on the eye

  8. NCERT Solutions for Class 8 Science Chapter 16 Light

    Answer: No, diffuse reflection doesn't mean the failure of laws of reflection. Question 3. Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. Polished wooden table Chalk powder Cardboard surface Marble floor with water spread over it Mirror

  9. Class 8 Important Questions for Science

    (a) iris (b) cornea (c) lens (d) retina We can see a non-luminous object when light: (a) emitted by the object falls on the eye. (b) is reflected from the object towards our eye. (c) completely passes through the object. (d) gets completely absorbed by the object. Light is falling on surface S 1, S 2, S 3 as shown in Fig.16.1.

  10. Light Class 8

    It has everything you will need. Check out the NCERT Solutions, Notes, Experiments, Activities and some Extra Questions for Chapter 16 Class 8 Science - Light.Everything is provided free of cost, and is the best education material available for Light Class 8.In this chapter, we will study -How do weseeobjects?What arevisible and in.

  11. Category: Case Study Questions for Class 8 Science

    August 1, 2023 Physics Gurukul Leave a Comment Case Study Questions for Class 8 Science Chapter 1 Crop Production and Management Editable Study Materials for Your Institute - CBSE, ICSE, State Boards (Maharashtra & Karnataka), JEE, NEET, FOUNDATION, OLYMPIADS, PPTs

  12. NCERT Solutions for Class 8 Science Chapter 16 Light

    1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain. Soln: If a person is inside a room where there is no light, it is then impossible to see the object inside the room, but the object outside the room can be seen easily.

  13. NCERT Solutions for Class 8 Science Chapter 16 Light

    Chapter 16 Light NCERT Solutions for Class 8 Science - Notes. • Light is a form of energy, which induces the sensation of vision in our eyes and makes us able to see various things present in our surrounding. • After striking the mirror, the ray of light is reflected in another direction. The light ray, which strikes any surface, is called ...

  14. Chapter 16 Light Class 8 Notes

    The white layer of the eye that covers most of the outside of the eyeball is called the Sclera. In the Class 8 Science Chapter 16 Light Notes, various terminologies related to light, the laws of reflection and the structure of the human eye is discussed along with the chapter questions.

  15. light class 8 notes CBSE

    Light class 8 notes. On this page, you will find notes, questions, and answers to class 8 science chapter 16 Light. These Light class 8 notes, explanations, examples, and questions and answers are according to CBSE and the NCERT textbook. If you like the study material, feel free to share the link as much as possible.

  16. Important Questions for CBSE Class 8 Science Chapter 16

    The study material provided here is important questions class 8 science chapter 16 Pdf is prepared by the experts according to the prescribed syllabus. It includes MCQ types of questions, diagram-oriented questions, short and long answer questions, along with class 8 science ch 16 extra questions.

  17. CBSE 8th Standard CBSE all Case study Questions Updated

    CBSE 8th Standard CBSE all Case study Questions Updated CBSE 8th Standard CBSE all question papers, important notes , study materials , Previuous Year questions, Syllabus and exam patterns. Free 8th Standard CBSE all books and syllabus online. Practice Online test for free in QB365 Study Material.

  18. NCERT Solutions for Class 8 Science Chapter 16 Light

    NCERT Solutions for Class 8 Science Chapter 16 Light are given below. Here we have provided the best and error-free answers to all the exercise questions that will strengthen your foundation in science. Solving NCERT questions will assist you in grasping the content in the Crop Production and Management chapter in a better way.

  19. CBSE Class 8 Science Important Questions 2023-24

    Significance of CBSE Class 8 Science Important Questions with Answers PDF. There are 18 chapters included in the Class 8 Science syllabus that covers vivid topics related to pollution, astronomy, light, natural phenomena, sound, force, friction, etc. These chapters need the highest attention from the students to complete preparing the syllabus.

  20. NCERT Exemplar Class 8 Science Solutions Chapter 16

    NCERT Exemplar Solutions Class 8 Science Chapter 16 - Free PDF Download. The NCERT Exemplar Solution for Class 8 Science Chapter 16 Light provides you with details on the types and the level of difficulty of questions that are usually asked in the CBSE Class 8 examination and other competitive examinations. Hence, it is important for students to refer to the NCERT Exemplar Solution.

  21. MCQ Questions for Class 8 Science Chapter 16 Light with Answers

    4. Normal vision. (b) 25 cm to infinity. 5. Braille system. (a) Visually challenged. Hope the information shed above regarding NCERT MCQ Questions for Class 8 Science Chapter 16 Light with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 8 Science Light MCQs Multiple Choice Questions with ...

  22. Case Study Questions for Class 7 Science Chapter 15 Light

    Passage-1 Lenses are transparent and light can pass through them. Lenses are classified as convex lens and concave lens and we can distinguish between these two types of lenses by just touching them. Lenses are widely used in various appliances that we come across in our daily life. 1.

  23. Class 6 Science Chapter 8 Case Based Questions

    The Case Based Questions: Light, Shadows & Reflections is an invaluable resource that delves deep into the core of the Class 6 exam. These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.