Light, Shadows And Reflections Worksheet

Objective Type Questions

1. Match the following:
   
   
   State whether the statement is true or false: 
2. Shadows are formed when a translucent object comes in the path of light.
   
   Find odd one out.
3. Butter paper, reading glass, wooden plank, curtain.
   
   State whether the statement is true or false: 
4. Shadows can be formed without a source of light.
   
   
5. Unscramble the following words: 
   (a) LMINUOISN
   (b) IRRMOR
   (c) TENSPTRAAR
   
   Multiple Choice Questions
   
   
6. The image shows three objects, which of the following will have ability to emit light?
   i. 
   
   ii. 
   
   iii. 
   
   iv. 
   
   Choose the correct option among the following.
   (a) Both ii and iii
   (b) Both i and ii
   (c) Both ii and iv
   (d) Both i and iv
   
   
7. How can you determine if an object is opaque or translucent based on its shadow?
   (a) By observing the shape of shadow cased but object.
   (b) By observing how sharp or blurry its shadow is.
   (c) By observing if it creates multiple shadows.
   (d) By observing if it reflects any light.
   
   
8. Rajiv made a pinhole camera with cardboard box and got a clear image of light bulb.
   
   
   Where does the image of the light bulb in the pinhole camera form?
   (a) at the pinhole
   (b) at the translucent screen
   (c) Somewhere between translucent screen and pinhole
   (d) on the upper surface of the outer box
   
   
9. Hitesh is making a pinhole camera for his science project. He wants to know how he can make the image formed by his pinhole camera sharper. Which of the following factors should Hitesh consider?
   i. The distance between the object and the pinhole
   ii. The size of the pinhole
   iii. The distance between the pinhole and the screen
   
   Choose the correct option among the following. 
   (a) Only i is correct.
   (b) Only ii is correct.
   (c) Both i and iii are correct.
   (d) All i, ii and iii are correct.
   
   Subjective Questions
   
   
10. If two identical objects are placed 5 cm and 10 cm away from a light source, respectively, how do their shadows compare on a screen behind them? Which of the following object will have larger shadow.
    
    
    
11. Krishna is explaining to his friend how a pinhole camera works. Can you draw a diagram to help him explain it? Use candle as an object and explain the working of a pinhole camera.
    
    
12. Can a shadow be formed by a luminous object in a dark room? Justify your answer.
    
    
13. Simran placed a candle in front of a plane mirror on her dressing table at night.
    
    What can we learn about the image formedby the plane mirror from this situation? 
    
    
14. Vinit observes the lighted bulb through the pinhole camera as shown below.
     
    How and where does the image of the bulb appear inside the camera?
    
    
15. What are some examples of objects that can create shadows but not reflections, and vice versa?
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
    
    
    
16. Assertion: The image formed by a pinhole camera is always black and white.
    Reason: The pinhole camera only allows a small amount of light to enter, resulting in a black and white image with low contrast.
    
    
17. Assertion: The shadow of an airplane flying at a higher altitude is less distinct than the shadow of a bird flying nearer to the ground.
    Reason:  The airplane is farther away from the sun than the bird.
    
    
18. Assertion: Shadows can be seen on any surface, while reflections can only be seen on smooth surfaces.
    Reason: Shadows are formed by the blocking of light, while reflections are formed by the bouncing of light.
    
    
19. Assertion: During a lunar eclipse, the Earth blocks the light from the Sun, casting a shadow on the Moon.
    Reason: Shadow is formed when a large, opaque object blocks the light source.
    
    Case-Based Questions
    
    
20. At a science class, Rohan and his classmates were learning about how light travels. Their teacher set up an experiment by fixing a lighted candle on a table and giving each student a rubber tube. The students were instructed to stretch the rubber tube straight and look through it at the flame of the candle with one eye while keeping the other eye closed.
    
    They found that when the rubber tube was straight, they could see the light of the candle flame through it. Then, the teacher asked them to bend the rubber tube a little and look through it at the candle flame again. This time, they could not see the light of the candle flame through the bent rubber tube. 
    
    Answer the following question based on the above observation.
    i. What did Rohan and his classmates observe when they looked through a straight rubber tube at the candle flame?
    ii. What did Rohan and his classmates observe when they looked through a bent rubber tube at the candle flame?
    iii. What conclusion did Rohan and his classmates draw from their observations?
    iv. What was the purpose of the experiment with the lighted candle and rubber tube?

Objective Type Questions

1. Match the following:
   
   
   Solutions:
   
   
   State whether the statement is true or false: 
2. Shadows are formed when a translucent object comes in the path of light.
   
   Solutions: Correct answer: False.
   Shadows are formed when an opaque object comes in the path of light.
   
   Find odd one out.
3. Butter paper, reading glass, wooden plank, curtain.
   
   Solutions: Correct answer:  reading glass.
   The odd one out is reading glass because it is the only one that is transparent and allows clear visibility through it, while the other three are opaque or translucent and do not allow clear visibility.
   
   State whether the statement is true or false: 
4. Shadows can be formed without a source of light.
   
   Solutions: Correct answer:  False
   Shadow cannot be formed without a source of light.
   
   
5. Unscramble the following words: 
   (a) LMINUOISN
   (b) IRRMOR
   (c) TENSPTRAAR
   
   Solutions: Correct answer:
   (a) LUMINOUS
   (b) MIRROR
   (c) TRANSPARENT
   
   Multiple Choice Questions
   
   
6. The image shows three objects, which of the following will have ability to emit light?
   i. 
   
   ii. 
   
   iii. 
   
   iv. 
   
   Choose the correct option among the following.
   (a) Both ii and iii
   (b) Both i and ii
   (c) Both ii and iv
   (d) Both i and iv
   
   Correct option: (d) Both i and iv
   Solutions:
   From the given figure we can conclude that both bulb and a diya or lamp can produce light whereas other two are nonluminous objects.
   
   
7. How can you determine if an object is opaque or translucent based on its shadow?
   (a) By observing the shape of shadow cased but object.
   (b) By observing how sharp or blurry its shadow is.
   (c) By observing if it creates multiple shadows.
   (d) By observing if it reflects any light.
   
   Correct option: (b)By observing how sharp or blurry its shadow is.
   Solution:
   You can determine if an object is opaque or translucent based on its shadow by observing how sharp or blurry the shadow is.
   
   
8. Rajiv made a pinhole camera with cardboard box and got a clear image of light bulb.
   
   
   Where does the image of the light bulb in the pinhole camera form?
   (a) at the pinhole
   (b) at the translucent screen
   (c) Somewhere between translucent screen and pinhole
   (d) on the upper surface of the outer box
   
   Correct option: (c)
   Solution:
   In a pinhole camera, the image is formed on a translucent screen that is placed opposite to the pinhole.
   
   Light from the object (in this case, the light bulb or tree) passes through the pinhole and projects an inverted image of the object on the translucent screen.
   
   
9. Hitesh is making a pinhole camera for his science project. He wants to know how he can make the image formed by his pinhole camera sharper. Which of the following factors should Hitesh consider?
   i.The distance between the object and the pinhole
   ii.The size of the pinhole
   iii.The distance between the pinhole and the screen
   
   Choose the correct option among the following. 
   (a) Only i is correct.
   (b) Only ii is correct.
   (c) Both i and iii are correct.
   (d) All i, ii and iii are correct.
   
   Correct option: (d) All i, ii and iii are correct.
   Solution:
   For the given case, these are the following factors which can affect the sharpness of the image formed by a pinhole camera
   • the distance between the object and the pinhole.
   • the size of the pinhole.
   • the distance between the pinhole and the screen.
   
   Here,
   D = distance between the object and the pinhole
   F = the distance between the pinhole and the screen.
   
   
   Subjective Questions
   
   
10. If two identical objects are placed 5 cm and 10 cm away from a light source, respectively, how do their shadows compare on a screen behind them? Which of the following object will have larger shadow.
    
    
    Solution:
    The size of a shadow depends on the distance between the object and the light source as well as the distance between the object and the screen on which the shadow is being cast. In the given case, the object 1 that is closer to the light source (5 cm away) will cast a larger shadow on the screen behind it than the object that is farther away (10 cm away) from the light source.
    i.e., The closer to the light source an object is, the bigger the shadow will be.
    
    
11. Krishna is explaining to his friend how a pinhole camera works. Can you draw a diagram to help him explain it? Use candle as an object and explain the working of a pinhole camera.
    
    Solution:
    A pinhole camera works by allowing light to enter through a small hole (the pinhole) and project an inverted image on the opposite side of the box. In this case, the object is a candle and its light passes through the pinhole to form an inverted image of the candle on the other side.
    
    The image is upside down because light travels in straight lines and the light from the top of the candle passes through the pinhole and hits the bottom of the box, while the light from the bottom of the candle passes through the pinhole and hits the top of the box. This creates an inverted image of the candle.
    
    
12. Can a shadow be formed by a luminous object in a dark room? Justify your answer.
    
    Solution:
    A shadow cannot be formed by a luminous object, even in a dark room, because a shadow is formed when an opaque object blocks the path of light and a luminous object cannot block its own light. Instead, the luminous object can cast shadows of other objects when its light is blocked by them.
    
    
13. Simran placed a candle in front of a plane mirror on her dressing table at night.
    
    What can we learn about the image formedby the plane mirror from this situation? 
    
    Solution:
    From the given case, we can conclude that the image formed by the plane mirror is clear, upright, and of the same size as the candle.
    
    
14. Vinit observes the lighted bulb through the pinhole camera as shown below.
     
    How and where does the image of the bulb appear inside the camera?
    
    Solution:
    In a pinhole camera, the image is formed on a translucent screen that is placed opposite to the pinhole. Light from the object (in this case, the light bulb) passes through the pinhole and projects an inverted (upside down) image of the object on the translucent screen.
    
    
15. What are some examples of objects that can create shadows but not reflections, and vice versa?
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
    
    
    Solution:
    Example of objects that can create shadows but not reflections: Opaque objects such as a book, a pencil, or a person.
    • Light cannot pass through these objects, so they block the light and create a shadow on the opposite side.
    Example of objects that can create reflections but not shadows: Transparent or translucent objects such as a glass of water, a plastic bottle, or a soap bubble.
    • Light can pass through these objects, so they do not block the light and instead reflect it back to the viewer.
    • Mirrors are another example of an object that can create reflections but not shadows, as they reflect light rather than blocking it.
    
    
16. Assertion: The image formed by a pinhole camera is always black and white.
    Reason: The pinhole camera only allows a small amount of light to enter, resulting in a black and white image with low contrast.
    
    Correct option: (d) A is false, but R is true.
    Solution:
    The image formed by a pinhole camera is of same colour as object, but it may appear dimmer due to the limited amount of light entering through the pinhole.
    
    
17. Assertion: The shadow of an airplane flying at a higher altitude is less distinct than the shadow of a bird flying nearer to the ground.
    Reason:  The airplane is farther away from the sun than the bird.
    
    Correct option: (c) A is true, but R is false.
    Solution:
    When they are flying high in the sky, a bird or an aeroplane do not cast a shadow on the ground as the shadow gets smaller with growing distance. They can only cast a shadow if they are at a low height, or close to the ground.
    
    
18. Assertion: Shadows can be seen on any surface, while reflections can only be seen on smooth surfaces.
    Reason: Shadows are formed by the blocking of light, while reflections are formed by the bouncing of light.
    
    Correct option: (b) Both A and R are true, but R is not the correct explanation of the assertion.
    Solution:
    Shadows can be seen on any surface because they are formed when an opaque object blocks light, while reflections can only be seen on smooth surfaces because they are formed when light bounces off a surface. Both the assertion and reason are true, but the reason does not explain the difference between shadows and reflections.
    
    
19. Assertion: During a lunar eclipse, the Earth blocks the light from the Sun, casting a shadow on the Moon.
    Reason: Shadow is formed when a large, opaque object blocks the light source.
    
    Correct option: (a) Both A and R are true, and R is the correct explanation of the assertion.
    Solution:
    During a lunar eclipse, the Earth comes between the Sun and the Moon and blocks the light from the Sun, casting a shadow on the Moon. This is an example of how a shadow is formed when a large, opaque object blocks the light source.
    
    Case-Based Questions
    
    
20. At a science class, Rohan and his classmates were learning about how light travels. Their teacher set up an experiment by fixing a lighted candle on a table and giving each student a rubber tube. The students were instructed to stretch the rubber tube straight and look through it at the flame of the candle with one eye while keeping the other eye closed.
    
    They found that when the rubber tube was straight, they could see the light of the candle flame through it. Then, the teacher asked them to bend the rubber tube a little and look through it at the candle flame again. This time, they could not see the light of the candle flame through the bent rubber tube. 
    
    Answer the following question based on the above observation.
    i. What did Rohan and his classmates observe when they looked through a straight rubber tube at the candle flame?
    ii. What did Rohan and his classmates observe when they looked through a bent rubber tube at the candle flame?
    iii. What conclusion did Rohan and his classmates draw from their observations?
    iv. What was the purpose of the experiment with the lighted candle and rubber tube?
    
    Solution:
    i. When Rohan and his classmates looked through a straight rubber tube at the candle flame, they could see the light of the candle flame through it.
    ii. When Rohan and his classmates looked through a bent rubber tube at the candle flame, they could not see the light of the candle flame through it.
    iii. From their observations, Rohan and his classmates drew the conclusion that light travels in a straight line. They inferred this because they could see the light of the candle flame through a straight rubber tube but not through a bent rubber tube.
    iv. The purpose of the experiment with the lighted candle and rubber tube was to demonstrate how light travels in a straight line.