• Light, Shadows and Reflection (Grade - 6)
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Light, Shadows and Reflection (Grade - 6)

Description: Light Shadows and Reflection
Number of Questions: 16
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Tags: Light Shadows and Reflection Source of light Pinhole camera Shadows Reflection of light Arithmetic Reasoning Time and Work Light, Shadow and Reflection Concept of Shadow Understanding the Concept of Reflection of Light and Application
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Which of the following statements is/are false?

a. An invisible energy that causes the sensation of vision is called light. b. Shadows can be smaller or bigger than the opaque body. c. The speed of light is 3 x 106 m per second.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: E
Explanation:

This is the correct option as this statement is false. The speed of light is 3 x 108 m per second.

Which of the following is not a characteristic of an image in a pinhole camera?

  1. Image in the pinhole camera is always smaller than the object.

  2. Image in the pinhole camera is always inverted.

  3. All colours are seen in the image in a pinhole camera.

  4. Image in a pinhole camera is not misleading.

  5. Image in a pinhole camera is a dark outline formed behind an opaque body.

Show answer
Correct Option: E
Explanation:

This is the correct option. Image in a pinhole camera shows all details of an object.

Which of the following is not a heterogeneous medium?

  1. Air

  2. Fog

  3. Mist

  4. Smoke

  5. Vaccum

Show answer
Correct Option: E
Explanation:

This is the correct option as vaccum is not a heterogeneous medium. 

Which of the following is/are the primary source of natural light for Earth?

  1. Planets

  2. Asteroids

  3. Meteors

  4. Sun

  5. Moon

Show answer
Correct Option: D
Explanation:

This is the correct option. Sun is the primary source of natural light for Earth.

Which of the following is a translucent medium?

  1. Thin layer of water

  2. Alcohol

  3. Vacuum

  4. Oiled paper

  5. Benzene

Show answer
Correct Option: D
Explanation:

This is the correct option. Oiled paper is a translucent medium. 

Which of the following changes will take place in an image formed by pinhole camera if the tissue paper screen is moved towards the pinhole?

  1. Image will become bigger in size, less bright and erect.

  2. Image will become bigger in size, less bright and will remain inverted.

  3. Image will become bigger in size, somewhat more bright and will remain inverted.

  4. Image will become smaller in size, somewhat more bright and will remain inverted.

  5. Image will become smaller in size, less bright and will remain inverted.

Show answer
Correct Option: D
Explanation:

This is the correct option. 

A pinhole camera is a very simple device based on the principle of

  1. reflection of light

  2. refraction of light

  3. rectilinear propagation of light

  4. scattering of light

  5. None of these

Show answer
Correct Option: C
Explanation:

This is the correct option. A pinhole camera is a very simple device based on the principle of rectilinear propagation of light. It states that light travels in straight lines.

Which of the following do not emit light in the darkness?

a. Glow worms b. Fire flies c. Bed bugs

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: E
Explanation:

This is the correct option as bed bugs do not emit light in the darkness.

Which of the following is not a condition for the formation of a dark shadow?

a. There must be an opaque screen for receiving the shadow. b. There must be a translucent body to obstruct the light. c. There must be a source of light from where light must be coming.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this is not a condition for the formation of a dark shadow.

Which of the following types of images will be formed if the pinhole in a pinhole camera becomes bigger?

  1. Image will be erect and blurred.

  2. Image will be inverted and sharp.

  3. Image will be erect and sharp.

  4. Image will be inverted and blurred.

  5. Image will be inverted, blurred, but bigger in size than the object.

Show answer
Correct Option: D
Explanation:

This is the correct option as if the pinhole in a pinhole camera becomes bigger, the image formed will be inverted and blurred. It is due to the fact that when more than one ray will enter the camera from the given point, it will result in the formation of two or more images overlapping one another. This will result in a blurred image.

Match the following:

 
a. Point source of light 1. It is the phenomenon due to which a beam of light bounces off from a smooth polished surface in some other direction.
b. Ray of light 2. It is the source of light which is of the size of the head of a common pin.
c. Reflection of light 3. It is the path along which light energy travels in a given direction.

  1. a – 3, b – 2, c – 1

  2. a – 1, b – 3, c – 2

  3. a – 1, b – 2, c – 3

  4. a – 2, b – 1, c – 3

  5. a – 2, b – 3, c – 1

Show answer
Correct Option: E
Explanation:

This is the correct option. Point source of light is the source of light which is of the size of the head of a common pin. Ray of light is the path along which light energy travels in a given direction. Reflection of light is the phenomenon due to which a beam of light bounces off from a smooth polished surface in some other direction.

A shadow is a dark patch formed behind an opaque body when it is placed in the path of light. Which of the following is not a characteristic of a shadow?

  1. The shape of the shadow may or may not match with that of the object.

  2. A shadow is a dark outline of the object.

  3. The size of the shadow increases if the opaque body is closer to the source of light and away from the screen.

  4. The size of the shadow decreases if the opaque body is closer to the screen and away from the source of light.

  5. Objects of same colour, but of different shapes form the same kind of shadow.

Show answer
Correct Option: E
Explanation:

This is the correct option as this is not a characteristic of a shadow. Objects of different colour, but of same shape form the same kind of shadow, i.e. a dark patch.

Match the following:

 
a. Luminous bodies 1. They are those bodies that do not emit light of their own, but reflect the light energy falling on them.
b. Non-luminous bodies 2. They are those bodies that do not allow the light energy to pass through them.
c. Opaque bodies 3. They are those bodies that emit light by themselves.

  1. a – 3, b – 2, c – 1

  2. a – 3, b – 1, c – 2

  3. a – 1, b – 3, c – 2

  4. a – 1, b – 2, c – 3

  5. a – 2, b – 1, c – 3

Show answer
Correct Option: B
Explanation:

This is the correct option. Luminous bodies are those bodies that emit light by themselves. Non-luminous bodies are those bodies that do not emit light of their own, but reflect the light energy falling on them. Opaque bodies are those bodies that do not allow the light energy to pass through them.

Which of the following is/are the characteristic(s) of an image in a pinhole camera?

  1. Image is inverted and enlarged.

  2. Image is inverted and diminished.

  3. Image is erect and diminished.

  4. Image is erect and enlarged.

  5. Image formed is erect and of the same size as the object.

Show answer
Correct Option: B
Explanation:

This is the correct option as these are the characteristics of image in a pinhole camera. The image formed is upside down and very small as compared to the object.

Which of the following statements is/are false?

a. Planets reflect the light of the Sun falling on them. b. A non-luminous body can be made a luminous body by cooling it. c. Anything through which light energy can pass partially or wholly is called an optical medium.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this statement is false. A non-luminous body can be made a luminous body by heating it.

Match the following:

 
a. Homogeneous medium 1. It is a medium that partially allows light energy to pass through it.
b. Heterogeneous medium 2. It is an optical medium that has different compositions at different points.
c. Translucent medium 3. It is an optical medium that has uniform composition throughout.

  1. a – 3, b – 2, c – 1

  2. a – 3, b – 1, c – 2

  3. a – 1, b – 3, c – 2

  4. a – 2, b – 3, c – 1

  5. a – 1, b – 2, c – 3

Show answer
Correct Option: A
Explanation:

This is the correct option. Homogeneous medium is an optical medium that has uniform composition throughout. Heterogeneous medium is an optical medium that has different compositions at different points. Translucent medium is a medium that partially allows light energy to pass through it.

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