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Question (1)

QN00451

Which of the following is a non-luminous object?

(A) Sun
(B) Firefly
(C) Moon
(D) Lightning

Correct Answer: C

Explanation:

The Moon reflects sunlight and does not emit its own light.

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Question (2)

QN00452

A student places three cardboard sheets with holes in them. Light from a torch reaches the screen only when all holes are exactly aligned. This activity proves that light

(A) bends around corners
(B) travels in a straight line
(C) spreads equally in all directions
(D) stops after some distance

Correct Answer: B

Explanation:

Light passes only when all holes are in one straight line.

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Question (3)

QN00453

Which pair contains only luminous objects?

(A) Moon and Venus
(B) Mirror and Sun
(C) Sun and lightning
(D) Mars and Moon

Correct Answer: C

Explanation:

Both the Sun and lightning emit their own light.

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Question (4)

QN00454

A child tries to see a candle flame through a bent pipe but fails. The most suitable reason is that

(A) air blocks light
(B) the pipe absorbs light
(C) light travels in straight lines
(D) the candle flame is too small

Correct Answer: C

Explanation:

Light cannot bend along the curved pipe.

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Question (5)

QN00455

Which material allows light to pass almost completely through it?

(A) Cardboard
(B) Thick cloth
(C) Frosted glass
(D) Clear glass

Correct Answer: D

Explanation:

Transparent materials like clear glass allow most light to pass through.

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Question (6)

QN00456

A student shines a torch on tracing paper. The spot of light appears dim because tracing paper is

(A) opaque
(B) luminous
(C) translucent
(D) reflective

Correct Answer: C

Explanation:

Translucent materials allow only partial passage of light.

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Question (7)

QN00457

Which statement is correctly matched?

(A) Transparent material — blocks light completely
(B) Opaque material — allows partial passage of light
(C) Translucent material — allows some light to pass
(D) Luminous object — reflects light only

Correct Answer: C

Explanation:

Translucent materials allow some light to pass through them.

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Question (8)

QN00458

A torch is switched on in front of a white screen. When an opaque book is placed between them, a dark patch forms on the screen. This dark patch is called

(A) reflection
(B) image
(C) refraction
(D) shadow

Correct Answer: D

Explanation:

A shadow forms where light is blocked.

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Question (9)

QN00459

A red toy and a blue toy are separately placed in front of the same torch. The colour of the shadows formed on the screen will be

(A) red and blue respectively
(B) both black or dark
(C) red and black respectively
(D) blue and black respectively

Correct Answer: B

Explanation:

Shadow colour does not depend on the object colour.

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Question (10)

QN00460

A ball is moved closer to a torch while the screen remains fixed. The shadow formed on the screen becomes

(A) smaller and sharper
(B) larger
(C) invisible
(D) unchanged in size

Correct Answer: B

Explanation:

An object closer to the light source forms a larger shadow.

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Question (1)

Which of the following is a non-luminous object?

Explanation:

Link:

Question (2)

A student places three cardboard sheets with holes in them. Light from a torch reaches the screen only when all holes are exactly aligned. This activity proves that light

Explanation:

Link:

Question (3)

Which pair contains only luminous objects?

Explanation:

Link:

Question (4)

A child tries to see a candle flame through a bent pipe but fails. The most suitable reason is that

Explanation:

Link:

Question (5)

Which material allows light to pass almost completely through it?

Explanation:

Link:

Question (6)

A student shines a torch on tracing paper. The spot of light appears dim because tracing paper is

Explanation:

Link:

Question (7)

Which statement is correctly matched?

Explanation:

Link:

Question (8)

A torch is switched on in front of a white screen. When an opaque book is placed between them, a dark patch forms on the screen. This dark patch is called

Explanation:

Link:

Question (9)

A red toy and a blue toy are separately placed in front of the same torch. The colour of the shadows formed on the screen will be

Explanation:

Link:

Question (10)

A ball is moved closer to a torch while the screen remains fixed. The shadow formed on the screen becomes

Explanation:

Link:

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