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Question (21)

QN00501

A narrow beam of light passing through a slit continues in the same direction after leaving the slit. This indicates that light

(A) changes speed continuously
(B) travels in straight lines
(C) bends automatically
(D) stops after passing through a slit

Correct Answer: B

Explanation:

Light continues along a straight path.

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Question (22)

QN00502

If the candle flame and the straight pipe are not at the same level, the flame may not be visible because

(A) light needs alignment to travel through the pipe
(B) the candle loses brightness
(C) air blocks the light
(D) the pipe becomes reflective

Correct Answer: A

Explanation:

Proper alignment is needed for the light to enter the pipe.

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Question (23)

QN00503

Which of the following can be concluded from the activities on light travel?

(A) Light always bends in air
(B) Light can travel without direction
(C) Light generally moves in straight lines
(D) Light cannot pass through holes

Correct Answer: C

Explanation:

The experiments confirm straight-line motion of light.

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Question (24)

QN00504

In a science exhibition, a student creates a straight tunnel with holes and a torch. Visitors can see the light only from directly opposite the torch because

(A) light spreads equally everywhere
(B) light travels along a straight path
(C) the holes emit light
(D) the tunnel absorbs light

Correct Answer: B

Explanation:

Light reaches only along the straight path.

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Question (25)

QN00505

Which factor is most important for obtaining the light spot in the matchbox activity?

(A) Colour of the screen
(B) Shape of the torch
(C) Exact alignment of holes
(D) Thickness of the cardboard

Correct Answer: C

Explanation:

Aligned holes allow the beam to pass through.

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Question (26)

QN00506

A student observes that the laser beam inside milky water appears as a straight glowing line. This observation supports the idea that

(A) water emits light
(B) milk blocks light completely
(C) light travels in straight lines
(D) lasers move in zigzag paths

Correct Answer: C

Explanation:

The visible beam shows the straight path of light.

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Question (27)

QN00507

Which statement about light is correct according to the activities performed?

(A) Light can move around corners without reflection
(B) Light requires curved paths to travel
(C) Light follows a straight path in ordinary conditions
(D) Light travels only through transparent pipes

Correct Answer: C

Explanation:

Light normally travels in straight lines.

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Question (28)

QN00508

Why is a low-power laser recommended in classroom activities?

(A) It changes colour easily
(B) It is safer for the eyes
(C) It bends less in water
(D) It forms larger beams

Correct Answer: B

Explanation:

High-power lasers can damage the eyes.

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Question (29)

QN00509

In the straight-pipe activity, the pipe mainly helps to

(A) cool the candle flame
(B) reflect light to the observer
(C) check whether light can travel through a straight path
(D) absorb extra light

Correct Answer: C

Explanation:

The activity tests straight-line travel of light.

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Question (30)

QN00510

A science teacher asks students to predict whether light from a torch will pass through misaligned holes. The correct prediction is that the light will

(A) bend automatically to pass through
(B) spread and pass through all holes
(C) fail to pass through all holes
(D) become brighter after crossing holes

Correct Answer: C

Explanation:

Misaligned holes block the straight beam of light.

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Question (21)

A narrow beam of light passing through a slit continues in the same direction after leaving the slit. This indicates that light

Explanation:

Link:

Question (22)

If the candle flame and the straight pipe are not at the same level, the flame may not be visible because

Explanation:

Link:

Question (23)

Which of the following can be concluded from the activities on light travel?

Explanation:

Link:

Question (24)

In a science exhibition, a student creates a straight tunnel with holes and a torch. Visitors can see the light only from directly opposite the torch because

Explanation:

Link:

Question (25)

Which factor is most important for obtaining the light spot in the matchbox activity?

Explanation:

Link:

Question (26)

A student observes that the laser beam inside milky water appears as a straight glowing line. This observation supports the idea that

Explanation:

Link:

Question (27)

Which statement about light is correct according to the activities performed?

Explanation:

Link:

Question (28)

Why is a low-power laser recommended in classroom activities?

Explanation:

Link:

Question (29)

In the straight-pipe activity, the pipe mainly helps to

Explanation:

Link:

Question (30)

A science teacher asks students to predict whether light from a torch will pass through misaligned holes. The correct prediction is that the light will

Explanation:

Link:

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