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Question (11)

QN00491

Which instrument in the activities is mainly used to produce a narrow beam of light?

(A) Thick cloth
(B) Torch and comb slit
(C) Glass tumbler
(D) Mirror stand

Correct Answer: B

Explanation:

The slit in the comb creates a narrow beam.

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Question (12)

QN00492

If all holes in the matchbox activity are enlarged, the experiment may become less accurate because

(A) larger holes bend light
(B) alignment becomes less strict
(C) the torch becomes dim
(D) screens absorb more light

Correct Answer: B

Explanation:

Larger holes make exact alignment less important.

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Question (13)

QN00493

Which condition is necessary to observe the bright spot on the screen in the hole-alignment activity?

(A) Holes should be at different heights
(B) Matchboxes should be tilted
(C) Torch and holes should be aligned
(D) Screen should be transparent

Correct Answer: C

Explanation:

Alignment allows the straight beam to pass.

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Question (14)

QN00494

A child stands at one end of a straight tube and views a glowing bulb at the other end. The bulb is visible because

(A) sound carries the image
(B) light travels in straight lines
(C) air reflects the light
(D) the tube emits light

Correct Answer: B

Explanation:

Straight-line travel of light makes the bulb visible.

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Question (15)

QN00495

In the laser-beam activity, milk is added to water mainly to

(A) absorb the laser beam
(B) cool the laser beam
(C) make the path of light visible
(D) change the direction of light

Correct Answer: C

Explanation:

Milk particles scatter light and make the beam visible.

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Question (16)

QN00496

Which of the following situations best supports the idea that light travels straight?

(A) Seeing around a sharp corner without a mirror
(B) Viewing a candle through a curved pipe
(C) Viewing a candle through a straight pipe
(D) Seeing through a thick wall

Correct Answer: C

Explanation:

Light reaches the eye directly through the straight pipe.

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Question (17)

QN00497

A student slightly raises the middle matchbox in the alignment activity. What will most likely happen?

(A) The light spot becomes brighter
(B) The screen glows completely
(C) The light spot disappears
(D) The holes become luminous

Correct Answer: C

Explanation:

Misalignment blocks the straight path of light.

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Question (18)

QN00498

Which statement is true regarding the path followed by light in the activities?

(A) Light always follows a curved path
(B) Light can move through sharp bends naturally
(C) Light follows a straight-line path under normal conditions
(D) Light stops after crossing one obstacle

Correct Answer: C

Explanation:

The activities demonstrate straight-line travel of light.

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Question (19)

QN00499

A student uses a flexible pipe to observe a candle flame. The flame is visible only when the pipe is

(A) bent twice
(B) curved slightly
(C) straight
(D) covered with paper

Correct Answer: C

Explanation:

Light travels directly through a straight pipe.

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Question (20)

QN00500

In the aligned-hole experiment, the screen acts as

(A) a light source
(B) a reflector
(C) a surface to observe the light spot
(D) a translucent object

Correct Answer: C

Explanation:

The screen helps observe the light reaching through the holes.

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Question (11)

Which instrument in the activities is mainly used to produce a narrow beam of light?

Explanation:

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Question (12)

If all holes in the matchbox activity are enlarged, the experiment may become less accurate because

Explanation:

Link:

Question (13)

Which condition is necessary to observe the bright spot on the screen in the hole-alignment activity?

Explanation:

Link:

Question (14)

A child stands at one end of a straight tube and views a glowing bulb at the other end. The bulb is visible because

Explanation:

Link:

Question (15)

In the laser-beam activity, milk is added to water mainly to

Explanation:

Link:

Question (16)

Which of the following situations best supports the idea that light travels straight?

Explanation:

Link:

Question (17)

A student slightly raises the middle matchbox in the alignment activity. What will most likely happen?

Explanation:

Link:

Question (18)

Which statement is true regarding the path followed by light in the activities?

Explanation:

Link:

Question (19)

A student uses a flexible pipe to observe a candle flame. The flame is visible only when the pipe is

Explanation:

Link:

Question (20)

In the aligned-hole experiment, the screen acts as

Explanation:

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