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Question (1)

QN00481

Which observation best proves that light travels in a straight line?

(A) A mirror forms an image
(B) A torch becomes hot after use
(C) Light passes through aligned holes only
(D) Transparent objects shine brightly

Correct Answer: C

Explanation:

Light reaches the screen only when all holes are aligned in one straight line.

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Question (2)

QN00482

In the matchbox activity, the bright spot on the screen disappears when one matchbox is slightly moved sideways. This happens because

(A) the screen absorbs light
(B) light cannot bend around the shifted hole
(C) the torch stops working
(D) air blocks the light

Correct Answer: B

Explanation:

Light travels in straight lines and cannot bend around the shifted hole.

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Question (3)

QN00483

A student can see a candle flame through a straight pipe but not through a curved pipe. This shows that light

(A) has no energy
(B) travels only through air
(C) travels in a straight path
(D) passes through all objects

Correct Answer: C

Explanation:

Light travels in straight lines under ordinary conditions.

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Question (4)

QN00484

In the experiment, three holes are arranged at the same height. The light reaches the screen only when the holes are

(A) covered with glass
(B) very large
(C) exactly aligned
(D) close to the torch

Correct Answer: C

Explanation:

Proper alignment allows the straight beam of light to pass through all holes.

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Question (5)

QN00485

A child bends a flexible pipe while viewing a candle flame through it. The flame disappears because

(A) the candle stops emitting light
(B) curved pipes absorb all light
(C) light cannot travel along the bend
(D) the pipe becomes opaque

Correct Answer: C

Explanation:

Light does not naturally bend around corners.

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Question (6)

QN00486

Which statement correctly explains the reason behind the formation of a sharp beam in the comb activity?

(A) Light bends through the slit
(B) Light travels in straight lines through the slit
(C) The comb reflects light
(D) The slit blocks all light

Correct Answer: B

Explanation:

The slit allows a narrow straight beam of light to pass.

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Question (7)

QN00487

In the matchbox activity, if the torch is lowered below the level of the holes, the light spot disappears because

(A) light changes colour
(B) light no longer travels through the aligned path
(C) holes become opaque
(D) the screen reflects light away

Correct Answer: B

Explanation:

The beam misses the aligned holes when the torch is lowered.

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Question (8)

QN00488

Which setup will allow a student to see the candle flame clearly?

(A) A bent pipe facing away from the flame
(B) A straight pipe aligned with the flame
(C) A pipe covered at one end
(D) A pipe placed behind the observer

Correct Answer: B

Explanation:

Straight alignment allows light to travel directly to the eye.

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Question (9)

QN00489

A student places four cardboard sheets with holes in them. If even one hole is out of line, the light beam does not pass through all sheets. This demonstrates that light

(A) travels slowly
(B) spreads randomly
(C) follows a straight path
(D) forms shadows only

Correct Answer: C

Explanation:

Straight-line travel of light is demonstrated by the aligned holes.

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Question (10)

QN00490

During a classroom activity, the teacher shines a laser beam through water containing a drop of milk. The visible beam appears straight because

(A) milk bends the light
(B) water blocks the beam
(C) light travels in straight lines
(D) the laser loses energy

Correct Answer: C

Explanation:

The beam inside the water follows a straight path.

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Question (1)

Which observation best proves that light travels in a straight line?

Explanation:

Link:

Question (2)

In the matchbox activity, the bright spot on the screen disappears when one matchbox is slightly moved sideways. This happens because

Explanation:

Link:

Question (3)

A student can see a candle flame through a straight pipe but not through a curved pipe. This shows that light

Explanation:

Link:

Question (4)

In the experiment, three holes are arranged at the same height. The light reaches the screen only when the holes are

Explanation:

Link:

Question (5)

A child bends a flexible pipe while viewing a candle flame through it. The flame disappears because

Explanation:

Link:

Question (6)

Which statement correctly explains the reason behind the formation of a sharp beam in the comb activity?

Explanation:

Link:

Question (7)

In the matchbox activity, if the torch is lowered below the level of the holes, the light spot disappears because

Explanation:

Link:

Question (8)

Which setup will allow a student to see the candle flame clearly?

Explanation:

Link:

Question (9)

A student places four cardboard sheets with holes in them. If even one hole is out of line, the light beam does not pass through all sheets. This demonstrates that light

Explanation:

Link:

Question (10)

During a classroom activity, the teacher shines a laser beam through water containing a drop of milk. The visible beam appears straight because

Explanation:

Link:

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