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Question (21)

QN005933

Which observation in the slinky activity proves that particles do not travel with the wave?

(A) The slinky becomes longer
(B) The marked turn oscillates back and forth
(C) The colour of slinky changes
(D) The slinky heats up

Correct Answer: B

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Question (22)

QN005934

Sound from a point source spreads in all directions as

(A) straight rays
(B) circular sheets only
(C) spherical waves
(D) stationary waves

Correct Answer: C

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Question (23)

QN005935

Sudden loud sounds from thunder are produced due to

(A) rapid cooling of air
(B) rapid expansion of heated air
(C) magnetic attraction
(D) reflection from clouds

Correct Answer: B

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Question (24)

QN005936

A sonic boom is produced when an aircraft

(A) stops suddenly
(B) flies below sound speed
(C) flies faster than sound
(D) changes direction rapidly

Correct Answer: C

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Question (25)

QN005937

Assertion

(A) Both A and R are true, and R explains A
(B) Both A and R are true, but R does not explain A
(C) A is true, but R is false
(D) A is false, but R is true

Correct Answer: C

Explanation:

Particles only oscillate about their mean positions.

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Question (26)

QN005938

A sound wave travels 680 m in 2 s through air. Its speed is

(A) 170 m/s
(B) 340 m/s
(C) 680 m/s
(D) 1360 m/s

Correct Answer: B

Explanation:

Speed = distance/time = 680/2 = 340 m/s

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Question (27)

QN005939

Sound travels 1500 m in water in 1 second. The speed of sound in water is

(A) 340 m/s
(B) 750 m/s
(C) 1500 m/s
(D) 3000 m/s

Correct Answer: C

Explanation:

Speed = 1500/1 = 1500 m/s

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Question (28)

QN005940

A sound disturbance covers 1020 m in air in 3 seconds. Find its speed.

(A) 300 m/s
(B) 320 m/s
(C) 340 m/s
(D) 360 m/s

Correct Answer: C

Explanation:

Speed = 1020/3 = 340 m/s

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Question (29)

QN005941

A person hears a sound through steel in 0.2 s across a distance of 1000 m. Speed of sound in steel is

(A) 500 m/s
(B) 1000 m/s
(C) 2500 m/s
(D) 5000 m/s

Correct Answer: D

Explanation:

Speed = 1000/0.2 = 5000 m/s

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Question (30)

QN005942

Sound takes 4 s to travel through water over a certain distance. If speed in water is 1500 m/s, the distance is

(A) 375 m
(B) 6000 m
(C) 3000 m
(D) 1500 m

Correct Answer: B

Explanation:

Distance = speed × time = 1500 × 4 = 6000 m

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Question (21)

Which observation in the slinky activity proves that particles do not travel with the wave?

Explanation:

Link:

Question (22)

Sound from a point source spreads in all directions as

Explanation:

Link:

Question (23)

Sudden loud sounds from thunder are produced due to

Explanation:

Link:

Question (24)

A sonic boom is produced when an aircraft

Explanation:

Link:

Question (25)

Assertion

Explanation:

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Question (26)

A sound wave travels 680 m in 2 s through air. Its speed is

Explanation:

Link:

Question (27)

Sound travels 1500 m in water in 1 second. The speed of sound in water is

Explanation:

Link:

Question (28)

A sound disturbance covers 1020 m in air in 3 seconds. Find its speed.

Explanation:

Link:

Question (29)

A person hears a sound through steel in 0.2 s across a distance of 1000 m. Speed of sound in steel is

Explanation:

Link:

Question (30)

Sound takes 4 s to travel through water over a certain distance. If speed in water is 1500 m/s, the distance is

Explanation:

Link:

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