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Question (11)

QN003711

In the vacuum bell jar experiment, sound becomes faint because

(A) the bell stops vibrating
(B) the bell loses energy
(C) air is removed from the jar
(D) the jar absorbs sound completely

Correct Answer: C

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Question (12)

QN003712

Which statement is correct for sound waves?

(A) Particles move with the wave continuously
(B) Particles vibrate about mean positions
(C) Medium flows from source to listener
(D) Only compressions travel

Correct Answer: B

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Question (13)

QN003713

A region of higher density in a sound wave is called

(A) trough
(B) rarefaction
(C) compression
(D) amplitude

Correct Answer: C

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Question (14)

QN003714

A region of lower density in a sound wave is called

(A) compression
(B) crest
(C) rarefaction
(D) wavelength

Correct Answer: C

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Question (15)

QN003715

Sound waves are

(A) transverse electromagnetic waves
(B) longitudinal mechanical waves
(C) transverse mechanical waves
(D) stationary waves

Correct Answer: B

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Question (16)

QN003716

In a longitudinal wave, particles vibrate

(A) perpendicular to wave propagation
(B) parallel to wave propagation
(C) randomly
(D) in circles

Correct Answer: B

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Question (17)

QN003717

Which quantity represents the number of oscillations per second?

(A) Time period
(B) Wavelength
(C) Frequency
(D) Amplitude

Correct Answer: C

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Question (18)

QN003718

The SI unit of frequency is

(A) metre
(B) second
(C) hertz
(D) decibel

Correct Answer: C

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Question (19)

QN003719

The time taken for one complete oscillation is called

(A) intensity
(B) wavelength
(C) pitch
(D) time period

Correct Answer: D

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Question (20)

QN003720

If the frequency of a wave is 25 Hz, its time period is

(A) 25 s
(B) 0.04 s
(C) 4 s
(D) 0.4 s

Correct Answer: B

Explanation:

T = 1/f = 1/25 = 0.04 s

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Question (11)

In the vacuum bell jar experiment, sound becomes faint because

Explanation:

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Question (12)

Which statement is correct for sound waves?

Explanation:

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Question (13)

A region of higher density in a sound wave is called

Explanation:

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Question (14)

A region of lower density in a sound wave is called

Explanation:

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Question (15)

Sound waves are

Explanation:

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Question (16)

In a longitudinal wave, particles vibrate

Explanation:

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Question (17)

Which quantity represents the number of oscillations per second?

Explanation:

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Question (18)

The SI unit of frequency is

Explanation:

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Question (19)

The time taken for one complete oscillation is called

Explanation:

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Question (20)

If the frequency of a wave is 25 Hz, its time period is

Explanation:

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