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Question (11)

QN006112

A sound wave with higher frequency appears

(A) louder
(B) softer
(C) shriller
(D) slower

Correct Answer: C

Explanation:

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Question (12)

QN006113

If frequency increases, the time period

(A) increases
(B) decreases
(C) remains same
(D) becomes zero

Correct Answer: B

Explanation:

Frequency and time period are inversely proportional.

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Question (13)

QN006114

The relation between frequency and time period is

(A) f = T
(B) f = 1/T
(C) f = T²
(D) f = 2T

Correct Answer: B

Explanation:

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Question (14)

QN006115

A sound wave has wavelength 2 m and frequency 150 Hz. Its speed is

(A) 75 m/s
(B) 150 m/s
(C) 300 m/s
(D) 450 m/s

Correct Answer: C

Explanation:

v = fλ = 150 × 2 = 300 m/s

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Question (15)

QN006116

The SI unit of wavelength is

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

Correct Answer: A

Explanation:

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Question (16)

QN006117

The speed of a wave is given by

(A) v = f/T
(B) v = λ/T
(C) v = fλ
(D) v = T/λ

Correct Answer: C

Explanation:

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Question (17)

QN006118

A sound wave has speed 340 m/s and wavelength 1.7 m. Frequency is

(A) 100 Hz
(B) 150 Hz
(C) 200 Hz
(D) 250 Hz

Correct Answer: C

Explanation:

f = v/λ = 340/1.7 = 200 Hz

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Question (18)

QN006119

The characteristic that determines whether a sound is loud or soft is

(A) frequency
(B) amplitude
(C) wavelength
(D) pitch

Correct Answer: B

Explanation:

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Question (19)

QN006120

The characteristic that determines whether a sound is shrill or deep is

(A) loudness
(B) intensity
(C) pitch
(D) amplitude

Correct Answer: C

Explanation:

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Question (20)

QN006121

If the amplitude of a sound wave doubles, loudness generally

(A) decreases
(B) remains same
(C) increases
(D) becomes zero

Correct Answer: C

Explanation:

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