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Question (31)

QN003731

A thunder is heard 6 s after lightning is seen. Distance of lightning from observer is approximately

(A) 340 m
(B) 1020 m
(C) 2040 m
(D) 3000 m

Correct Answer: C

Explanation:

Distance = 340 × 6 = 2040 m

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Question (32)

QN003732

The amplitude of a sound wave represents

(A) speed of sound
(B) maximum change in density
(C) wavelength
(D) time period

Correct Answer: B

Explanation:

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Question (33)

QN003733

Greater amplitude of a sound wave means

(A) lower energy
(B) lower intensity
(C) louder sound
(D) lower pitch

Correct Answer: C

Explanation:

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Question (34)

QN003734

The amount of sound energy passing per unit area per unit time is called

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

Correct Answer: C

Explanation:

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Question (35)

QN003735

Pitch mainly depends on

(A) amplitude
(B) frequency
(C) intensity
(D) speed

Correct Answer: B

Explanation:

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Question (36)

QN003736

A shrill sound has

(A) low frequency
(B) large wavelength
(C) high frequency
(D) low pitch

Correct Answer: C

Explanation:

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Question (37)

QN003737

Human audible range is approximately

(A) 2 Hz to 200 Hz
(B) 20 Hz to 20 kHz
(C) 200 Hz to 2000 Hz
(D) 2000 Hz to 20000 kHz

Correct Answer: B

Explanation:

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Question (38)

QN003738

Sound waves with frequency below 20 Hz are called

(A) ultrasonic
(B) audible
(C) infrasonic
(D) supersonic

Correct Answer: C

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Question (39)

QN003739

Which animal can detect infrasonic waves?

(A) Bat
(B) Dog
(C) Dolphin
(D) Elephant

Correct Answer: D

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Question (40)

QN003740

Ultrasonic waves have frequencies

(A) below 20 Hz
(B) between 20 Hz and 20 kHz
(C) above 20 kHz
(D) exactly 20 kHz

Correct Answer: C

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