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Question (11)

QN0026287

A sound wave with larger amplitude appears

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

Correct Answer: B

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Question (12)

QN0026288

A sound wave with higher frequency appears

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

Correct Answer: C

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Question (13)

QN0026289

If the frequency of a wave doubles, its time period becomes

(A) double
(B) half
(C) four times
(D) unchanged

Correct Answer: B

Explanation:

Frequency and time period are inversely proportional.

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Question (14)

QN0026290

The speed of sound is given by

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

Correct Answer: C

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Question (15)

QN0026291

A sound wave has wavelength 4 m and frequency 80 Hz. Speed is

(A) 160 m/s
(B) 240 m/s
(C) 320 m/s
(D) 640 m/s

Correct Answer: C

Explanation:

v = fλ = 80 × 4 = 320 m/s

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Question (16)

QN0026292

The bouncing back of sound after striking a surface is called

(A) absorption
(B) reflection
(C) refraction
(D) dispersion

Correct Answer: B

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Question (17)

QN0026293

Reflection of sound follows

(A) laws of reflection
(B) laws of gravitation
(C) Ohm’s law
(D) Newton’s law only

Correct Answer: A

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Question (18)

QN0026294

An echo is heard only if the reflected sound reaches the ear after at least

(A) 0.01 s
(B) 0.05 s
(C) 0.1 s
(D) 1 s

Correct Answer: C

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Question (19)

QN0026295

Minimum distance required to hear a distinct echo when speed of sound is 340 m/s is approximately

(A) 8.5 m
(B) 17 m
(C) 34 m
(D) 68 m

Correct Answer: B

Explanation:

Distance = vt/2 = 340 × 0.1 / 2 = 17 m

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Question (20)

QN0026296

A person hears an echo after 2 seconds. If speed of sound is 340 m/s, distance of reflector is

(A) 170 m
(B) 340 m
(C) 510 m
(D) 680 m

Correct Answer: B

Explanation:

Distance = vt/2 = 340 × 2 / 2 = 340 m

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Question (11)

A sound wave with larger amplitude appears

Explanation:

Link:

Question (12)

A sound wave with higher frequency appears

Explanation:

Link:

Question (13)

If the frequency of a wave doubles, its time period becomes

Explanation:

Link:

Question (14)

The speed of sound is given by

Explanation:

Link:

Question (15)

A sound wave has wavelength 4 m and frequency 80 Hz. Speed is

Explanation:

Link:

Question (16)

The bouncing back of sound after striking a surface is called

Explanation:

Link:

Question (17)

Reflection of sound follows

Explanation:

Link:

Question (18)

An echo is heard only if the reflected sound reaches the ear after at least

Explanation:

Link:

Question (19)

Minimum distance required to hear a distinct echo when speed of sound is 340 m/s is approximately

Explanation:

Link:

Question (20)

A person hears an echo after 2 seconds. If speed of sound is 340 m/s, distance of reflector is

Explanation:

Link:

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