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Question (21)

QN0026297

Multiple reflection of sound is used in

(A) thermometers
(B) megaphones
(C) voltmeters
(D) batteries

Correct Answer: B

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Question (22)

QN0026298

Stethoscope works on the principle of

(A) diffraction of sound
(B) refraction of sound
(C) multiple reflection of sound
(D) interference of sound

Correct Answer: C

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Question (23)

QN0026299

Persistence of sound due to repeated reflection in a hall is called

(A) resonance
(B) reverberation
(C) diffraction
(D) refraction

Correct Answer: B

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Question (24)

QN0026300

Excessive reverberation can be reduced by using

(A) metal sheets
(B) marble walls
(C) sound absorbing materials
(D) glass surfaces

Correct Answer: C

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Question (25)

QN0026301

Which material absorbs sound effectively?

(A) Sponge
(B) Steel
(C) Glass
(D) Aluminium

Correct Answer: A

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Question (26)

QN0026302

A wave completes 500 oscillations in 5 seconds. Frequency is

(A) 50 Hz
(B) 100 Hz
(C) 250 Hz
(D) 500 Hz

Correct Answer: B

Explanation:

Frequency = 500/5 = 100 Hz

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Question (27)

QN0026303

A sound wave has speed 360 m/s and frequency 120 Hz. Wavelength is

(A) 1 m
(B) 2 m
(C) 3 m
(D) 4 m

Correct Answer: C

Explanation:

λ = v/f = 360/120 = 3 m

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Question (28)

QN0026304

SONAR is based on

(A) absorption of sound
(B) reflection of sound
(C) refraction of sound
(D) magnetic effect of sound

Correct Answer: B

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Question (29)

QN0026305

A ship receives reflected ultrasonic waves after 6 seconds. If speed in seawater is 1500 m/s, depth of sea is

(A) 1500 m
(B) 3000 m
(C) 4500 m
(D) 9000 m

Correct Answer: C

Explanation:

Depth = vt/2 = 1500 × 6 / 2 = 4500 m

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Question (30)

QN0026306

Frequency remains unchanged when sound travels from one medium to another because

(A) source remains same
(B) wavelength remains same
(C) speed remains same
(D) amplitude becomes zero

Correct Answer: A

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Question (21)

Multiple reflection of sound is used in

Explanation:

Link:

Question (22)

Stethoscope works on the principle of

Explanation:

Link:

Question (23)

Persistence of sound due to repeated reflection in a hall is called

Explanation:

Link:

Question (24)

Excessive reverberation can be reduced by using

Explanation:

Link:

Question (25)

Which material absorbs sound effectively?

Explanation:

Link:

Question (26)

A wave completes 500 oscillations in 5 seconds. Frequency is

Explanation:

Link:

Question (27)

A sound wave has speed 360 m/s and frequency 120 Hz. Wavelength is

Explanation:

Link:

Question (28)

SONAR is based on

Explanation:

Link:

Question (29)

A ship receives reflected ultrasonic waves after 6 seconds. If speed in seawater is 1500 m/s, depth of sea is

Explanation:

Link:

Question (30)

Frequency remains unchanged when sound travels from one medium to another because

Explanation:

Link:

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