Sound waves of frequency 20 kHz are called MCQ with Answer and Explanation

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Sound waves of frequency 20 kHz are called

A. Audible

B. Ultrasonic

C. Supersonic

D. Infrasonic

Answer: Option B

Solution (By JKSSB Mock Tests)

Above 20 kHz is ultrasonic.

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Question #1

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Work done against gravity in lifting a 5 kg mass through 2 m (g=10) is

A. 50 J

B. 100 J

C. 25 J

D. 10 J

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Correct Answer: Option B

Explanation:
W = mgh = 5×10×2 = 100 J.

This question belongs to: Science Physics

Question #2

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The device used to measure current in a circuit is

A. Potentiometer

B. Galvanometer

C. Voltmeter

D. Ammeter

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Correct Answer: Option D

Explanation:
Ammeter measures current. Galvanometer detects presence and direction of small currents, can be calibrated as ammeter/voltmeter. Voltmeter measures voltage. Potentiometer measures emf precisely.

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Question #3

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The kinetic energy of a body becomes 4 times. Momentum becomes

A. 2 times

B. Same

C. 16 times

D. 4 times

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Correct Answer: Option A

Explanation:
p ∝ √K, so if K'=4K, p'=2p.

This question belongs to: Science Physics

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