NDA PHYSICS QUIZ - 25

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Question 1:

In which among the following, the speed of sound would be maximum?

Question 2:

A sound wave has a  frequency of 4 kHz and wavelength 30 cm. How long will it take to travel 2.4 km ?

Question 3:

Hertz is the S.I. unit of which of the following ?

Question 4:

Which of the following does not have any effect on velocity of sound?

Question 5:

By which device ultrasonic waves are used to measure the distance, direction and speed of bodies in water?

Question 6:

For a sound wave, frequency is 9400 Hz and speed is 282 m/s in a given medium. The wavelength of the wave is-

Question 7:

Supersonic speed is-

Question 8:

Infrasonic waves are sound waves, infrasonic waves have frequency

Question 9:

The loudness or softness of a sound is determined by which of the following ?

Question 10:

Sensation of sound persists in our brain for about- ( in seconds )