NDA PHYSICS QUIZ - 13

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Question 1:

Supersonic speed is-

Question 2:

Which of the following characteristics of sound helps to distinguish one sound from another?

Question 3:

Sound waves of frequency above 20KHz are known as - 

Question 4:

Which of the following makes contact using Infrasonic sound?

Question 5:

Noise pollution is measured in which of the following units?

Question 6:

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

Question 7:

What type of sound waves are used during "Echocardiography" (ECG).

Question 8:

Which of the following can be used to detect cracks and other defects in metal blocks?

Question 9:

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

Question 10:

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