Question

Q1. Multiple choice questions:

1. Note is a sound:

(a) of mixture of several frequencies (b) of mixture of two frequencies only

(c) of a single frequency (d) always unpleasant to listen.

2. In SONAR we uses:

(a) ultrasonic waves (b) infrasonic waves (c) radio waves (d) audible sound waves

3. The vibrator strikes the water 20 times a second the frequency of wave produced is:

(a) 20 Hz (b) 10 Hz (c) 5 Hz (d) 40 Hz

4. Velocity of sound is:

(a) Greater in air than wood (b) Greater in wood than in steel

(c) Greater in steel than air (d) None of these

5. Speed of sound wave is :

(a) Inversely proportional to its frequency (b) Directly proportional to its frequency

(c) Independent from its frequency (d)inversely proportional to the square root of frequency

6. When we change feeble sound to loud sound we increase its:

(a) Frequency (b) Amplitude (c) Velocity (d) Wavelength

7. Sound waves in air are:

(a) Mechanical waves (b) Longitudinal wave

(c) Transversal wave (d) None of these

8. Infrasound can be heard by:

(a) Dog (b) Bat (c) Rhinoceros (d) Human beings

9. Earthquake produces which kind of sound before the main shock wave begins:

(a) Ultrasound (b) Infrasound (c) audible sound (d) None of these

10. Audible frequency range in humans is:

(a) 20 Hz to 20 KHz (b) 20 Hz to 20,000 KHz (c) 20 KHz to 20,000 KHz (d) None of these​

Answer 1

Explanation:

the answer is

1. c
2. b
3. a
4. b
5. c
6. b
7. b
8. b

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