#### Acoustics One Mark Questions

10th Standard

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Science

Time : 00:30:00 Hrs
Total Marks : 15
5 x 1 = 5
1. When a sound wave travels through air, the air particles

(a)

vibrate along the direction of the wave motion

(b)

vibrate but not in any fixed direction

(c)

vibrate perpendicular to the direction of the wave motion

(d)

do not vibrate

2. The frequency, which is audible to the human ear is

(a)

50 kHz

(b)

20 kHz

(c)

15000 kHz

(d)

10000 kHz

3. The velocity of sound is affected by

(a)

temperature

(b)

density

(c)

pressure

(d)

all the above

4. The speed of sound in air is 300 m/s. What is the frequency as heard by the human ear?

(a)

0.001 Hz

(b)

1 Hz

(c)

10,000 Hz

(d)

1,00,000 Hz

5. Infrasound can be heard or produced by

(a)

dog

(b)

bat

(c)

rhinoceros

(d)

human beings

6. 5 x 1 = 5
7. Rapid back and forth motion of a particle about its mean position is called _____

()

Longitudinal

8. If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in _____

()

Amplitude

9. A wave motion is a transfer of _______.

()

energy

10. For propagation of sound wave, the medium must possess________.

()

volume elasticity

11. Speed of sound in solid is ________ than liquid

()

greater

12. 5 x 1 = 5
13. Infrasonic

14. (1)

Ultrasonography

15. Echo

16. (2)

22 kHz

17. Ultrasonic

18. (3)

E∝A2

19. Wavelength

20. (4)

10 Hz

21. Amplitude

22. (5)

Distance