#### Acoustics Model Question Paper

10th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. Distance between two consecutive compressions is

(a)

λ

(b)

λ/2

(c)

λ/4

(d)

2. Sound can travel in

(a)

air

(b)

any material medium

(c)

vacuum

(d)

none

3. Sound travels with a velocity of ____________ in dry air

(a)

332 ms-1

(b)

330 ms-1

(c)

331 ms-1

(d)

336 ms-1

4. Dogs can receive sound upto _____ kHz.

(a)

20

(b)

25

(c)

10

(d)

15

5. When sound travels through air, the air particles.

(a)

do not vibrate

(b)

vibrate but not in any fixed direction

(c)

vibrate perpendicular to the direction of wave propagation

(d)

vibrate along the direction of wave propagation

6. 4 x 2 = 8
7. What is the principle used in whispering gallery?

8. What is the difference between wave velocity and particle velocity?

9. Why does sound travel faster in solids than in gases?

10. How is it possible to defect the approaching of a distant train by placing the ear very close to the railway line?

11. 4 x 4 = 16
12. Write the applications of echo.

13. Write any two applications for reflection of sound?

14. Explain the working and use of SONAR?

15. Write the applications of Doppler effect.

16. 3 x 7 = 21
17. What is the frequency heard by a stationary observer when a train approaches with a speed of 30 ms-1. The frequency of the train is 600 Hz and the speed of sound is 340 m/s?

18. Find the speed of sound in air at 9.23° C.

19. At 10° C, how for away is a reflecting surface if you hear an echo in 0.274s?