Physics X I Sound

1. Which of the following represents Longitudinal waves: a) Sound waves b) Radio waves c) Light waves d) X-rays

2. Velocity of sound increases with the: a) Surface area b) Increase in pressure c) Increase in Viscosity of medium d) Depth of medium

3. The maximum number of beat that can be detected by human ear is: a) 3 b) 7 c) 9 d) 5

4. Decibel is the unit of: a) Speed of waves b) Intensity Level c) Frequency d) Wave length

5. The pitch of the sound depends on: a) Velocity b) Wave length c) Intensity d) Frequency

6. Longitudinal waves are also called as: a) Radio waves b) Transverse waves c) Mechanical waves d) Compressional waves

7. The speed of sound is highest in: a) Vacuum b) Gas c) Solid d) Liquid

8. In Compressional waves the layer of medium having reduced pressure is called: a) Node b) Compression c) Rarefaction d) Elasticity

9. One Sone at 1000 hz is equal to: a) 30 db b) 40 db c) 100db d) 60 db

10. The Earthquake are the example of: a) Shock waves b) Ultrasonic waves c) Infrasonic waves d) Audible waves

11. The voice of two persons having the same pitch and loudness can be recognized due to the characteristics of the sound known as: a) Intensity b) Beats c) Quality d) Frequency

12. Sound waves can not propagate through: a) Grass b) Wool c) Vacuum d) Walls

13. Velocity of sound increases with the: a) Surface area of medium b) Viscosity of medium c) Elasticity of medium d) Pressure of medium

14. Velocity of sound decreases with the: a) Viscosity of medium b) Density of medium c) Elasticity of medium d) Pressure of medium

15. The speed of sound is: a) Independent of pressure b) Directly proportional to pressure c) Inversely proportional to pressure d) Equal to pressure

16. The amount of energy transmitted normally per second through the unit area of the surface is called: a) Loudness of sound b) Frequency of sound waves c) Intensity of sound d) Pitch of sound

17. The S.I unit of intensity of sound is: a) Joule / Sec b) Watt / m2 c) Watt . m d) Joule . Sec

18. Loudness of sound depends on intensity as well as the: a) Frequency b) Amplitude c) Wavelength d) Ear

19. According to Weber-fechner Law, Loudness of sound is directly proportional to the: a) Square of intensity b) Square root of intensity c) Cube root of intensity d) Logarithm

20. The difference in Loudness of two sounds is known as: a) Frequency b) Wavelength c) Energy d) Intensity Level

21. The unit of intensity level of sound is called: a) Joule b) Bel c) Hertz d) Watt / m2

22. The intensity of ordinary conversation is: a) 10 -8 watt / m2 b) 10 -6 watt / m2 c) 10 - 9 watt / m2 d) 10 -12 watt / m2

23. The intensity level of ordinary conversation is: a) 30 db b) 40 db c) 50 db d) 60 db

24. The intensity level of faintest audible sound is: a) 0.1 db b) 10 -3 db c) 10 -6 db d) 0 db

25. When two bodies of slightly different frequencies are sounded simultaneously there are rises and falls in the loudness of the resultant sound called: a) Alterations b) Beats c) Resonance d) None of these

26. Doppler's effect is the change in frequency of sound caused by the relative motion of: a) Source of sound b) Listener c) Both source and listener d) All of these

27. Echoes are produced by: a) Reflection of sound waves b) Deflection of sound waves c) Interference of sound waves d) Diffraction of sound waves

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