MSCQs of Chapter 8 – Wave Motion and Sound

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Fill in the Blanks

1. The SHM is a __________ motion.

2. The SHM is a motion under __________ force.

3. In case of SHM __________ is proportional to displacement and is always directed towards mean position.

4. In SHM the system should be free from __________.

5. In SHM the system must possess __________.

6. In SHM the amplitude of vibration remains __________.

7. In SHM the time period of vibrating body remain __________.

8. The time period of simple pendulum __________ with its length.

9. The gravitational acceleration at a place is inversely proportional to the __________ of its time period of a simple pendulum at that place.

10. The simple pendulum comes to rest after some time due to the friction at the support and __________ resistance.

11. Stationary waves are produced due to the phenomenon of __________.

12. In stationary waves, node are the points at which __________ of the particles of the medium is zero.

13. In standing waves, the points at which particles of medium vibrate maximum amplitude are called __________.

14. In standing waves, at nodes particles, of the medium are under __________ tension.

15. In standing waves produced in a stretched string, when string is vibrating in two loops, the frequency of waves is equal to the __________ of fundamental frequency.

16. In standing waves produced in a stretched string, the second harmonic is also called __________ multiple.

17. Decibel is a unit of __________.

18. The number of beats produced per second is equal to __________ of frequency between the two vibrating bodies producing beats.

19. The phenomenon in the variation of __________ of sound due to relative motion of source or observer is called Doppler’s Effect.

20. When a listener moves towards a stationary source, the pitch of sound appears to __________.

21. The equation Y = f(x-vt) represents a travelling wave travelling towards __________.

22. The sound waves are __________ and longitudinal waves in nature.

23. The speed of sound waves through a gas is __________ to its absolute temperature.

24. The particle’s velocity at antinodes in standing wave is __________.

25. The pitche of a sound note depends upon its __________ of vibration.

26. Y = -Aosin kx (coswt) represents the equation of a __________ wave.

27. Another term used for quality of sound is __________.

28. The characteristic by which one sound can be distinguished from other is known as __________.

29. The sound absorbing soft porous materials are used in big hall is order to have good __________.

30. Radar is an abbreviation of __________.

31. In standing waves the distance between two __________ nodes or antinodes is equal to one wavelength.

32. In standing waves the distance between one node and nearest antinode is equal to __________ wavelength.

33. In standing waves the particles velocity at the nodal point is __________.

34. The velocity of sound waves in vacuum is __________.

35. When sound waves travel through any gas the phenomena is __________.

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