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### Sound - MCQs

Sound - MCQs Points :sound mcqs, mechanics fill in the blanks, mechanics objective type questions 1. It is possible to distinguish between transverse and longitudinal waves by studying the property of
(a) interference
(b) diffraction
(c) reflection
(d) polarization

2. In a mechanical transverse wave, the particles of the medium
(a) vibrate in a direction perpendicular to the direction of propagation
(b) vibrate in a direction parallel to the direction of propagation
(c) move in circles
(d) move in ellipses

3. When a sound wave goes from one medium to another, the quantity that remains unchanged is
(a) speed
(b) amplitude
(c) frequency
(d) wavelength

4. A big explosion on the moon cannot be heard on the earth because
(a) the explosion produces high frequency sound waves which are inaudible
(b) sound waves require a material medium for propagation
(c) sound waves are absorbed in the moon’s atmosphere
(d) sound waves are absorbed in the earth’s atmosphere

5. In a mechanical longitudinal wave, the particles of the medium
(a) vibrate in a direction perpendicular to the direction of propagation
(b) vibrate in a direction parallel to the direction of propagation
(c) move in circles
(d) move in ellipses

6. Transverse waves can propagate
(a) both in gas and metal
(b) in gas but not in metal
(c) in metal but not in gas
(d) neither in gas nor in metal

7. An astronaut cannot hear his companion on the surface of the moon because
(a) produced frequencies are above the audio frequencies
(b) there is no medium for sound propagation
(c) temperature is too low during night and too high during day
(d) there are too many craters on the surface of the moon

8. Which of the following does a wave transmit from one place to another?
(a) Mass
(b) Amplitude
(c) Momentum
(d) Energy

9. The velocity of Sound in air is not affected by changes in the
(a) moisture content of the air
(b) temperature of the air
(c) atmospheric pressure
(d) composition of the air

10. Of the following properties of a wave, the one that is independent of the other is its
(a) amplitude
(b) frequency
(c) wavelength
(d) speed

11. If the temperature of a gas is raised, the velocity of sound in it
(a) increases
(b) decreases
(c) remains constant
(d) changes in the same way as it would due to variation in the pressure of the gas

12. The ratio between velocity of sound in air at 4 atm and that at 1 atm pressure would be
(a) 1:1
(b) 4:1
(c) 1:4
(d) 3:1

13. The velocity of sound in a gas is proportional to
(a) the square root of isothermal elasticity
(c) the square root of adiabatic elasticity
(d) isothermal elasticity

14. The velocity of sound is largest in
(a) water
(b) air
(c) steel rod
(d) kerosene

15. Sound travels in rocks in the form of
(a) longitudinal elastic waves only
(b) transverse elastic waves only
(c) both longitudinal and transverse elastic waves
(d) non-elastic waves

16. With an increase in the water vapour content of air the velocity of sound
(a) increases
(b) decreases
(c) remains unchanged
(d) changes erratically

17. The ratio of the speed of a body to the speed of sound is called
(a) sonic index
(b) doppler ratio
(c) mach number
(d) refractive index

18. The temperature at which the speed of sound in air becomes double of its value at 0°C is
(a) 273°C
(b) 546°C
(c) 819°C
(d) 1092C

19. When mechanical waves have a frequency above the audible range these are called
(a) sonics
(b) infrasonics
(c) ultrasonics
(d) supersonics

20. Ultrasonic waves produced in a medium can be detected by
(a) a telephones
(b) Hebb’s-method
(c) Kundt’s tube
(d) Quincke’s tube

21. When mechanical waves have a frequency below the audible range, these are called
(a) sonics
(b) infrasonics
(c) ultrasonics
(d) supersonics

22. Standing stationary waves can be obtained in an air column even if the interfering waves are
(a) of different pitches
(b) of different amplitudes
(c) of different qualities
(d) moving with different velocities

23. The variation of the speed of sound with temperature is greatest in
(a) metals
(b) gases
(c) solids
(d) liquids

24. Hertz is the unit of
(a) energy
(b) electric field strength
(c) frequency
(d) magnetic permeability

25. The wavelength of sound made from a tuning fork of frequency 330 Hz is nearly
(a) 100cm
(b) 10cm
(c) 1cm
(d) 330cm

26. Sound travels in air as
(a) longitudinal waves
(b) transverse waves
(c) torsional waves
(d) electromagnetic waves

27. Two waves of the same frequency, travelling in the same medium but in Opposite directions, if Superposed, give rise to
(a) resonance
(b) beats
(c) standing waves
(d) harmonies

28. Energy is not carried by
(a) transverse progressive wave
(b) longitudinal progressive wave
(c) stationary wave
(d) electromagnetic wave

29. The wave-like property shown by a column of soldiers marching obliquely from a hard road onto soft muddy tract is
(a) diffraction
(b) refraction
(c) interference
(d) polarisation

30. A regiment of soldiers is crossing a suspension bridge. They are ordered to
(a) break their step
(b) march in step
(c) do rock and roll
(d) twist their bodies

31. In stationary waves
(a) energy s uniformly distributed
(b) energy is maximum at nodes and minimum at antinodes
(c) energy is minimum at nodes and maximum at antinodes
(d) alternating maxima and minima 01 energy are produced at nodes and antinodes

32.In the phenomenon of interference, energy
(a) is destroyed
(b) is created
(c) is destroyed at some places and created at others
(d) is neither destroyed nor created but is redistributed

33. The velocity of sound in air is 300 m/s. Therefore the distance between the two successive nodes of a stationary wave of frequency 1000 Hz is
(a) 10cm
(b) 20cm
(c) 15cm
(d) 30cm

34. The resultant of two collinear simple harmonic motions of same frequency but of different amplitude and phase is
(a) simple harmonic
(b) circular
(c) elliptical
(d) parabolic

35. A resonating column of air contains
(a) stationary longitudinal waves
(b) stationary transverse waves
(c) transverse progressive waves
(d) longitudinal progressive waves

36. With an increase in temperature, the frequency of sound from an organ pipe
(a) decreases
(b) increases
(c) remains unchanged
(d) changes erratically

37. A sonometer wire is generally mounted over a large hollow wooden sound box. This increases the (a) frequency of sound
(b) velocity of sound
(c) intensity of sound
(d) wavelength of sound

38. When an empty vessel is filled with water, its frequency
(a) increases
(b) decreases
(c) remains the same
(d) none of these

39. Due to damping, the frequency of a vibrating body
(a) increases
(b) decreases
(c) does not change
(d) changes erratically

40. In a vibrating string with fixed ends the waves are of the following type
(a) stationary longitudinal
(b) stationary transverse
(c) progressive transverse
(d) progressive longitudinal

41. If the frequency of vibration of a string is increased by a factor of 2, then the tension in the string will be
(a) half
(b) double
(c) fourtimes
(d) 1/4times

42. The pitch of a sound depends upon its
(a) wave length
(b) frequency
(c) amplitude
(d) periodicity and regularity

43. When a tuning fork vibrates, waves produced in the prongs are
(a) transverse and progressive
(b) transverse and stationary
(c) longitudinal and stationary
(d) longitudinal and progressive

44. Two organ pipes produce 2 beats per second at 10°C. If the temperature rises to 30°C, then the number of beats will
(a) decrease
(b) increase
(c) sometimes increase and sometimes decrease
(d) remain unchanged

45. When the prong of a tuning fork is slightly displaced from its normal position and left !o itself, it tries to return to its original position. This is due to
(a) inertia
(b) elasticity
(c) weight
(d) external forces

46. The same notes being played on the sitar and veena differ in
(a) pitch
(b) quality
(c) both pitch and quality

(d) none of the above
47. If one of the prongs of a tuning fork gets broken the vibrations
(a) are maintained equally well
(b) are maintained better
(c) cannot be maintained
(d) can be maintained either better or equally well

48. Decibel is
(a) a musical instrument
(b) a musical note
(c) a measure of sound level
(d) the wavelength of noise

49. If the frequency of the vibration of a string be increased by a factor of two, then the tension in the
string should be
(a) half
(b) double
(c) three times
(d) four times

50. The fundamental frequency of a string stretched with a weight of 4 kg is 256 H. The weight required to produced its octave is
(a) 4 kg
(b) 12 kg
(c) 16kg
(d) 24kg

51. The loudness of a sound depends upon its
(a) wavelength
(b) frequency
(c) amplitude
(d) overtones

52. The quality of sound depends upon its
(a) wave length
(b) amplitude
(c) frequency
(d) overtones

53. In a harmonium the intermediate notes between a note and its octaves form
(a) an arithmetic progression
(b) a geometric progression
(c) a harmonic progression
(d) an exponential progression

54. The sweetness of a sound depends upon its
(a) wave length
(b) frequency
(c) amplitude
(d) periodicity and regularity

55. Which of the following emits sound of the highest pitch?
(a) Mosquito
(b) Lion
(c) Man
(d) Woman