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Showing 51 to 75 of 3046 questions (page 3 of 122).

51. The speed of sound in dry air at 0 degrees Celsius is about

A. 300 m s-1 B. 332 m s-1 C. 343 m s-1 D. 1500 m s-1 E. 5000 m s-1

52. The number of beats heard per second when two tuning forks of frequencies 256 Hz and 260 Hz sound together is

A. 2 B. 4 C. 8 D. 256 E. 516

53. The distance between two consecutive nodes in a stationary wave is

A. lambda B. lambda/2 C. lambda/4 D. 2 lambda E. lambda/8

54. Newton's formula for the speed of sound in air was corrected by Laplace by assuming the process is

A. isothermal B. adiabatic C. isochoric D. isobaric E. irreversible

55. The fundamental frequency of an open organ pipe of length L is

A. v/4L B. v/2L C. v/L D. 2v/L E. 4v/L

56. The speed of sound in a gas is proportional to

A. T B. T2 C. sqrt(T) D. 1/T E. 1/sqrt(T)

57. The apparent change in the frequency of sound due to relative motion between source and observer is called

A. interference B. diffraction C. the Doppler effect D. resonance E. polarization

58. A stationary wave is produced when two waves of equal frequency and amplitude travel

A. in the same direction B. in opposite directions C. at right angles D. with different speeds E. with a phase difference of 90 degrees

59. In Young's double slit experiment, the fringe spacing is given by

A. d lambda / L B. lambda L / d C. d L / lambda D. lambda / dL E. L / d lambda

60. Polarization of light establishes that light waves are

A. longitudinal B. transverse C. mechanical D. stationary E. non-periodic

61. The grating equation for normal incidence is

A. d sin theta = n lambda B. d cos theta = n lambda C. d tan theta = n lambda D. sin theta = n d lambda E. d sin theta = lambda / n

62. According to Brewster's law, the tangent of the polarizing angle equals

A. the wavelength B. the refractive index of the medium C. the reciprocal of the refractive index D. unity E. the critical angle

63. For two sources to produce a sustained interference pattern, they must be

A. of different frequencies B. coherent C. of different amplitudes D. perpendicular to each other E. incoherent

64. Newton's rings are formed due to interference in

A. a thick glass block B. a wedge shaped air film C. a plane parallel plate D. a diffraction grating E. a polarizer

65. Bending of light around the edges of an obstacle is called

A. refraction B. interference C. diffraction D. dispersion E. polarization

66. The magnifying power of a simple microscope with the image at the near point is

A. d/f B. 1 + d/f C. 1 - d/f D. f/d E. 1 + f/d

67. The least distance of distinct vision for a normal human eye is

A. 10 cm B. 25 cm C. 50 cm D. 1 m E. infinity

68. Light propagates along an optical fibre mainly by

A. diffraction B. dispersion C. total internal reflection D. polarization E. refraction at the far end

69. The resolving power of a telescope increases when

A. the wavelength is increased B. the aperture is increased C. the focal length of the eyepiece is increased D. the magnification is reduced E. the aperture is decreased

70. In a compound microscope, the objective forms an image that is

A. virtual and erect B. real, inverted and magnified C. real and diminished D. virtual and diminished E. at infinity

71. The value of the universal gas constant R in SI units is

A. 0.0821 B. 8.314 C. 1.987 D. 62.4 E. 0.083

72. The first law of thermodynamics is a statement of the conservation of

A. mass B. momentum C. energy D. entropy E. charge

73. For an isothermal expansion of an ideal gas, the change in internal energy is

A. positive B. negative C. zero D. equal to the work done E. equal to the heat absorbed times gamma

74. For one mole of an ideal gas, Cp - Cv equals

B. R C. R/2 D. 2R E. gamma R

75. The efficiency of a Carnot engine operating between temperatures T1 (source) and T2 (sink) is

A. 1 - T1/T2 B. 1 - T2/T1 C. T2/T1 D. T1/T2 E. T1 - T2

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