General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

61. What is Reynolds number?

[A] ratio of inertial force to viscous force
[B] ratio of weight of fluid to viscous force
[C] ratio of velocity gradient to viscous force
[D] reciprocal of viscous force

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62. What is the S.I unit of frequency?

[A] Second
[B] Watt
[C] Hertz
[D] Joule

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63. In which of the following positions is the potential energy minimum in S.H.M?

[A] Extreme position
[B] Mean position
[C] can be at extreme or mean position
[D] None of the above

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64. What do we call the distance of particle from the mean position at that instant in S.H.M?

[A] Distance
[B] Displacement
[C] Phase
[D] Angular frequency

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65. What is the direction of electric and magnetic fields in an electromagnetic wave?

[A] parallel to each other
[B] perpendicular to each other
[C] at 45° to each other
[D] at 120° to each other

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66. What is the wavelength range of Radio waves?

[A] between 400 nm and 800 nm
[B] between 1 nm and 10-3 nm
[C] more than 0.1 m
[D] None of the above

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67. Which of the following waves is produced when inner shell electrons in atoms move from one energy level to a lower level?

[A] Infrared
[B] X-rays
[C] Ultraviolet
[D] Microwaves

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68. What do we call the distance between two consecutive compressions of a sound wave?

[A] Wave number
[B] Frequency
[C] Wavelength
[D] Amplitude

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69. What do we call the magnitude of the maximum disturbance in the medium on either side of the mean value called as?

[A] Frequency
[B] Angular Displacement
[C] Amplitude
[D] Wave number

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70. Which of the following are generally used to reduce reverberation in an auditorium as sound absorbents?

[A] compressed fibreboard
[B] rough plaster
[C] draperies
[D] All of the above

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