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 the oscillation in which the loss of oscillator is compensated by the supplying energy from an external source known as?

[A] Free oscillation
[B] Maintained oscillation
[C] Forced oscillation
[D] Damped oscillation

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62. What is the effect of rise of temperature on the time period of a simple pendulum?

[A] it increases
[B] it decreases
[C] it may or may not increase
[D] No relationship

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63. By what phase angle the velocity is ahead of displacement in S.H.M?

[A] π
[B] π/4
[C] π/2
[D] 2π

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64. What is the S.I unit of the propagation constant?

[A] radian metre
[B] radian per metre
[C] radian per second
[D] radian per centimetre

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65. What part of the electromagnetic spectrum is detected by the human eye?

[A] Between 400 nm and 700 nm
[B] Between 40 nm and 70 nm
[C] Between 400 nm and 7000 nm
[D] Between 4 nm and 700 nm

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66. 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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67. What is the effect of increase of temperature on the speed of sound?

[A] it increases
[B] it decreases
[C] it may or may not increase
[D] No effect

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68. Which of the following sounds is produced by earthquakes before the main shock waves?

[A] low-frequency infrasound
[B] high-frequency ultrasound
[C] sounds between 200 Hz and 400 Hz
[D] None of the above

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69. What will be the apparent frequency when the both source of the sound and listener move in the same direction with same velocity?

[A] it will be more than the actual frequency
[B] it will be less than the actual frequency
[C] it will be equal to the actual frequency
[D] None

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70. In which of the following cases Doppler effect is not seen?

[A] When the velocity of source and listener is equal to or greater than the sound velocity
[B] When source and listener moves in opposite direction
[C] When the velocity of source and listener is less than the sound velocity
[D] None of the above

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