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.

81. Which of the following is correct about mechanical waves?

[A] they require a medium to propagate
[B] they don’t require a medium to propagate
[C] may or may not require a medium to propagate
[D] None of the above

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82. Which of the following waves are also called as heat waves?

[A] UV rays
[B] X-rays
[C] Infrared
[D] Micro waves

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83. What is the audible range of sound for human beings?

[A] 20 Hz to 2000 Hz
[B] 200 Hz to 20000 Hz
[C] 20 Hz to 20000 Hz
[D] 2000 Hz to 20000 Hz

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84. What are infrasonic sounds?

[A] Sounds of frequencies below 20 Hz
[B] Sounds of frequencies above 20 Hz
[C] Sounds of frequencies below 200 Hz
[D] Sounds of frequencies above 20 Hz

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85. 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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86. 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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87. Which of the following is the cause of echo?

[A] When sound is absorbed
[B] When sound is transmitted
[C] When sound is reflected
[D] When sound is refracted

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88. Which of these parts of the ear responds to sound waves like a microphone’s diaphragm?

[A] eardrum
[B] lobe
[C] fluid in the inner ear
[D] pinna

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89. Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

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90. Which of the following is correct about a Sound wave?

[A] It is a mechanical wave
[B] It is an electromagnetic wave
[C] It is both a mechanical and electromagnetic wave
[D] It is neither a mechanical nor an electromagnetic wave

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