physics MCQs – Page 6

Practise multiple-choice questions from physics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

physics Mcqs
101. Momentum depends upon__________________?
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A. force acts on the body

B. mass of the body

C. velocity of the body

D. both mass and velocity of the body
102. A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
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A. 500 mm

B. 2 x 10-3 mm

C. 2 x 10-5 mm

D. 5 x 10-3 mm

103. A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
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A. 5 m

B. 25 m

C. 14 m

D. 20 m

104. The resistance of a conductor at absolute zero (OK) is________________?
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A. zero almost

B. no prediction at all

C. infinite almost

D. may increase or decrease

105. Optical active crystals rotates the __________________?
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A. diffraction plane

B. interference plane

C. polarization plane

D. vibrating plane

106. The speed of sound in hydrogen is _____________ time than that in oxygen?
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A. Four time

B. Six time

C. Two times

D. Three times

107. One kilowatt hour is the amount of energy delivered during _______________?
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A. one hour

B. one day

C. one minute

D. one second

108. Distance covered by a freely falling body in 2 seconds will be__________________?
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A. 39.2 m

B. 4.9 m

C. 44.1 m

D. 19.6 m
109. The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?
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A. 1

B. -1

C. 2

D. -2

110. Name the branch of science which deals with the study of sound and sound waves?
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A. Aetiology

B. Acoustics

C. Aerostatics

D. Aeronautics

111. Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?
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A. isochoric law

B. adiabatic law

C. isothermal law

D. all of the above

112. When velocity time graph is a straight line parallel to time axis then__________________?
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A. acceleration is const

B. acceleration is variable

C. velocity is zero

D. acceleration is zero
113. Time rate of change of momentum is equal to____________________?
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A. force

B. impulse

C. velocity

D. both A and C

114. A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________?
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A. becomes zero

B. remains the same

C. is doubled

D. is halved

115. Newton estimated the speed of sound _____________________?
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A. 281m/sec

B. 333m/sec

C. 340m/sec

D. all of the above

116. A body is moving with uniform velocity. Its______________________?
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A. displacement from origin changes

B. direction of motion changes

C. acceleration changes

D. speed changes

117. Silence zone takes place due to____________________?
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A. beats

B. resonance

C. destructive interference

D. constructive interference

118. The normal ear is the most sensitive in the frequency range___________________?
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A. 20000 to 30000 hertz

B. 2000 to 4000 hertz

C. 6000 to 8000 hertz

D. 10 to 20 hertz

119. According to Einstein light travels form one place to another in the form of ________________?
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A. particles

B. photons

C. it was not his discovery

D. waves

120. When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are________________?
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A. 5m/s, 1m/s

B. 3m/s, 3m/s

C. 4m/s, 2m/s

D. 6m/s, 1m/s