physics MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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
121. The velocity of sound in air would become double than its velocity at 0C at temperature________________?
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A. 819C

B. 313C

C. 1172C

D. 586C

122. Beats are the results of____________________?
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A. constructive and destructive interference

B. polarization

C. diffraction of sound waves

D. destructive interference

123. In liquids and gases the current is due to the motion________________?
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A. negative charges

B. positive charges

C. both negative and positive charges

D. neutral particles

124. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many hours will they meet?
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A. 2

B. 2.5

C. 1.75

D. 1.5

E. 1.25

125. In a plane polarized light _________________?
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A. vibration take place in a direction perpendicular to the direction of propagation of light

B. no vibration at all

C. vibration in two mutually perpendicular directions

D. vibration in all direction

126. When the source of sound moves away form a stationary listener then ______________ occurs?
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A. no apparent change in frequency

B. an apparent decrease in frequency

C. an apparent decrease in wavelength

D. an apparent increase in frequency

127. Which shows the correct relation between time of flight T and maximum height H ?
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A. H=gT2/8

B. H=gT2

C. H=8g/T2

D. H=8T2/g

128. If stretching force T of wire increases, then its frequency __________________?
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A. remains the same

B. increases

C. decreases

D. any of above

129. Internal resistance is the resistance offered by________________?
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A. capacitor

B. resistor

C. conductor

D. source of EMF
130. Resistance of an ideal insulator is __________________?
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A. zero

B. depends upon nature

C. infinite

D. finite

131. The waves that require a material medium for their propagation are called__________________?
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A. carrier waves

B. electromagnetic waves

C. mechanical waves

D. matter waves

132. Doppler effect applies to____________________?
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A. sound wave only

B. light wave only

C. both sound and light waves

D. neither sound nor light wave

133. Which is not optically active ?
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A. water

B. tartaric acid

C. sugar

D. sodium chlorate

134. A wire having very high value of conductance is said to be____________________?
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A. no specific criterion available

B. an insulator

C. very good conductor

D. moderately good conductor

135. Newtons laws do not hold good for particles_______________?
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A. move with high velocity

B. moving slowly

C. move with velocity comparable to velocity of light

D. at rest

136. Increase in velocity of sound in the air for 1C rise in temperature is_________________?
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A. 61.0 ms-1

B. 1.61 ms-1

C. 2.00 ms-1

D. 0.61 ms-1
137. In vibrating cord the points where the amplitude is maximum, are called ___________________?
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A. antinodes

B. troughs

C. nodes

D. crests

138. The thrust on the rocket in the absence of gravitational force of attraction is__________________?
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A. constant if the rate of ejected gases is constant

B. not constant

C. constant for short range rocket.

D. Constant
139. Velocity of sound in vacuum is ____________________?
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A. 320 ms-1

B. Zero

C. 224 ms-1

D. 332 ms-1

140. Electrical energy is measured in___________________?
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A. watt

B. kilowatt hour

C. horse power

D. kilo watt