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
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

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
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

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

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

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

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

142. In double slit experiment we observe _____________________?
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A. interference fringes only

B. diffraction fringes only

C. both interference and diffraction fringes

D. polirized frringes

144. Sound waves do not travel in vacuum because ___________________?
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A. they are transverse waves

B. they require material medium for propagation

C. they do not have enough energy

D. they are stationary waves

145. Resistance of a super conductor is ______________________?
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A. infinite

B. changes with every conductor

C. zero

D. finite

146. Two sources of light are coherent if they emit rays of_______________?
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A. same wavelength

B. same wave length with constant phase difference

C. same amplitude and wavelength

D. same amplitude of vibration