Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, NDA, CDS and all one day examinations of India.

31. A hydrogen-inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, what will happen to its shape and size? (UPSC Prelims 2003)
[A] Decrease in size
[B] Flatten into a disc-like shape
[C] Increase in size
[D] maintain the same size and shape

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32. An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration, How the free surface of oil behaves? (UPSC Prelims 2003)
[A] Remains horizontal
[B] It inclined to the horizontal with smaller depth at the rear end
[C] It inclined to the horizontal with larger depth at the rear end
[D] Assumes parabolic curve

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33. Which among the following methods is used in the nuclear power reactors to produce energy for peaceful purpose?
[A] Nuclear fusion
[B] Nuclear fission
[C] Radioactive decay
[D] None of the above

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34. Which among the following is not a vector quantity?
[A] Speed
[B] Velocity
[C] Acceleration
[D] Displacement

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35. What happens to the density of water when it freezes?
[A] Decreases
[B] Becomes Zero
[C] Remains constant
[D] Increases

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36. The absolute zero is a temperature at which__?
[A] molecular motion in a gas would cease
[B] water freezes
[C] all gases become liquid
[D] all gases become solid

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37. Newton-meter (Nm) is the SI unit of which of the following physical quantity?
[A] Acceleration
[B] Torque
[C] Power
[D] Force

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38. The rate of change of displacement with time is known as__:
[A] Force
[B] Acceleration
[C] Retardation
[D] Velocity

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39. Decibel is the unit used for__:
[A] Speed of light
[B] Intensity of heat
[C] Intensity of sound
[D] Radio wave frequency

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40. A spherical ball made of steel when dropped in mercury container__:
[A] It will sink in mercury
[B] It will be on the surface of mercury
[C] It will be partly immersed mercury
[D] It will dissolve in mercury

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