Physics Page-3

21) Tube light works on the principle of
(A) Chemical effect of current
(B) Heating effect of current
(C) Magnetic effect of current
(D) Discharge of electricity through gases

22) In a refrigerator, cooling is produced by
(A) The ice which deposits on the freezer
(B) The evaporation of a volatile liquid
(C) The sudden expansion of a compressed gas
(D) None of the above

23) Air is completely removed from an electric bulb to prevent
(A) Oxidation of tungsten filament
(B) Bursting of the bulb
(C) Loss of light due to absorption
(D) None of the above

24) A person climbing a hill bends forward in order to
(A) Avoid slipping
(B) Increase speed
(C) Reduce fatigue
(D) Increase stability

25) On earth a moving body ordinarily comes to rest by itself because of the
(A) Law of inertia
(B) Forces of friction
(C) Conservation of momentum
(D) Gravity

26) When the door of an operating refrigerator is opened the temperature of the room will
(A) Decrease
(B) Remain unchanged
(C) Fall down immediately
(D) Increase

27) An electric motor is used to convert
(A) Electrical energy into mechanical energy
(B) Mechanical energy into kinetic energy
(C) Mechanical energy into electrical energy
(D) Higher voltage to lower voltage

28) Two parallel wires carrying currents in the same direction attract each other because of
(A) Potential difference between them
(B) Mutual inductance between them
(C) Electric forces between them
(D) Magnetic forces between them

29) Energy of a body due to its motion is called
(A) Heat energy
(B) Kinetic energy
(C) Potential energy
(D) Light energy

30) A moving ball stops due to the action of
(A) Nuclear Force
(B) Frictional Force
(C) Electric Force
(D) Magnetic Force



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