Q51. The working of the quartz crystal in the watch is based on the
[A] Photoelectric Effect
[B] Piezo – electric Effect
[C] Johnson Effect
[D] Edison Effect
Q52. A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
[A] have its shape changed
[B] increase
[C] decrease
[D] remain unaffected
Q53. The direction of heat flow between two objects depends on
[A] Their temperatures
[B] Whether they are in solid, liquid or gaseous state
[C] Their heat contents
[D] Their masses
Q54. An object at rest may have
[A] Potential energy
[B] Velocity
[C] Kinetic energy
[D] Momentum
600+ Physics Quiz Questions and Answers
Q55. When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of
[A] diffusion
[B] viscosity
[C] capillarity
[D] surface tension
Q56. If a sound travels from air to water, the quantity that remain unchanged is
[A] wavelength
[B] amplitude
[C] frequency
[D] velocity
Q57. Masses of stars and galaxies are usually expressed in terms of
[A] solar mass
[B] lunar mass
[C] neutron mass
[D] earth’s mass
Q58. If the velocity of a body is doubled its kinetic energy
[A] becomes 1/4 th
[B] become 4 times
[C] becomes half
[D] is also doubled
Q59. Skating on ice is possible because
[A] ice is cold
[B] the pressure on the ice due to skate raises its melting point
[C] the surface of ice is smooth
[D] the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
Q60. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
[A] there is no air or any other gas in the bell jar
[B] the bell jar is too small
[C] the glass of the bell jar absorbs the sound waves
[D] the ringing is not loud enough