Physics : General Knowledge Questions and Answers

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