GK-Physics Question and Answer
GK-Physics Question and Answer
71. Planets are
- luminous heavenly bodies revolving around a star
- non-luminous heavenly bodies
- luminous heavenly bodies that twinkle
- luminous heavenly bodies that do not twinkle
72. Mica is used in electrical appliances such as electric iron because mica is
- a good conductor of heat but a bad conductor of electricity
- a bad conductor of heat but a good conductor of electricity
- a good conductor of heat as well as electricity
- a bad conductor of heat as well as electricity
73. It is easier to roll a barrel full of coal tar than to pull it because
- the full weight of the barrel comes into play when it is pulled
- the rolling friction is much less than the sliding friction
- more surface area of the barrel is in contact with the road when it is pulled
- coal tar is a liquid and it flows in the barrel when it is rolled
74. Minimum number of unequal vectors which can give zero resultant are
- two
- three
- four
- more than four
75. Intensity of sound has
- an object existence
- a subject existence
- no existence
- both subjective and objective existence
76. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
- east
- west
- northeast
- southeast
77. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
- 1200 m
- 0.33 km
- 3.33 km
- 33 km