Physics Questions and Answers

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Q71
Planets are
  • A luminous heavenly bodies revolving around a star
  • B non-luminous heavenly bodies
  • C luminous heavenly bodies that twinkle
  • D luminous heavenly bodies that do not twinkle
Answer: Option B
Q72
Mica is used in electrical appliances such as electric iron because mica is
  • A a good conductor of heat but a bad conductor of electricity
  • B a bad conductor of heat but a good conductor of electricity
  • C a good conductor of heat as well as electricity
  • D a bad conductor of heat as well as electricity
Answer: Option A
Q73
It is easier to roll a barrel full of coal tar than to pull it because
  • A the full weight of the barrel comes into play when it is pulled
  • B the rolling friction is much less than the sliding friction
  • C more surface area of the barrel is in contact with the road when it is pulled
  • D coal tar is a liquid and it flows in the barrel when it is rolled
Answer: Option B
Q74
Minimum number of unequal vectors which can give zero resultant are
  • A two
  • B three
  • C four
  • D more than four
Answer: Option B
Q75
Intensity of sound has
  • A an object existence
  • B a subject existence
  • C no existence
  • D both subjective and objective existence
Answer: Option A
Q76
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
  • A east
  • B west
  • C northeast
  • D southeast
Answer: Option A
Q77
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
  • A 1200 m
  • B 0.33 km
  • C 3.33 km
  • D 33 km
Answer: Option C

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