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Mechanics

219 MCQ questions with answers and explanations · page 3 of 9

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Q51. Why does a cricket player pull his hand back to catch a fast-moving ball?

  1. AThe ball can come to rest
  2. BBall can remain in accelerated state
  3. CHe may need to apply less force
  4. DHe may need to apply more force
Show answer & explanation

Answer: A) The ball can come to rest

Q52. The force product is-

  1. Aof mass and velocity
  2. Bof mass and acceleration
  3. Cof weight and bag
  4. Dof load and acceleration
Show answer & explanation

Answer: B) of mass and acceleration

Q53. When a person lands on the moon, the substances present in his body-

  1. Athe amount of matter changes
  2. Bweight decreases and volume remains unchanged
  3. Cchanges in load
  4. DThere is a decrease in both volume and weight
Show answer & explanation

Answer: B) weight decreases and volume remains unchanged

Q54. If we move from the equator towards the poles, then the value of g-

  1. Aincreases
  2. Bdecreases
  3. Cremains the same
  4. DDecreases up to 45° latitude
Show answer & explanation

Answer: A) increases

Q55. body weight-

  1. AIt is the same everywhere on the Earth's surface.
  2. BIt is maximum at the poles.
  3. Cis maximum at the equator
  4. DIt is more prevalent on hills than on plains
Show answer & explanation

Answer: B) It is maximum at the poles.

Q56. Why can a person jump higher on the surface of the Moon than on the surface of the Earth?

  1. AThe surface of the Moon is rough
  2. Bthe moon has no atmosphere
  3. CThe acceleration due to gravity on the Moon is less than on the Earth.
  4. DThe moon is colder than the earth.
Show answer & explanation

Answer: C) The acceleration due to gravity on the Moon is less than on the Earth.

Q57. The work done to hold a 20 kg weight at a height of 1 m above the ground is

  1. A20 joules
  2. B200 joules
  3. C981 joules
  4. DZero Joules
Show answer & explanation

Answer: D) Zero Joules

Q58. A person pushes a wall but fails to displace it, then he does-

  1. ANo work whatsoever
  2. Bnegative work
  3. Cpositive but not maximum work
  4. DMaximum work
Show answer & explanation

Answer: A) No work whatsoever

Q59. A person climbing a hill leans forward because-

  1. Acan walk fast
  2. BReduce the chance of slipping
  3. Cto conserve power
  4. DTo increase durability
Show answer & explanation

Answer: D) To increase durability

Q60. The historic Leaning Tower of Pisa does not fall despite being tilted, because-

  1. AThe vertical line from its center of gravity passes through the base
  2. BThe vertical line through its centre of gravity does not pass through the base
  3. CThere is divine influence behind this.
  4. DThis is a surprise
Show answer & explanation

Answer: A) The vertical line from its center of gravity passes through the base

Q61. Water pipes burst when it gets extremely cold during winter nights because-

  1. AThe density of water decreases after freezing
  2. BAfter freezing, water becomes hard and hence its hardness breaks the pipes.
  3. CThe volume of water increases after freezing.
  4. DThe metal of the water pipe melts after freezing.
Show answer & explanation

Answer: C) The volume of water increases after freezing.

Q62. A corked bottle filled with water will break on freezing because-

  1. AThe bottle shrinks when frozen
  2. BThe volume of water decreases when it freezes
  3. CThe volume of water increases when it freezes
  4. Dglass is a bad conductor of heat
Show answer & explanation

Answer: C) The volume of water increases when it freezes

Q63. What will be the change in the volume of water if the temperature is dropped from 9°C to 3°C?

  1. AThere will be no change in volume
  2. BThe volume will first increase and then decrease
  3. CThe volume will first decrease and then increase
  4. Dthe water will freeze
Show answer & explanation

Answer: C) The volume will first decrease and then increase

Q64. For a steel boat floating in a lake, what is the weight of the water displaced by the boat?

  1. Aless than the boat's weight
  2. Bmore than the weight of the boat
  3. Cequal to the weight of that part of the boat which is below the surface of the lake water
  4. Dequal to the weight of the boat
Show answer & explanation

Answer: C) equal to the weight of that part of the boat which is below the surface of the lake water

Q65. If a carpet is beaten with a stick to clean it, which rule applies to it?

  1. Afirst law of motion
  2. Bsecond law of motion
  3. Cthird law of motion
  4. DCombination of the first and second laws of motion
Show answer & explanation

Answer: A) first law of motion

Q66. It is more difficult to walk on snow than on the road because-

  1. AThe snow is harder than the road
  2. BThe road is hard with snow
  3. CThe snow does not react when we push it with our feet.
  4. DIce has less friction than road.
Show answer & explanation

Answer: D) Ice has less friction than road.

Q67. It is more difficult to walk on ice than on a gravel road because-

  1. AIce is soft and spongy while gravel is hard.
  2. BThe frictional force between the foot and the ice is less than the frictional force between the gravel and the foot.
  3. CThe friction force on ice is greater than on gravel
  4. Dnone of the above
Show answer & explanation

Answer: B) The frictional force between the foot and the ice is less than the frictional force between the gravel and the foot.

Q68. It is easier to roll a wooden cylindrical barrel than to drag it because-

  1. AWhen it is pulled, the weight of the object acts
  2. BThe force of friction in the rolling state is much less than the force of friction in the sliding state.
  3. CThe barrel has a larger surface area in contact with the road when towing.
  4. DAny option other than the above
Show answer & explanation

Answer: B) The force of friction in the rolling state is much less than the force of friction in the sliding state.

Q69. When a ship moving in a river reaches the sea, the level of the ship-

  1. Aas much as before
  2. Bwill come up a little
  3. Cwill come down a little
  4. Dwill move up or down depending on the load it carries
Show answer & explanation

Answer: B) will come up a little

Q70. Why does an iron nail float in mercury, while it sinks in water?

  1. AThe tendency of iron to react chemically with mercury is due to comparison with water.
  2. BIron weighs more than water and less than mercury
  3. CThe density of iron is greater than that of water and less than that of mercury.
  4. Dmercury is heavier than water
Show answer & explanation

Answer: C) The density of iron is greater than that of water and less than that of mercury.

Q71. When a solid body is immersed in water, its weight decreases. By how much is this loss?

  1. Aequal to the weight of the displaced water
  2. Bless than the weight of the displaced water
  3. Cmore than the weight of the displaced water
  4. DNot related to the weight of the displaced water
Show answer & explanation

Answer: A) equal to the weight of the displaced water

Q72. Ice floats in water but sinks in alcohol because-

  1. AWater is more transparent than alcohol
  2. BIce is formed by the freezing of water
  3. CIce is a solid while alcohol is a liquid
  4. DIce is lighter than water and heavier than alcohol
Show answer & explanation

Answer: D) Ice is lighter than water and heavier than alcohol

Q73. A steel bullet floats in mercury because-

  1. ANothing can sink in mercury.
  2. BMercury has a higher density than steel.
  3. CThe density of steel is greater than that of mercury.
  4. DThe bullet cannot float
Show answer & explanation

Answer: B) Mercury has a higher density than steel.

Q74. If an iron ball is dropped in a bucket filled with mercury, then-

  1. AIt will settle to the bottom of the bucket.
  2. BIt will float on the surface of the mercury.
  3. Cit will dissolve
  4. Dnone of the above
Show answer & explanation

Answer: B) It will float on the surface of the mercury.

Q75. At what temperature is the density of water maximum?

  1. A0°C
  2. B1°C
  3. C2°C
  4. D4°C
Show answer & explanation

Answer: D) 4°C

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