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Mechanics

219 MCQ questions with answers and explanations · page 5 of 9

Test yourself▶ 25 question test▶ 50 question test

Q101. Energy is produced in the Sun by-

  1. Aby nuclear fission
  2. Bby nuclear fusion
  3. Cby oxidation reactions
  4. Dby reduction reactions
Show answer & explanation

Answer: B) by nuclear fusion

Q102. The energy of the sun is produced by-

  1. Aby ionization
  2. Bby nuclear fusion
  3. Cby nuclear fission
  4. Dby oxygen
Show answer & explanation

Answer: B) by nuclear fusion

Q103. Dynamo converts-

  1. Ahigh voltage to low voltage
  2. Belectrical energy into mechanical energy
  3. Cmechanical energy into electrical energy
  4. Dlow voltage to high voltage
Show answer & explanation

Answer: C) mechanical energy into electrical energy

Q104. Which of the following is produced by converting solar energy using photovoltaic cells?

  1. Aoptical energy
  2. Belectrical energy
  3. Cthermal energy
  4. Dmechanical energy
Show answer & explanation

Answer: B) electrical energy

Q105. When we sit or lie down on a rubber-padded seat, its shape changes. Such materials are found in-

  1. Akinetic energy
  2. Bpotential energy
  3. CStored energy
  4. Dfission energy
Show answer & explanation

Answer: B) potential energy

Q106. Which of the following does not have kinetic energy?

  1. Afired bullet
  2. Brushing water
  3. CMoving Hammer
  4. Ddrawn bow
Show answer & explanation

Answer: D) drawn bow

Q107. When the speed of a moving object doubles, its kinetic energy-

  1. Adoubles up
  2. Bquadruples
  3. Cremains the same
  4. Dincreases threefold
Show answer & explanation

Answer: B) quadruples

Q108. Climbing stairs consumes more energy because-

  1. AThe person works against gravity.
  2. Ba person works against gravity
  3. CThe person acts in the direction of gravity
  4. DThe person does not do any work
Show answer & explanation

Answer: B) a person works against gravity

Q109. Which of the following laws justifies the statement that matter can neither be created nor destroyed?

  1. Alaw of conservation of energy
  2. BLe Chatelier's law
  3. CLaw of conservation of mass
  4. Dlaw of osmosis
Show answer & explanation

Answer: A) law of conservation of energy

Q110. The use of hydraulic banks in autonomous vehicles is actually a direct application of which law?

  1. APascal's law
  2. BTorricelli's law
  3. CArchimedes' principle
  4. DNewton's law
Show answer & explanation

Answer: A) Pascal's law

Q111. Why are railway tracks banked on their banks?

  1. AThe horizontal component of the train's weight can be used to obtain the required centrifugal force.
  2. BNo frictional force can be generated between the wheels of the train and the tracks.
  3. CThe horizontal component of the train's weight can be used to obtain the required centripetal force.
  4. DThe train could not fall inwards
Show answer & explanation

Answer: C) The horizontal component of the train's weight can be used to obtain the required centripetal force.

Q112. Why does a cyclist lean while taking a turn?

  1. AWhy does a cyclist lean while taking a turn?
  2. BIt tilts so that the center of gravity remains within the base, preventing it from falling
  3. CIt tilts to apply pressure to the wheels to travel along a curved path
  4. DHe swerves to get around the curve faster
Show answer & explanation

Answer: B) It tilts so that the center of gravity remains within the base, preventing it from falling

Q113. If a cyclist turns around a bend, he-

  1. Abends outward
  2. Bbends inward
  3. Cforward bends
  4. DDoes not bend at all
Show answer & explanation

Answer: B) bends inward

Q114. When milk is churned vigorously, why does the cream separate from it?

  1. Acentrifugal force
  2. Bcentripetal force
  3. Cgravitational force
  4. Dfriction force
Show answer & explanation

Answer: A) centrifugal force

Q115. When milk is churned vigorously, why does the cream separate from it?

  1. AWhen milk is churned vigorously, why does the cream separate from it?
  2. BThe centrifugal force is less than the weight of the water.
  3. CThe weight of water at the highest position of the bucket is reduced by
  4. DThe cohesive force between the water and the bucket is greater
Show answer & explanation

Answer: A) When milk is churned vigorously, why does the cream separate from it?

Q116. The working principle of a washing machine is—

  1. Asubstation
  2. Bdialysis
  3. CCentrifugation
  4. Ddiffusion
Show answer & explanation

Answer: C) Centrifugation

Q117. What is the reason for the absence of atmosphere on the Moon?

  1. AIt is near the Earth
  2. BIt receives light from the sun.
  3. CIt revolves around the Earth
  4. DThe escape velocity of gas molecules on it is less than their root mean square velocity.
Show answer & explanation

Answer: D) The escape velocity of gas molecules on it is less than their root mean square velocity.

Q118. Which of the following works on the basis of conservation of linear force?

  1. ARocket
  2. Bhelicopter
  3. CJet
  4. Dplane
Show answer & explanation

Answer: C) Jet

Q119. Which of the following works on the basis of conservation of linear force?

  1. A11.2km/s
  2. B11.2m/s
  3. C11.2 km/h
  4. D10.2m/s
Show answer & explanation

Answer: A) 11.2km/s

Q120. The time period of a geostationary satellite is-

  1. A9 hours
  2. B12 hours
  3. C24 hours
  4. D28 hours
Show answer & explanation

Answer: C) 24 hours

Q121. If a body is thrown from the earth with a velocity of 11.2 km/s, then the body-

  1. Awill never return to Earth
  2. Bwill return in 2 hours
  3. Cwill return after 24 hours
  4. DNothing is certain
Show answer & explanation

Answer: A) will never return to Earth

Q122. When a stone is brought from the surface of the moon to the earth, then-

  1. Aits mass will change
  2. BIts weight will change, but not its mass.
  3. CBoth weight and mass will change.
  4. DNeither mass nor weight will change
Show answer & explanation

Answer: B) Its weight will change, but not its mass.

Q123. When does a person sitting in a lift feel that his weight is more?

  1. AWhen the lift is coming down at an accelerated speed
  2. BWhen the lift is moving upwards at an accelerated speed
  3. Cdescending with the same velocity
  4. Dgoing up with the same velocity
Show answer & explanation

Answer: B) When the lift is moving upwards at an accelerated speed

Q124. The ball dropped from an artificial satellite revolving around the Earth is-

  1. Awill go to earth
  2. Bwill go to the moon
  3. Cwill fall to the earth
  4. DIt will continue to revolve around the Earth in its orbit with the same periodicity as the satellite
Show answer & explanation

Answer: D) It will continue to revolve around the Earth in its orbit with the same periodicity as the satellite

Q125. The apparent weight of a person in a lift is less than the actual weight when the lift is going

  1. Aup with acceleration
  2. Bdown with acceleration
  3. Cup with the same speed
  4. Ddown at the same speed
Show answer & explanation

Answer: B) down with acceleration

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