Physics MCQs with answers Page - 19

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Q. The force which makes a vehicle to stop when break is applied is called

  • (A) Gravitational force
  • (B) Vanderwalls force
  • (C) Frictional force
  • (D) Covalant force

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Q. What James Watt invented?

  • (A) Diving bell
  • (B) Steam boat
  • (C) Hot air balloon
  • (D) Rotary steam engine

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Q. Vehicle tyres are inflated properly

  • (A) To ensure smooth running.
  • (B) To allow the vehicle to take more load.
  • (C) To avoid skidding and to minimise friction
  • (D) To go fast and save fuel.

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Q. Friction is caused by the ________ on the two surfaces in contact.

  • (A) Irregularities
  • (B) Smoothness
  • (C) Densities
  • (D) Gaps

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Q. Ball bearings are used in cycles, scooters etc to

  • (A) Increase the friction between the wheel and the axle
  • (B) Reduce the friction between the wheel and the axle
  • (C) Reduce the friction between ground and the whee
  • (D) None of the above

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Q. The force of friction between two surfaces will increase if:

  • (A) A layer of lubricant is kept between the two surfaces
  • (B) The two surfaces are pressed harder
  • (C) Air gap is created between the two surfaces
  • (D) Irregularities on both the surfaces are removed

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Q. Rolling friction is caused by ________

  • (A) Non-elastic effects
  • (B) Gravity
  • (C) Power dissipation
  • (D) Buoyancy

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Q. In a railway track, two rails are joined end to end with a gap in between them because

  • (A) Steel can be saved
  • (B) Accidents due to contraction in winter can be avoided
  • (C) Air-gaps are necessary for bearing the weight of running train
  • (D) Accidents due to expansion in summer can be avoided

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Q. Air coolers are more suitable for

  • (A) Hot and humid climate
  • (B) Hot and dry climate
  • (C) Cool and humid climate
  • (D) Cool and dry climate

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Q. We feel cool when we sit near the fan, this is because

  • (A) Fan gives cool air.
  • (B) Fan cools surrounding air.
  • (C) Air vapourises the sweat on our body.
  • (D) We feel cool when air touches the body.

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