Olympiad – Class VIII – Science - Phy - Friction

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Question - 1

What type of a force is friction?

  • A Contact force
  • B Non-contact force
  • C Electrostatic force
  • D Magnetic force

Question - 2

What is the value of sliding friction for an object which requires 7 N of force to move it from rest?

  • A 7 N
  • B Greater than 7 N
  • C Less than 7 N
  • D 14 N

Question - 3

Which of the following materials is likely to have the least friction?

  • A Wood
  • B Cardboard
  • C Glass
  • D Paper

Question - 4

Which of the following reduces friction in a rotating machine?

  • A Wheels
  • B Rollers
  • C Ball bearings
  • D Handle

Question - 5

In which of the following cases is friction desirable?

  • A Movement of piston in a cylinder
  • B A vehicle speeding
  • C Running on a track
  • D All of the above

Question - 6

Why is a carrom board usually powdered before playing?

  • A For increasing friction
  • B For decreasing friction
  • C For decoration
  • D For fragrance

Question - 7

Which of the following statements is correct?

  • A Rolling is easier than sliding.
  • B Sliding is easier than rolling.
  • C Dragging is easier than sliding.
  • D Dragging is easier than rolling.

Question - 8

What is the frictional force exerted by fluids called?

  • A Lift
  • B Drag
  • C Rolling friction
  • D Dynamic Friction

Question - 9

Why are certain bodies streamlined?

  • A To increase friction
  • B To decrease weight
  • C To reduce friction
  • D To increase weight

Question - 10

In the decreasing order of magnitude, which of the following is correct?

  • A Rolling < static < sliding friction
  • B Static> sliding> rolling friction
  • C Static> rolling> sliding friction
  • D Sliding < static < rolling friction