Class VIII

Lubricants
  1. Increase friction
  2. Reduce friction
  3. Both (a) and (b)
  4. None
Friction always acts __________ the direction of motion of an object
  1. in the same direction as
  2. perpendicular to
  3. opposite to
  4. at 45 degrees angle to
Fluid are
  1. gas
  2. Liquids
  3. Gases and liquids both
  4. None of these
On which of the following toy car will travel the farthest?
  1. Wet marble floor
  2. Dry marble floor
  3. Newspaper
  4. Carpet
On what force of friction depends?
  1. Smoothness of surface
  2. Roughness of surface
  3. Inclination of surface
  4. All of these
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