Class VII

A force which opposes motion is known as
  1. friction
  2. gravity
  3. pull
  4. push
Force of attraction between two masses is called
  1. gravitational force
  2. friction
  3. pull
  4. push
Density has SI unit which is
  1. kilogram per cubic meter
  2. gram per cubic meter
  3. meter per kilogram
  4. meter per cubic meter
When upthrust is equal to weight of object then it
  1. floats
  2. sinks
  3. moves
  4. stops
Force of friction can be reduced by help of
  1. ball bearing
  2. lubricants
  3. cushion surfaces
  4. all of them
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