Class VII

Mass of a substance per unit volume is called its
  1. weight
  2. density
  3. volume
  4. gravity
If an object is at rest then forces are
  1. balanced
  2. unequal
  3. higher
  4. lower
Force of friction can be reduced by help of
  1. ball bearing
  2. lubricants
  3. cushion surfaces
  4. all of them
A force can be measured by help of
  1. focimeter
  2. spring balance
  3. both a and b
  4. pane balance
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
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