In order to reduce air and water resistance, objects are shaped in

  • streamline
  • oblongata
  • rectangular
  • conical

A substance will float on surface of water if its density is less than

  • liquid
  • gas
  • both a and b
  • aqueous

A force which opposes motion is known as

  • friction
  • gravity
  • pull
  • push

Force can be measured by the help of

  • foci meter
  • spring balance
  • pane balance
  • both a and b

Force can make a stationary object to

  • move
  • rotate
  • spin
  • still

Forces can easily change the

  • direction of an object
  • gravity of an object
  • density of an object
  • volume of an object

The gravitational force which acts on a body, is called

  • mass
  • weight
  • size
  • load
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