Class VIII

The shape of the airplane is like a
  1. bird
  2. car
  3. dog
  4. all
Fluid are
  1. gas
  2. Liquids
  3. Gases and liquids both
  4. None of these
On what force of friction depends?
  1. Smoothness of surface
  2. Roughness of surface
  3. Inclination of surface
  4. All of these
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
Which of the following statement is NOT true?
  1. Friction make the things slow down
  2. Friction produces heat.
  3. Friction can stop the moving object.
  4. Friction is not useful.
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