CBSE  /  Class 8  /  Science  /  Friction

  • 1. 
    This type of friction is the most powerful of all types of frictions:

  • static
  • rolling
  • sliding
  • drag

  • 2. 
    When two objectives are already moving the friction between them is called:

  • rolling friction
  • static friction
  • sliding friction
  • friction of fluid

  • 3. 
    Ball-bearings are used to convert static friction into:

  • drag
  • sliding friction
  • rolling friction
  • none of these

  • 4. 
    To convert the static, sliding friction into rolling friction, the heavy luggage carriers are attached with at their base.

  • ball-bearings
  • chains
  • tyres
  • wheels

  • 5. 
    Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below - Choose the correct arrangement:

  • rolling, static, sliding
  • rolling, sliding, static
  • static, sliding, rolling
  • sliding, static, rolling

  • 6. 
    Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:

  • wet marble floor, dry marble floor, newspaper and towel
  • newspaper, towel, dry marble floor, wet marble floor
  • towel, newspaper, dry marble floor, wet marble floor
  • wet marble floor, dry marble floor, towel, newspaper

  • 7. 
    The force of friction between two bodies is:

  • parallel to the contact surface
  • inclined at 30° to the contact surface
  • perpendicular to the contact surface
  • inclined at 60° to the contact surface

  • 8. 
    A coin pushed on a table stops because:

  • no force acts on it
  • it is very heavy
  • the table exerts a frictional force on it
  • the earth attracts it

  • 9. 
    The main cause of wear and tear of machine is:

  • poor quality of machine
  • friction acting between different moving parts
  • gravitational force of earth
  • none of these

  • 10. 
    Ball rolling on the floor stops due to:

  • muscular force
  • gravitational force
  • magnetic force
  • frictional force
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