CBSE  /  Class 8  /  Science  /  Friction

  • 1. 
    The hinges of creaking doors are oiled to:

  • keep them clean
  • open and close them easily
  • reduce noise and wears and tear
  • none of these

  • 2. 
    A matchstick catches fire when struck against the side of the matchbox because:

  • of the chemicals

  • 3. 
    Which of the following is true about friction:

  • Friction can only slow things down
  • Friction is a force that only occurs when an object moves
  • Friction is a force that only occurs on rough surfaces
  • Friction is a force that occurs only between solids

  • 4. 
    Talcum powder should not be spilled on the floor of room because:

  • it will stain the floor
  • it may cause us to slip and fall
  • it is messy
  • none of these

  • 5. 
    The easiest way to move a heavy wooden crate is to:

  • place it on a trolley
  • tie a rope one end and pull
  • push it
  • none of these

  • 6. 
    The two common forces that are acting everywhere around us are:

  • gravity and friction
  • gravity and magnetic force
  • electrostatic force and gravity
  • friction and magnetic force

  • 7. 
    If we apply the force along the right, the friction acts along the:

  • right direction
  • left direction
  • can’t say
  • none of these

  • 8. 
    Which of the following is true:

  • We write on a paper with pen due to friction
  • A nail is fixed in the wall due to friction
  • Soles of shoes wear out due of friction
  • All of these

  • 9. 
    Gymnasts apply some coarse substance on their hands to:

  • increase friction for better grip
  • decrease friction
  • play fast
  • none of these

  • 10. 
    In which of the following friction is troublesome:

  • sharpening a knife by rubbing it against a stone
  • applying the brekes to stop a cycle.
  • walking on a wet road
  • rubbing the matchstick with the side of matchbox before burning it
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