Home / General Knowledge / Physics :: section - 4

General Knowledge :: Physics

  1. Friction can be reduced by changing from

  2. A.

     Static to Dynamic

    B.

     Rolling to Sliding

    C.

     Dynamic to Static

    D.

     Sliding to Rolling

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. It is more difficult to walk on ice than on a concrete road because

  4. A.

     There is very little friction between the ice and feet pressing it

    B.

     Ice is soft when compared to concrete

    C.

     There is more friction between the ice and feer

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. A ball rolling along the ground gradually slows down and finally comes to rest is due to ________

  6. A.

     Friction

    B.

     Magnetic force

    C.

     Electrostatic force

    D.

     Muscular force

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Frictional force acts in

  8. A.

     The same direction as the motion

    B.

     The opposite direction of the motion

    C.

     All the directions

    D.

     Upward direction

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. The force which makes a vehicle to stop when break is applied is called

  10. A.

     Gravitational force

    B.

     Vanderwalls force

    C.

     Frictional force

    D.

     Covalant force

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. Vehicle tyres are inflated properly

  12. A.

     To ensure smooth running.

    B.

     To allow the vehicle to take more load.

    C.

     To avoid skidding and to minimise friction

    D.

     To go fast and save fuel.

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Friction is caused by the ________ on the two surfaces in contact.

  14. A.

     Irregularities

    B.

     Smoothness

    C.

     Densities

    D.

     Gaps

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. Ball bearings are used in cycles, scooters etc to

  16. A.

     Increase the friction between the wheel and the axle

    B.

     Reduce the friction between the wheel and the axle

    C.

     Reduce the friction between ground and the whee

    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. The force of friction between two surfaces will increase if:

  18. A.

     A layer of lubricant is kept between the two surfaces

    B.

     The two surfaces are pressed harder

    C.

     Air gap is created between the two surfaces

    D.

     Irregularities on both the surfaces are removed

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Rolling friction is caused by ________

  20. A.

     Non-elastic effects

    B.

     Gravity

    C.

     Power dissipation

    D.

     Buoyancy

    View Answer

    Workspace

    Discuss Discuss in Forum