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  1. The center of gravity of a uniform lamina lies at

  2. A.

     the center of heavy portion

    B.

     the bottom surface

    C.

     the mid point of its axis

    D.

     all of the above


  3. The center of gravity of a triangle lies at the point of

  4. A.

     Concurrence of the medians

    B.

     Intersection of its altitudes

    C.

     Intersection of bisector of angles

    D.

     Intersection of diagonals


  5. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

  6. A.

     25

    B.

     50

    C.

     100

    D.

     250


  7. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of

  8. A.

     r/2

    B.

     r/A

    C.

     r/%

    D.

     0.134 r


  9. The center of percussion of the homogeneous rod of length L suspended at the top will be

  10. A.

     L/2

    B.

     L/3

    C.

     3L/4

    D.

     2L/3


  11. The necessary condition for forces to be in equilibrium is that these should be

  12. A.

     Coplanar

    B.

     Meet at one point

    C.

     Both (A) and (B) above

    D.

     All be equal


  13. The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

  14. A.

     r/2

    B.

     2r/3

    C.

     r/A

    D.

     3r/2


  15. Dynamic friction as compared to static friction is

  16. A.

     same

    B.

     more

    C.

     less

    D.

     may be less of more depending on nature of surfaces and velocity


  17. Which of the following do not have identical dimensions?

  18. A.

     Momentum and impulse

    B.

     Torque and energy

    C.

     Torque and work

    D.

     Moment of a force and angular momentum


  19. The co-efficient of friction depends upon

  20. A.

     nature of surfaces

    B.

     area of contact

    C.

     shape of the surfaces

    D.

     ail of the above.