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Civil Engineering :: Applied Mechanics and Graphic Statics

  1. The angle which an inclined surface makes with the horizontal when a body placed on it is on the point of moving down, is called

  2. A.

     Angle of repose

    B.

     Angle of friction

    C.

     Angle of inclination

    D.

     None of these


  3. The resultant of two forces acting at right angles is √34 kg and acting at 60° is 70 kg. The forces are

  4. A.

     1 kg and 4 kg

    B.

     2 kg and 3 kg

    C.

     √3 kg and √5 kg

    D.

     3 kg and 5 kg


  5. The moment of inertia of a circular lamina of diameter ‘d’, about an axis perpendicular to the plane of the lamina and passing through its centre, is

  6. A.

     π/64 (D⁴ + d⁴)

    B.

     πd⁴/16

    C.

     πd⁴/24

    D.

     πd⁴/32


  7. A circular disc rotates at n rpm. The angular velocity of a circular ring of same mass and radius as the disc and to have the same angular momentum is

  8. A.

     n rpm

    B.

     n/2 rpm

    C.

     n/4 rpm

    D.

     2n rpm


  9. Instantaneous center is at infinity when the angular velocity is

  10. A.

     Constant

    B.

     Zero

    C.

     Maximum

    D.

     Minimum


  11. A disc of mass 4 kg, radius 0.5 m and moment of inertia 3 kg.m² rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is

  12. A.

     50 J

    B.

     150 J

    C.

     200 J

    D.

     400 J


  13. A cable loaded with 0.5 tonne per horizontal metre span is stretched between supports in the same horizontal line 400 m apart. If central dip is 20 m, the minimum tension in the cable, will be

  14. A.

     200 tonnes at the centre

    B.

     500 tonnes at the centre

    C.

     200 tonnes at the right support

    D.

     200 tonnes at the left support


  15. A simple pendulum of length 1 has an energy E when its amplitude is A. If its amplitude is increased to 2A, the energy becomes

  16. A.

     E

    B.

     E/2

    C.

     2E

    D.

     4E


  17. A simple pendulum of length / has an energy E, when its amplitude is A. If the length of pendulum is doubled, the energy will be

  18. A.

     E

    B.

     E/2

    C.

     2E

    D.

     4E


  19. If the horizontal range is 2.5 times the greatest height, the angle of projection of the projectile, is

  20. A.

     57°

    B.

     58°

    C.

     59°

    D.

     60°