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Civil Engineering :: Applied Mechanics

  1. The moment of inertia of a triangular section (base b, height h) about centroidal axis parallel to the base, is

  2. A.

    \(\frac { b^3h } {1 2 } \)

    B.

    \(\frac { bh^3} {3 } \)

    C.

    \(\frac { bh^3} {3 6} \)

    D.

    \(\frac { bh^3} {2} \)

    E.

    \(\frac { bh^3} {8 } \)


  3. Periodic time of body moving with simple harmonic motion, is

  4. A.

    directly proportional to its angular velocity

    B.

    directly porportional to the square of its angular velocity

    C.

    inversly proportional to the square of its angular velocity

    D.

    inversely proportional to its angular velocity.


  5. On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts

  6. A.

    downwards at its upper end

    B.

    upwards at its upper end

    C.

    perpendicular to the wall at its upper end

    D.

    zero at its upper end

    E.

    none of these.


  7. The centre of gravity of a plane lamina will not be at its geometrical centre if it is a

  8. A.

    circle

    B.

    equilateral triangle

    C.

    rectangle

    D.

    square

    E.

    right angled triangle.


  9. The motion of a particle moving with S.H.M. from an extremity to the other, constitutes

  10. A.

    half an oscillation

    B.

    one full oscillation

    C.

    two oscillations

    D.

    none of these.


  11. Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by

  12. A.

    5.5 kg

    B.

    6.25 kg

    C.
    8.75 kg
    D.

    10.5 kg.


  13. The velocity of a moving body, is

  14. A.

    a vector quantity

    B.

    a scalar quantity

    C.

    a constant quantity

    D.

    none of these.


  15. If two equal forces of magnitude P act at an angle θ, their resultant, will be

  16. A.

    P cos θ/2

    B.

    2P sin θ/2

    C.

    P tan θ/2

    D.

    2P cos θ/2

    E.

    P sin θ/2.


  17. A body of weight 14 g appears to weight 13 g when weighed by a spring balance in a moving lift. The acceleration of the lift at that moment was

  18. A.

    0.5 m/sec2

    B.

    0.7 m/sec2

    C.

    1 m/sec2

    D.

    1 cm/sec2.


  19. The centre of gravity of a quadrant of a circle lies along its central radius at a distance of

  20. A.
    0.2 R
    B.

    0.3 R

    C.

    0.4 R

    D.

    0.5 R

    E.

    0.6 R.