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Civil Engineering :: Applied Mechanics

  1. A particle moving with a simple harmonic motion, attains its maximum velocity when it passes

  2. A.

    the extreme point of the oscillation

    B.

    through the mean position

    C.

    through the mean position

    D.

    none of these.


  3. The moment of intertia of a circular lamina of diameter d, about an axis perpendicular to the plane of the lamina and passing through its centre, is

  4. A.

    \(\frac { nd^4 } {1 2 } \)

    B.

    \(\frac { nd^4 } {16 } \)

    C.

    \(\frac { nd^4 } {24 } \)

    D.

    \(\frac { nd^4 } {32 } \)

    E.

    \(\frac { nd^4 } {36 } \)


  5. The unit of impulse, is

  6. A.

    kg.m/sec

    B.

    kg.m/sec3

    C.

    kg.m/sec2

    D.

    kg.m2/sec.


  7. If l is the span of a light suspension bridge whose each cable carries total weight (w) and the central dip is y, the horizontal pull at each support, is

  8. A.

    \( \frac { Wl } { 4Y } \)

    B.

    \( \frac { Wl } { 8Y } \)

    C.

    \( \frac { Wl } { 2Y } \)

    D.

    wl.


  9. The practical units of work, is

  10. A.

    erg

    B.

    joule

    C.

    Newton

    D.

    dyne.


  11. The rate of change of displacement of a body with respect to its surrounding, is known

  12. A.

    velocity

    B.

    acceleration

    C.

    speed

    D.

    none of these.


  13. The C.G. of a hemisphere from its base measured along the vertical radius is at a distance of

  14. A.

    \(\frac { 4R } { 3n } \)

    B.

    \(\frac { 3R } { 8 } \)

    C.

    \(\frac { 3nR } { 4 } \)

    D.

    \(\frac { 8R } { 3 } \)

    E.

    R/2.


  15. The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is

  16. A.

    7.5 cm

    B.

    5.0 cm

    C.

    8.75 cm

    D.

    7.85 cm

    E.

    none of above.


  17. For a self-locking machine, the efficiency should be

  18. A.

    less than 60%

    B.
    50%
    C.

    more than 50%

    D.

    None of these.


  19. When a body moves round a fixed axis, it has

  20. A.

    a rotary motion

    B.

    a circular motion

    C.

    a translatory

    D.

    a rotary motion and translatory motion.