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Mechanical Engineering :: Engineering Mechanics

  1. The moment of inertia of a thin rod of mass m and length l,about an axis through its centre of gravity and perpendicular to its length is

  2. A.

    ml2/4

    B.

    ml2/ 6

    C.

    ml2/8

    D.

    ml2/12


  3. When a body of mass m attains a velocity v from rest in time t, then the kinetic energy of translation is

  4. A.

    mv2

    B.

    mgv2

    C.

    0.5 mv2

    D.

    0.5 mgv2


  5. The unit of angular velocity is

  6. A.

    m/min

    B.

    rad/s

    C.

    revolutions/min

    D.

    both (B) and (C)

    E.

    none of these


  7. If a number of forces are acting at a point, their resultant is given by

  8. A.

    (∑V)2 + (∑H)2

    B.

    \(\sqrt{(\sum V)^2 + (\sum H)^2}\)

    C.

    (∑V)2 +(∑H)2 +2(∑V)(∑H)

    D.

    \(\sqrt{(∑V)2 +(∑H)2 +2(∑V)(∑H)}\)


  9. A force acting in the opposite direction to the motion of the body is called force of friction.

  10. A.

    Agree

    B.

    Disagree