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Engineering Mechanics - Section 7

  1. Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

    2. A.

    \(\frac { BD^3 } { 12 } - \frac { bd^3 } { 12 }\)
    B.

    \(\frac { DB^3 } { 12 } - \frac { db^3 } { 12 }\)
    C.

    \(\frac { BD^3 } { 36 } - \frac { bd^3 } { 36 }\)
    D.

    \(\frac { DB^3 } { 36 } - \frac { db^3 } { 36 }\)

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  2. Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces.

    3. A.

    Correct
    B.

    Incorrect

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  3. All the steel trusses of the bridges, have one of their end roller supported, and other end hinged. The main advantage of such a support is that the truss remains stable.

    4. A.

    True
    B.

    False

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  4. The time of flight of a projectile on downward inclined plane depends upon

    5. A.

    angle of projection
    B.

    angle of inclination of the plane
    C.

    both (a) and (b)
    D.

    none of these

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  5. The force induced in the string BC due to the load W as shown in the below figure is

    6. A.

    W sin θ
    B.

    W cos θ
    C.

    W tan θ
    D.

    W cot θ

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