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Civil Engineering :: Theory of Structures

  1. The assumption in the theory of bending of beams, is :

  2. A.

    material is homogeneous

    B.
    material is isotropic
    C.
    Young's modulus is same in tension as well as in compression
    D.
    each layer is independent to expand or to contract
    E.
    all the above.

  3. In case of principal axes of a section

  4. A.

    sum of moment of inertia is zero

    B.

    difference of moment inertia is zero

    C.

    product of moment of inertia is zero

    D.
    none of these.

  5. The shape factor of standard rolled beam section varies from

  6. A.

    1.10 to 1.20

    B.

    1.10 to 1.20

    C.

    1.30 to 1.40

    D.
    1.40 to 1.50

  7. Shear strain energy theory for the failure of a material at elastic limit, is due to

  8. A.

    Rankine

    B.

    Guest or Trecas

    C.

    St. Venant

    D.
    Haig
    E.

    Von Mises.


  9. The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity EI, is

  10. A.

    \(\frac { WL^2 } { 2 EI} \)

    B.

    \(\frac { WL^2 } { 3 EI} \)

    C.

    \(\frac { WL^3} { 2 EI} \)

    D.

    \(\frac { WL^3} { 3 EI} \)


  11. The point of contraflexure is the point where

  12. A.

    B.M. changes sign

    B.

    B.M. is maximum

    C.

    B.M. is minimum

    D.

    S.F. is zero.


  13. The normal component of a force inclined through θ° is obtained by multiplying the force by

  14. A.

    sin θ

    B.

    cos θ

    C.
    tan θ
    D.

    sin θ cos θ

    E.

    sin2θ


  15. A material which obeys Hook's law, is subjected to direct stress σ0. At its elastic limit, the following statement is true,

  16. A.

    Strain is equal  to =  \( \frac { σ0. } { E} \) 

    B.

    Maximum shear stress =\( \frac { σ0. } { 2} \)

    C.
    Strain energy =\( \frac { σ0.^2 } { 2E} \) x volume
    D.

    Shear strain energy =\( \frac { σ0. } { 6N} \) x volume

    E.

    All the above.


  17. In the truss shown in the given figure, the force in member BC is

  18. A.

    100 t compressive

    B.

    100 t tensile

    C.

    zero

    D.

    indeterminate


  19. In case of principal axes of a section

  20. A.

    sum of moment of inertia is zero

    B.

    sum of moment of inertia is zero

    C.

    product of moment of inertia is zero

    D.
    none of these.