Theory of Structures MCQ pdf - Set 03 - ObjectiveBooks

# Practice Test: Question Set - 03

1. The yield moment of a cross section is defined as the moment that will just produce the yield stress in
(A) The outer most fibre of the section
(B) The inner most fibre of the section
(C) The neutral fibre of the section
(D) The fibre everywhere

2. If Ix and Iy are the moments of inertia of a section about X and Y axes, the polar moment of inertia of the section, is
(A) (IX + IY)/2
(B) (IX - IY)/2
(C) IX + IY
(D) (IX/IY)

3. A simply supported beam carries varying load from zero at one end and w at the other end. If the length of the beam is a, the maximum bending moment will be
(A) wa/27
(B) wa2/27
(C) w2a/√27
(D) wa2/9√3

4. The forces acting on the bar as shown in the given figure introduce
(A) Compressive stress
(B) Tensile stress
(C) Shear stress
(D) None of these

5. If ENK and 1/m are modulus of elasticity, modulus of rigidity. Bulk modulus and Poisson ratio of the material, the following relationship holds good
(A) E = 3K (1 - 2/m)
(B) E = 2N (1 + 1/m)
(C) (3/2)K (1 - 2/m) = N (1 + 1/m)
(D) All the above

(A) Magnitude
(B) Direction
(C) Point of application
(D) All the above

7. The tangential component of stress on an plane inclined θ° to the direction of the force, may be obtained by multiplying the normal stress by
(A) sin θ
(B) cos θ
(C) tan θ
(D) sin2θ

8. A body is said to be in equilibrium if
(A) It moves horizontally
(B) It moves vertically
(C) It rotates about its C.G.
(D) None of these

9. Pick up the incorrect statement from the following: The torsional resistance of a shaft is directly proportional to
(A) Modulus of rigidity
(B) Angle of twist
(C) Reciprocal of the length of the shaft
(D) Moment of inertia of the shaft section

10. The forces acting normally on the cross section of a bar shown in the given figure introduce
(A) Compressive stress
(B) Tensile stress
(C) Shear stress
(D) None of these

11. A material is said to be perfectly elastic if
(A) It regains its original shape on removal of the load
(B) It regains its original shape partially on removal of the load
(C) It does not regain its original shape at all
(D) None of these

12. A shaft rotating N.R.M. under a torque T, transmits a power
(A) TπN/30 Newton meters/sec
(B) TπN/30 Newton meters/min
(C) TπN/60 Newton meters/min
(D) TπN/60 Newton meters/sec

13. If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:
(A) Q = S + F
(B) Q = S - F
(C) Q = F - S
(D) Q = S × F

14. The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity EI, is
(A) WL2/2EI
(B) WL2/3EI
(C) WL3/2EI
(D) WL3/3EI

15. Pick up the correct statement from the following:
(A) For a uniformly distributed load, the shear force varies linearly
(B) For a uniformly distributed load, B.M. curve is a parabola
(C) For a load varying linearly, the shear force curve is a parabola
(D) All the above

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