Strength of Materials Multiple Choice Questions with Answers - Set 05 - ObjectiveBooks
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# Practice Test: Question Set - 05

1. A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
(A) T watts
(B) 2π. T.ω watts
(C) 2π. T.ω/75 watts
(D) 2π. T.ω/4500 watts

2. The buckling load for a given material depends on
(A) Slenderness ratio and area of cross-section
(B) Poisson's ratio and modulus of elasticity
(C) Slenderness ratio and modulus of elasticity
(D) Slenderness ratio, area of cross-section and modulus of elasticity

3. When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
(A) Equal to
(B) Directly proportional to
(C) Inversely proportional to
(D) Independent of

4. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called
(A) Creeping
(B) Yielding
(C) Breaking
(D) Plasticity

5. The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σx and σy) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by
(A) OC
(B) OP
(C) OQ
(D) PQ

6. A double strap butt joint with equal straps is
(A) Always in single shear
(B) Always in double shear
(C) Either in single shear or double shear
(D) None of these

7. The stress induced in a body due to suddenly applied load compared to when it is applied gradually is
(A) Same
(B) Half
(C) Two times
(D) Four times

8. The rivets are used for _________ fastenings.
(A) Permanent
(B) Temporary
(C) Semi-permanent
(D) None of these

9. When two plates are butt together and riveted with cover plates with two rows of rivets, the joint is known as
(A) Lap joint
(B) Butt joint
(C) Single riveted single cover butt joint
(D) Double riveted double cover butt joint

10. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
(A) Tensile
(B) Compressive
(C) Shear
(D) Zero

11. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m, and then the hoop stress will be
(A) 30 MN/m²
(B) 50 MN/m²
(C) 100 MN/m²
(D) 200 MN/m²

12. When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)
(A) 2ε₁ - ε₂
(B) 2ε₁ + ε₂
(C) 2ε₂ - ε₁
(D) 2ε₂ + ε₁

13. Shear stress induced in a shaft subjected to tension will be
(A) Maximum at periphery and zero at center
(B) Maximum at center
(C) Uniform throughout
(D) None of the above

14. The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is
(A) L = l/2
(B) L = l/√2
(C) L = l
(D) L = 2l

15. Strain is defined as the ratio of
(A) Change in volume to original volume
(B) Change in length to original length
(C) Change in cross-sectional area to original cross-sectional area
(D) Any one of the above

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