Strength of Material (SOM) Questions and Answers Practice Test - Set 21 - ObjectiveBooks

# Practice Test: Question Set - 21

1. The ductility of the material __________ with the decrease in percentage elongation of a specimen under tensile test.
(A) Increases
(B) Decreases
(C) Remain same
(D) None of these

2. The length of a conical bar is l, diameter of base is d and weight per unit volume is w. It is fixes at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be
(A) wl²/2E
(B) wl²/4E
(C) wl²/6E
(D) wl²/8E

3. The ratio of linear stress to the linear strain is called
(A) Modulus of rigidity
(B) Modulus of elasticity
(C) Bulk modulus
(D) Poisson's ratio

4. For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to __________ of the main circle.
(A) One-half
(B) One-third
(C) One-fourth
(D) One-eighth

5. The shear modulus of most materials with respect to the modulus of elasticity is
(A) Equal to half
(B) Less than half
(C) More than half
(D) None of these

6. Whenever a material is loaded within elastic limit, stress is __________ strain.
(A) Equal to
(B) Directly proportional to
(C) Inversely proportional to
(D) None of these

7. In the below figure, Hook's law holds good, for the portion from_________.

(A) O to A
(B) B to D
(C) D to E
(D) None of these

8. The point of contraflexure occurs in
(A) Cantilever beams
(B) Simply supported beams
(C) Overhanging beams
(D) Fixed beams

9. The bending moment of a cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is ________ at the fixed end.
(A) wl/2
(B) wl
(C) wl²/2
(D) wl²/6

10. The maximum deflection of a cantilever beam of length ‘l’ with a uniformly distributed load of ‘w’ per unit length is (where W = wl)
(A) Wl³/3EI
(B) Wl³/8EI
(C) Wl³/16EI
(D) Wl³/48EI

11. When a bar of length l, width b and thickness t is subjected to a pull of P, its
(A) Length, width and thickness increases
(B) Length, width and thickness decreases
(C) Length increases, width and thickness decreases
(D) Length decreases, width and thickness increases

12. A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the
(A) Top of the section
(B) Bottom of the section
(C) Neutral axis of the section
(D) Junction of web and flange

13. The maximum deflection of a fixed beam of length l carrying a central point load W is
(A) wl³/48 EI
(B) wl³/96 EI
(C) wl³/192 EI
(D) wl³/384 EI

14. The torque transmitted by a hollow shaft of outer diameter (D) and inner diameter (d) is
(A) (Ï€/4) × Ï„ [(D² - d²)/d]
(B) (Ï€/16) × Ï„ [(D³ - d³)/d]
(C) (Ï€/16) × Ï„ [(D⁴ - d⁴)/d]
(D) (Ï€/32) × Ï„ [(D⁴ - d⁴)/d]

15. At the neutral axis of a beam
(A) The layers are subjected to maximum bending stress
(B) The layers are subjected to minimum bending stress
(C) The layers are subjected to compression
(D) The layers do not undergo any strain

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