Free Online Mechanical Strength of Materials Practice Test - Set 19 - ObjectiveBooks

# Practice Test: Question Set - 19

1. According to Euler's column theory, the crippling load for a column length (l) hinged at both ends, is
(A) π²EI/l²
(B) π²EI/4
(C) 4π²EI/l²
(D) 2π²EI/l²

2. A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to hoop strain is
(A) (m - 2)/(2m - 1)
(B) (2m - 1)/(m - 2)
(C) (m - 2)/(2m + 1)
(D) (2m + 1)/(m - 2)

3. Young's modulus may be defined as the ratio of
(A) Linear stress to lateral strain
(B) Lateral strain to linear strain
(C) Linear stress to linear strain
(D) Shear stress to shear strain

4. The maximum bending moment for the beam shown in the below figure, lies at a distance of ________ from the end B.

(A) l/2
(B) l/3
(C) l/√2
(D) l/√3

5. Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.
(A) One-sixteenth
(B) One-eighth
(C) One-fourth
(D) One-half

6. The bending moment on a section is maximum where shear force is
(A) Minimum
(B) Maximum
(C) Changing sign
(D) Zero

7. The stress developed in the material without any permanent set is called
(A) Elastic limit
(B) Yield stress
(C) Ultimate stress
(D) Breaking stress

8. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the diameter of wire of spring 'A' is double that of spring 'B' The stiffness of spring 'B' will be __________ that of spring 'A'
(A) One-sixteenth
(B) One-eighth
(C) One-fourth
(D) One-half

9. In a riveted joint, when the number of rivets decreases from the inner most row to outer most row, the joint is said to be
(A) Chain riveted
(B) Zig-zag riveted
(C) Diamond riveted
(D) None of these

10. The polar modulus for a hollow shaft of outer diameter (D) and inner diameter (d) is
(A) (π/4) × (D² - d²)/D
(B) (π/16) × (D3 - d3)/D
(C) (π/16) × (D⁴ - d⁴)/D
(D) (π/32) × (D⁴ - d⁴)/D

11. A leaf spring is supported at the
(A) Ends and loaded at the center
(B) Center and loaded at the ends

12. The assumption made in the theory of the reinforced cement concrete beam is that
(A) All the tensile stresses are taken up by the steel reinforcement only
(B) There is a sufficient bond between steel and concrete
(C) The steel and concrete are stressed within its elastic limit
(D) All of the above

13. The ultimate tensile stress for mild steel is __________ the ultimate compressive stress.
(A) Equal to
(B) Less than
(C) More than
(D) None of these

14. The neutral axis of the cross-section of a beam is that axis at which the bending stress is
(A) Zero
(B) Minimum
(C) Maximum
(D) Infinity

15. When a thin cylindrical shell is subjected to an internal pressure, there will be
(A) A decrease in diameter and length of the shell
(B) An increase in diameter and decrease in length of the shell
(C) A decrease in diameter and increase in length of the shell
(D) An increase in diameter and length of the shell

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