strength-of-materials mechanical-engineering question and answers -Page 14

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Strength of Materials problems

1. Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be
Options
A. 2:5
B. 5:2
C. 4:3
D. 3:4

3. The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (?_x and ?_y) acting at a body across two mutually perpendicular planes. The resultant stress is given by
Options
A. OC
B. OP
C. OQ
D. PQ

4. When a body is subjected to bi-axial stress i.e. direct stresses (?_x) and (?_y) in two mutually perpendicular planes accompanied by a simple shear stress (?_xy), then maximum shear stress is
Options
A.
B.
C.
D.

5. In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least __________ the total water pressure per metre length.
Options
A. equal to
B. 1.5 times
C. double
D. 2.5 times

7. When a bar of length l and diameter d is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
Options
A.
B.
C.
D.

8. A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the
Options
A. top of the section
B. bottom of the section
C. neutral axis of the section
D. junction of web and flange

10. When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
Options
A. equal to
B. directly proportional to
C. inversely proportional to
D. independent of

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