strength of materials mechanical engineering MCQs – Page 2

Practise focused strength of materials mechanical engineering questions with marked answers for exam preparation and subject revision.

strength of materials mechanical engineering Mcqs

21. Strain is defined as the ratio of__________________?
0

A. change in volume to original volume

B. change in cross-sectional area to original cross-sectional area

C. none of the above

D. any one of the above

E. change in length to original length

22. If the rivets in adjacent rows are staggered and the outermost row has only one rivet, the arrangement of the rivets is called__________________?
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A. criss-cross riveting

B. none of the above

C. chain riveting

D. zig zag riveting

E. diamond riveting

23. The maximum strain energy that can be stored in a body is known as________________?
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A. proof resilience

B. resilience

C. impact energy

D. toughness

E. modulus of resilience

24. The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________?
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A. ultimate point of the material

B. yielding point of the material

C. plastic point of the material

D. elastic point of the material

E. breaking point of the material

25. Poissons ratio is defined as the ratio of_________________?
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A. longitudinal stress and longitudinal strain

B. longitudinal stress and lateral stress

C. lateral stress and longitudinal stress

D. lateral stress and lateral strain

E. none of the above

26. The weakest section of a diamond riveting is the section which passes through ___________________?
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A. none of the above

B. the first row

C. the second row

D. one rivet hole of the end row

E. the central row

27. The C.G. of a right circular solid cone of height h lies at the following distance from the base________________?
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A. J/3

B. h/4

C. h/6

D. h/2

E. 3/i/5

28. Longitudinal stress in a thin cylinder is__________________?
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A. half of the hoop stress

B. twice the hoop stress

C. equal to the hoop stress

D. one-fourth of hoop stress

E. four times the hoop stress

29. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be_________________?
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A. 200 MN/m2

B. 50 MN/m2

C. 100 MN/m2

D. 30 MN/m2

E. 300 MN/m2

30. The torsional rigidity of a shaft is expressed by the_______________?
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A. elastic limit up to which it resists torsion, shear and bending stresses

B. number of cycles it undergoes before failure

C. maximum power it can transmit at highest possible-speed

D. maximum torque it can transmit

E. torque required to produce a twist of one radian per unit length of shaft

31. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is____________________?
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A. twice

B. half

C. four times

D. same

E. eight times

32. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is__________________?
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A. 90.

B. 45

C. 60

D. 30

E. 0

33. The value of modulus of elasticity for mild steel is of the order of________________?
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A. 2.1 x 107 kg/cm2

B. 2.1 X 106 kg/cm2

C. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2

D. 2.1xl05 kg/cm2

34. A riveted joint in which the number otrivets decrease from innermost to outer most row is called__________________?
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A. none of the above

B. criss-cross riveted joint

C. zig-zag riveted joint

D. chain riveted joint

E. diamond riveted joint

35. In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are ?
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A. average of the sum of moduli of elas-ticity

B. proportional to their respective moduli of elasticity

C. none of the above

D. equal

E. inversely proportional to their moduli of elasticity

36. The necessary condition for forces to be in equilibrium is that these should be_____________________?
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A. coplanar

B. meet at one point ;

C. both A. and B. above

D. all be equal

E. something else

37. Resilience of a material is considered when it is subjected to_________________?
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A. shock loading

B. frequent heat treatment

C. resonant condition

D. creep

E. fatigue

38. Dynamic friction as compared to static friction is __________________?
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A. has no correlation

B. less

C. may be less of more depending on nature of surfaces and velocity

D. same

E. more

39. The materials having same elastic properties in all directions are called________________?
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A. ideal materials

B. isotropic materials

C. elastic materials

D. uniform materials

E. paractical materials

40. The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be _________________?
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A. 1:04

B. 01:02.2

C. 01:02.5

D. 1 : 3

E. 1:02

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