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strength of materials mechanical engineering MCQs

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

strength of materials mechanical engineering Mcqs
1. Youngs modulus is defined as the ratio of ___________________?
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A. longitudinal stress and lateral strain

B. longitudinal stress and longitudinal strain

C. shear stress to shear strain

D. lateral stress and lateral strain

E. volumetric stress and volumetric strain

2. Which is the false statement about true stress-strain method______________?
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A. It does not exist

B. It is more sensitive to changes in both metallurgical and mechanical conditions

C. It gives, a more accurate picture of the ductility

D. It can be correlated with stress-strain values in other tests like torsion, impact, combined stress tests etc.

E. It can be used for compression tests as well.

3. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either___________________?
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A. all the above are correct

B. be all parallel

C. meet in a point

D. none of the above

E. at least two of them must meet

4. Diamond riveted joint can be adopted in the case of following type of joint _____________________?
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A. double riveted lap joints

B. butt joint

C. none of the above

D. lap joint

E. all types of joints

5. The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is_______________?
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A. one-fourth

B. four times

C. half

D. double

E. same

6. Which of the following has no unit __________________?
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A. bulk modulus

B. surface tension

C. strain

D. elasticity

E. kinematic viscosity

7. The stress induced in a body due to suddenly applied load compared to when it is applied gradually is________________?
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A. none of the above

B. two times

C. same

D. four times

E. half

8. The buckling load for a given material depends on___________________?
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A. Poissons ratio and modulus of elasticity

B. slenderness ratio, area of cross-section and modulus of elasticity

C. slenderness ratio and area of cross-section

D. Poissons ratio and slenderness ratio

E. slenderness ratio and modulus of elasticity

9. If a material expands freely due to heating it will develop ____________________?
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A. bending

B. no stress

C. thermal stresses

D. tensile stress

E. compressive stress

10. Deformation per unit length in the direction of force is known as_________________?
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A. lateral strain

B. linear stress

C. unit strain

D. strain

E. linear strain
11. In a tensile test, near the elastic limit zone, the______________?
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A. tensile strain increases in proportion to the stress

B. tensile strain decreases in proportion to the stress

C. tensile strain remains constant

D. tensile strain decreases more quickly

E. tensile strain increases more quickly
12. The maximum frictional force which comes into play when a body just begins to slide over another surface is called________________?
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A. dynamic friction

B. limiting friction

C. sliding friction

D. kinematic friction

E. rolling friction

13. In actual machines_____________________?
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A. mechanical advantage is equal to velocity ratio

B. mechanical advantage is unity

C. none of the above

D. mechanical advantage is less than velocity ratio

E. mechanical advantage is greater than velocity ratio

14. The property of a material by virtue of which a body returns to its original, shape after removal of the load is called____________________?
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A. malleability

B. resilience

C. ductility

D. plasticity

E. elasticity
15. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight________________?
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A. of same magnitude as that of bar and applied at the lower end

B. half the weight of bar applied at lower end

C. one-fourth of weight of bar applied at lower end

D. none of the above

E. half of the square of weight of bar applied at lower end

16. The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to___________________?
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A. modulus of rigidity

B. modulus of elasticity

C. Poissons ratio

D. Youngs modulus

E. bulk modulus
17. Rivets are made of following type of material_________________?
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A. hard

B. malleable

C. tough

D. resilient

E. ductile
18. The distance between the centres of the rivets in adjacent rows of zig-zag riveted joint is known as ____________________?
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A. back pitch

B. diagonal pitch

C. diametral pitch

D. pitch

E. lap

19. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is________________?
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A. half

B. one fourth

C. same

D. double

E. four times

20. In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the_________________?
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A. smaller of the two

B. size of rivet

C. average of size of rivet and hole

D. size of the drilled or reamed hole

E. any one of the above

21. Strain is defined as the ratio of__________________?
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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

41. Which of the following materials is most elastic_________________?
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A. rubber

B. glass

C. steel

D. brass

E. plastic

42. The change in the unit volume of a material under tension with increase in its Poissons ratio will ________________?
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A. remain same

B. unpredictable

C. increase

D. decrease

E. increase initially and then decrease

43. The intensity of stress which causes unit strain is called_______________?
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A. modulus of elasticity

B. principal stress

C. unit stress

D. modulus of rigidity

E. bulk modulus

44. The elasticity of various materials is controlled by its___________________?
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A. stress at yield point

B. stress at elastic limit

C. proof stress

D. tensile stress

E. ultimate tensile stress

45. When two plates are butt together and riveted with cover plates with two rows of rivets, the joi;it is known as ___________________?
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A. lap point

B. double riveted double cover butt joint

C. single riveted double cover butt joint

D. butt joint

E. single riveted single cover butt joint

46. Rupture stress is________________?
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A. maximum stress

B. maximum load/original cross-sectional area

C. load at breaking point/neck area

D. load at breaking point/A

E. breaking stress

47. A non-yielding support implies that the_________________?
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A. support is frictionless

B. support holds member firmly

C. slope of the beam at the support is zero

D. none of the above

E. support can take any amount of reaction

48. The property of a material by virtue of which it can be beaten or rolled into plates is called _________________?
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A. ductility

B. malleability

C. elasticity

D. plasticity

E. reliability

49. Shear stress induced in a shaft subjected to tension will be__________________?
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A. uniform throughout

B. maximum at periphery and zero at center

C. none of the above

D. average value in center

E. maximum at center

50. Proof resilience per material is known as________________?
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A. toughness

B. modulus of resilience

C. impact energy

D. proof resilience

E. resilience