Mechanics Of Materials & Structures Online Test

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Vikash chaudhary

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Total Questions: 50
Time Allotted: 50 minutes
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1 / 50

1. The actual breaking stress of a ductile material from a tension test will be

a) greater than the ultimate strength

b) equal to the ultimate strength

c) equal to the nominal breaking stress

d) less than the ultimate strength but greater than the nominal breaking stress

2 / 50

2. The phenomenon of slow growth of strain under steady tensile stress, i.e., increasing with time, is called

a) yielding

b) creeping

c) breaking

d) none of the above

3 / 50

3. In simple bending theory, the assumption that a plane section before bending remains plane after bending implies that

a) stress is proportional to strain at all sections

b) strain is proportional to the distance from the neutral axis

c) stress is uniform in the cross-section

d) none of the above

4 / 50

4. A long vertical member subjected to an axial compressive load is called

a) column

b) strut

c) tie

d) tanchion

5 / 50

5. An orthotropic material has

a) inelastic properties

b) non-homogeneous properties

c) the same properties in an orthogonal direction

d) different properties in three perpendicular directions

6 / 50

6. The section modulus of a rectangular section is proportional to

a) area of the section

b) square of the area of the section

c) product of the area & depth

d) half moment of inertia of the section

7 / 50

7. *Young's modulus is the ratio of

a) Volumetric stress/volumetric strain

b) Lateral stress/lateral strain

c) Longitudinal stress/ longitudinal strain

d) Shear stress/ shear strain

8 / 50

8. The crippling load for a column with both ends hinged is

a) πΕΙ/ L^2

b) π^2EI/4L^2

c) π^2EI/L^2

d) 4π^2EI/L^2

9 / 50

9. *A point where SF is zero, BM is

a) maximum

b) minimum

c) either maximum or minimum

d) none of the above

10 / 50

10. Which of the following end conditions permits the displacement in any direction and also rotation

a) fixed end

b) hinge end

c) free end

d) roller end

11 / 50

11. In an I section, almost all the shear force is taken by

a) top flange

b) web

c) bottom flange

d) none of the above

12 / 50

12. The effective length of a column effectively held in position and restrained in direction at one end will be

a) 1l

b) 1.5 l

c) 2 l

d) 3 l

13 / 50

13. The moment of inertia of a square section is given by

a) I = b^4/12

b) I = b^3/12

c) I = b^4

d) I = b^4/3

14 / 50

14. The safe value of stress below which the material will not fail when subjected to a reversal of stress is known as

a) endurance limit

b) fatigue stress

c) tolerance limit

d) elastic limit

15 / 50

15. Bending moment diagram of simply supported beam with a point load at the centre of the span is

a) parabola

b) triangular

c) rectangle

d) diagonal

16 / 50

16. *Find the maximum bending moment in a simply supported beam loaded with a UDL of 2 t/m having a span of 4m

a) 2 t-m

b) 4 t-m

c) 6 t-m

d) 8 t-m

17 / 50

17. How does Young's Modulus vary with an increase in temperature?

a) will increase

b) will not be affected

c) will decrease

d) impossible to predict

18 / 50

18. If the Poisson's ratio of a material is 0.25, the ratio of Modulus of Rigidity to the Young's Modulus is

a) 2

b) 0.4

c) 2.5

d) 4

19 / 50

19. A column that fails primarily due to buckling is known as

a) long column

b) short column

c) wear column

d) medium column.

20 / 50

20. *If the shear force along a section of a beam is zero, the bending moment at the section is:

a) zero

b) maximum

c) minimum

d) average of maximum-minimum

21 / 50

21. If α is the coefficient of linear expansion, T is the rise in temperature, then thermal stress is given by

a) ETα

b) ET/α

c) Eα/T

d) Tα/E

22 / 50

22. The ratio of the effective length of a column and the minimum radius of gyration of its cross-sectional area is known as

a) buckling factor

b) slenderness ratio

c) crippling factor

d) none of the above

23 / 50

23. *The ratio of the intensity of stress in a case of a suddenly loaded to that of gradually applied load is

a) same

b) half

c) twice

d) thrice

24 / 50

24. The maximum bending moment caused by a large number of equally spaced identical loads on a simply supported beam is (W = wL)

a) WL/6

b) WL/8

c) WL/16

d) WL/2y

25 / 50

25. *Fatigue is the failure of a material under:

a) constant loads but occasionally well above static load

b) varying loads, well below ultimate static load

c) constant loads well below ultimate static load

d) varying loads well above ultimate static load

26 / 50

26. *Proof resilience is the greatest stored energy at

a) limit of proportionality

b) elastic limit

c) plastic limit

d) yield point

27 / 50

27. If all the dimensions of a bar are increased in the proportion n:1, the proportion with which the maximum stress produced in the prismatic bar by its own weight will increase in the ratio

a) 1:n

b) n:1

c) 1:1/n

d) 1/n:1

28 / 50

28. A viscoelastic material

a) is an elastic material

b) has a small plastic zone

c) has a time-dependent stress-strain relation

d) has a viscous surface

29 / 50

29. Along the neutral axis of a simply supported beam

a) fibers do not undergo strain

b) fibers undergo very little strain

c) the fibers are subjected to maximum stress

d) none of the above

30 / 50

30. The rate of change of shear force is called

a) BM

b) point load

c) intensity of load

d) slope

31 / 50

31. The difference in ordinate of the shear force between any two sections is equal to the area under

a) shear curve between these two sections

b) load curve between these two sections

c) bending moment curve between these two sections

d) load curve between these two sections plus concentrated load applied between the sections

32 / 50

32. The number of reaction components at a hinge on rollers support is

a) 1

b) 2

c) 4

33 / 50

33. The region of c/s of a column in which compressive load may be applied without producing tensile load is known as

a) core

b) more

c) compression area

d) tension area

34 / 50

34. The property of material by which it can be beaten or rolled into plates is called

a) malleability

b) ductility

c) plasticity

d) elasticity

35 / 50

35. *Normal strain is defined as

a) rate of change of length

b) strain that normally occurs

c) strain that is normal to shear strain

d) deformation normal to the force

36 / 50

36. Find the maximum BM induced in a cantilever beam subjected to a point load of 10 KN and a length of the beam is 10 m. The load is located at a distance of 3 m from the free end:-

a) 40 kN-m

b) 50 kN-m

c) 60 kN-m

d) 70 kN-m

37 / 50

37. A beam of uniform strength will have at every cross-section the same

a) deflection

b) stiffness

c) BM

d) bending stress

38 / 50

38. What is tenacity?

a) ultimate strength in tension

b) ultimate strength in compression

c) ultimate shear strength

d) ultimate impact strength

39 / 50

39. The beam strongest in flexure will have the maximum

a) moment of inertia

b) section modulus

c) area of cross-section

d) none of the above

40 / 50

40. An isotropic material has

a) elastic mass

b) homogeneous mass

c) elastoplastic mass

d) none of the above

41 / 50

41. If the elasticity of the material is zero then the material is said to be

a) rigid

b) perfect

c) plastic

d) all of the above

42 / 50

42. Strain energy of a member may be defined as work done on it

a) to deform it

b) to resist elongation

c) to resist shortening

d) all of the above

43 / 50

43. Longitudinal cracks observed in timber beams are due to

a) high bending stresses

b) application of concentrated loads over the beam

c) shear failure between the layers

d) timber not being in compression

44 / 50

44. The maximum deflection of a simply supported beam subjected to a uniformly distributed load (w) over the span is

a) WL^3 / 8EI

b) WL^3 / 48EI

c) 5WL^3 / 48EI

d) 5WL^3 / 384EI

45 / 50

45. Find the elongation of a bar if c/s area of the bar is A, length 1, applied load p, modulus of elasticity of material is E

a) PI/AE

b) AE/PI

c) PA/IE

d) PE/AI

46 / 50

46. *Which of the following is dimensionless?

a) bulk modulus

b) strain

c) shear stress

d) none of the above

47 / 50

47. The maximum deflection in a cantilever beam carrying a concentrated load 'w' at the free end is (Where L is span of bean, W is total load and EI is flexural rigidity)

a) WL^3 / 8EI

b) WL^2 / 5EI

c) WL^3 / 3EI

d) 3WL^3 / 2EI

48 / 50

48. A body having similar properties throughout

a) homogeneous

b) isomorphic

c) isotropic

d) anisotropy

49 / 50

49. The effective length of a column if both ends are hinged

a) L

b) 0.5L

c) 2L

d) 4L

50 / 50

50. *The Young's Modulus of elasticity is defined as the ratio of stress & strain within the

a) plastic limit

b) all of the above

c) yield limit

d) elastic limit

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