Mechanics Of Materials & Structures Online Test

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Vikash chaudhary

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Total Questions: 50
Time Allotted: 50 minutes
Passing Score: 70%
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1 / 50

1. 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

2 / 50

2. The stress due to temperature change in a member depends on

a) cross-section of the member

b) length of the member

c) supporting end conditions

d) none of the above

3 / 50

3. 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

4 / 50

4. If magnitude and direction of a load does not change with respect to time, this type of load is called

a) point load

b) static load

c) dynamic load

d) wind load

5 / 50

5. Moment of inertia of a rectangular beam bxd is

a) bd^3/12

b) bd^3/6

c) db^3/12

d) db^3/6

6 / 50

6. The stress necessary to initiate yielding is considerably

a) more than necessary to continue it

b) less than necessary to continue it

c) more than necessary to stop it

d) less than necessary to stop it

7 / 50

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

a) 1

b) 2

c) 4

8 / 50

8. *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

9 / 50

9. 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

10 / 50

10. A beam simply supported at ends is subjected to load. The maximum bending moment is located where

a) shear force is zero

b) shear force is maximum

c) bending moment is zero

d) axial thrust is zero

11 / 50

11. The section modulus of a circular section about an axis through its C.G. is

a) πd^2/16

b) πd^3/32

c) πd^3/64

d) πd^2/64

12 / 50

12. If y is the deflection of the beam, then shear force is

a) y

b) dy/dx

c) d²y/dx²

d) d^3y/dx²

13 / 50

13. The stress in the member subjected to a force is

a) continued deformation under sustained loading

b) load per unit area

c) the resistance offered by the material per unit area to a force

d) the strain per unit length

14 / 50

14. *The maximum bending moment in a simply supported beam UDL is applied

a) ends

b) mid

c) 1/2 distance

d) none of the above

15 / 50

15. Which one is correct if the deflection of a beam is y

a) θ = dy/dx

b) dθ/dx = d²y/dx²

c) M = EI/R

d) all of the above

16 / 50

16. *Strut is a

a) horizontal member

b) vertical member

c) inclined member

d) compression member

17 / 50

17. *Maximum bending moment occurs where

a) shear force is maximum

b) shear force is less than one

c) shear force changes sign

d) deflection is zero

18 / 50

18. *The phenomenon of decreased resistance of material due to the reversal of stress is called

a) creep

b) fatigue

c) elasticity

d) plasticity

19 / 50

19. *Stress may be defined as force

a) volume

b) length

c) area

d) none of the above

20 / 50

20. *"A simply supported beam of span L carries a uniformly distributed load W. The maximum bending moment, M is:

a) WL/2

b) WL/4

c) WL/8

d) WL/16

21 / 50

21. Buckling load for a given column depends upon

a) length of the column only

b) least lateral dimension only

c) both length and least lateral dimension

d) none of the above

22 / 50

22. The point of contraflexure occurs in a beam

a) cantilevers only

b) simply supported only

c) overhanging only

d) all of the above

23 / 50

23. 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

24 / 50

24. *The compression test is commonly used for testing

a) ductile materials

b) rubber

c) brittle materials

d) none of the above

25 / 50

25. A brittle material has

a) no plastic zone

b) no inelastic zone

c) a very little plastic zone

d) a large plastic zone

26 / 50

26. 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

27 / 50

27. The maximum bending moment caused by a moving load on a fixed-end beam occurs

a) at the support

b) under the load

c) at mid span

d) none of the above

28 / 50

28. Point of contraflexure is a point where bending moment

a) minimum

b) maximum

c) zero

d) changes sign

29 / 50

29. The variation of the bending moment in the portion of the beam carrying a linearly varying load is

a) linear

b) parabolic

c) cubic

d) deflection is zero

30 / 50

30. *Stress in a beam due to simple bending is

a) inversely proportional

b) directly proportional

c) curvilinear related

d) all of the above

31 / 50

31. *If a cantilever beam of 8m long has a uniformly distributed load of 2KN/m throughout the length and a 10KN point load at the center of the beam, find the moment at the center:

a) 8 KN-m

b) 16 KN-m

c) 32 KN-m

d) 44 KN-m

32 / 50

32. 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

33 / 50

33. Euler's formula for a column of length 1, with one end fixed and other hinged is

a) P= 2π^2EI/l^2

b) P = π^2EI/4l^2

c) P= 4π^2EI/l^2

d) none of the above

34 / 50

34. Shape of the bending moment diagram for a simply supported beam having a point load at the center is

a) parabolic

b) square

c) rectangular

d) triangular

35 / 50

35. The expression EI(d^4y/dx^4) at any section for a beam is equal to

a) load intensity at the section

b) shear force at the section

c) BM at the section

d) slope of the section

36 / 50

36. The difference between SF values at any two sections will be equal to

a) the area of bending moment between the two sections

b) the difference between the slopes of the curve of the loading diagram at two sections

c) the ordinate of shear force diagram at one section plus the slope of the loading diagram multiplied by the distance between two sections

d) the area of the loading diagram between those two sections

37 / 50

37. The zone between the elastic limit and proportional limit on the elastic curve of an elastic material is known as

a) linear elastic zone

b) non-linear elastic zone

c) plastic zone

d) none of the above

38 / 50

38. *The maximum deflection of a simply supported beam subjected to a concentrated load (W) at the midpoint is

a) WL^3 / 8EI

b) WL^3 / 48EI

c) 5WL^3 / 48EI

d) none of the above

39 / 50

39. *Thrust is induced in the case of

a) vertical load

b) inclined load

c) vertical & inclined load

d) none of the above

40 / 50

40. The maximum bending moment caused by a moment M applied at a distance 'a' from one end on a simply supported beam is.... (where L=span, a>L/2)

a) M

b) Ma/L

c) M(L-a)/L

d) ML/a

41 / 50

41. *As per the elastic theory of design, the factor of safety is the ratio of

a) working stress to field stress

b) yield stress to working stress

c) ultimate stress to yield stress

d) ultimate load to load at yield

42 / 50

42. *The ratio of the largest load in a test to the original cross-sectional area of the piece is called:

a) elastic limit

b) ultimate stress

c) yield stress

d) breaking stress

43 / 50

43. Load carrying capacity of fixed beam is

a) lesser than simply supported beam

b) lesser than the cantilever beam

c) greater than simply supported beam and cantilever beam

d) all of the above

44 / 50

44. The value of Poisson's ratio always remains

a) greater than one

b) lesser than one

c) equal to one

d) none of these

45 / 50

45. Shear force diagram for a cantilever carrying a UDL over its whole length is

a) rectangle

b) triangle

c) parabola

d) cubic parabola

46 / 50

46. The reaction at end A of the beam shown is

a) 9 kN

b) 3 kN

c) 18 kN

d) zero

47 / 50

47. 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

48 / 50

48. *The ratio of change in volume to the original volume is called:

a) linear strain

b) lateral strain

c) volumetric strain

d) Poisson's ratio

49 / 50

49. 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

50 / 50

50. *Moment of inertia of an object having rectangular section of 'b' as width and 'd' as depth is given by:

a) bd^3/12

b) bd^2/24

c) b^2d^2/12

d) db^3/24

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