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. Rate of change of bending moment is equal to

a) shear force

b) slope

c) deflection

d) none of the above

2 / 50

2. *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

3 / 50

3. *Mathematically, strain may be defined as

a) the deformation per unit volume

b) the deformation per unit area

c) the deformation per unit length

d) all of the above

4 / 50

4. 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

5 / 50

5. *A member which does not regain its original shape after the load producing deformation is removed, is said to be:

a) plastic

b) elastic

c) rigid

d) none of the above.

6 / 50

6. The ratio of elongations of a conical bar due to its own weight and that of a prismatic bar of the same length is

a) 1/6

b) 1/5

c) 1/4

d) 1/3

7 / 50

7. *A cable subjected to U.D.L. over its entire span assumes a shape of

a) semi-circle

b) an isosceles triangle

c) parabola

d) none of the above

8 / 50

8. An isotropic material has

a) elastic mass

b) homogeneous mass

c) elastoplastic mass

d) none of the above

9 / 50

9. 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

10 / 50

10. The diagram showing the variation of BM along the span of the beam is called

a) BMD

b) SFD

c) thrust diagram

d) all of the above

11 / 50

11. *A simply supported beam as shown in the fig. carries 10 t of load. What will be the reaction at point B ?

a) 5t

b) 4.5 t

c) 4t

d) 3 t

12 / 50

12. The number of reaction components at a hinged end of a general loading is

a) 1

b) 2

c) 3

d) 4

13 / 50

13. *Tensile internal force tends to:

a) crush the member

b) elongate the member

c) shorten the member

d) smash the member

14 / 50

14. *Which of the following gives Bulk Modulus?

a) the ratio of linear stress to linear strain

b) the ratio of shear stress to shear strain

c) the ratio of lateral strain to longitudinal strain

d) the ratio of the normal stress of equal magnitude on all six faces of a solid cube to the volumetric strain

15 / 50

15. 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

16 / 50

16. 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

17 / 50

17. *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

18 / 50

18. The shear force on a beam and the displacement are related by

a) V = EI(d^2y/dx^2)

b) V = EI(d^3y/dx^2)

c) V = EI(d^3y/dx^3)

d) none of the above

19 / 50

19. Find the bending moment at the center and also find the maximum bending moment

a) 10 kN-m, 12 kN-m

b) 15 kN-m, 10 kN-m

c) 20 kN-m, 12 kN-m

d) 10 kN-m, 15 kN-m

20 / 50

20. The value of buckling load is ... than the crushing load in the case of a long column

a) less

b) more

c) equal

d) none of the above

21 / 50

21. *Toughness is

a) the ability to absorb energy during plastic deformation

b) higher ultimate strength

c) stress at field

d) strain energy at field

22 / 50

22. *The relation between the radius of curvature (R), bending moment (M), and flexural rigidity (EI) is given by

a) M = EI/R

b) M = E/IR

c) EI = R/M

d) MI/R = E

23 / 50

23. In the case of an H section, the maximum shear stress will occur at

a) top fibers

b) neutral axis

c) bottom fibers

d) at the junction of web and flanges

24 / 50

24. Find the maximum SF induced in S.S beam if the beam is subjected to a point load of 4 KN at the center of the beam and the span of the beam is 4 m

a) 1 KN

b) 2 KN

c) 4 KN

d) 8 KN-m

25 / 50

25. 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

26 / 50

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

a) maximum

b) minimum

c) either maximum or minimum

d) none of the above

27 / 50

27. 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

28 / 50

28. *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

29 / 50

29. The variation of the bending moment in the segment of a beam where no external load is present is

a) linear

b) parabolic

c) cubic

d) rectangular

30 / 50

30. *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

31 / 50

31. The relation between deflection (y) and bending moment (M) is

a) M = EI(dy/dx)

b) M =-EI(d²y/dx²)

c) M = EI(d²y/dx]

d) none of the above

32 / 50

32. 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

33 / 50

33. *The stress at which the extension of a material takes place more quickly as compared to the increase in load is called

a) elastic limit

b) plastic limit

c) breaking point

d) yielding point

34 / 50

34. If the stress produced by a prismatic bar is equal to the working stress, the area of the cross-section of the prismatic bar becomes

a) zero

b) infinite

c) maximum

d) minimum

35 / 50

35. The slope of the curve of B.M. diagram at any section will be equal to

a) the slope of loading at that section

b) the slope of shear force diagram at that section

c) the ordinate of shear force diagram at that section

d) the area of shear force diagram starting from any one end

36 / 50

36. Which of the following materials will have the highest Young's Modulus?

a) brass

b) timber

c) mild steel

d) copper

37 / 50

37. In a beam where shear force is maximum, the bending moment will be

a) maximum

b) zero

c) minimum

d) no relation

38 / 50

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

a) y

b) dy/dx

c) d²y/dx²

d) d^3y/dx²

39 / 50

39. *A diagram that shows the variation of axial force

a) BMD

b) SFD

c) thrust diagram

d) stress diagram

40 / 50

40. A column that fails primarily due to direct stress is called

a) long column

b) short column

c) weak column

d) none of the above

41 / 50

41. In the case of a simply supported beam subjected to UDL, the maximum shear force occurs at a point

a) support

b) centre

c) 1/3

d) none of the above

42 / 50

42. In rectangular column having cross section b X h, the core is

a) rectangle of lengths b/2 and h/2

b) square of lengths b/2

c) rhombus of lengths h/2

d) rhombus of diagonals b/3 and h/3

43 / 50

43. *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

44 / 50

44. For a beam of uniform strength if its depth is maintained constant then its width will vary in proportion to

a) bending moment

b) (B.M)^2

c) (B.M)^3

d) (B.M)

45 / 50

45. 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

46 / 50

46. A beam fixed at both ends with a central load W in the middle will have zero bending moment

a) at one place

b) at two places

c) at three places

d) none of the above

47 / 50

47. 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

48 / 50

48. For a column, with both ends fixed, the crippling load will be equal to

a) 2P

b) 4P

c) P/8

d) P/16

49 / 50

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

a) inversely proportional

b) directly proportional

c) curvilinear related

d) all of the above

50 / 50

50. *The variation of the bending moment in the segment of a beam where the load is uniformly distributed is

a) linear

b) parabolic

c) cubic

d) rectangular

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