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 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

2 / 50

2. 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

3 / 50

3. 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

4 / 50

4. 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

5 / 50

5. *Dead load of a member is the

a) one that remains constant

b) one that occurs due to the dead body

c) one that comes all of a sudden

d) one that comes due to the self-weight of the object

6 / 50

6. *A beam is said to be of uniform strength if

a) bending moment is the same throughout the beam

b) deflection is the same throughout the beam

c) bending stress is the same throughout the beam

d) none of the above

7 / 50

7. *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

8 / 50

8. The bending moment diagram for a cantilever beam subjected to a moment at the end of the beam would be

a) rectangle

b) triangle

c) parabola

d) cubic parabola

9 / 50

9. The difference between BM values at any two sections will be equal to

a) the area of SF diagram between those two sections

b) the area of loading diagram between the two sections

c) the area of loading diagram

d) the area of bending moment between the two sections

10 / 50

10. *Centre of gravity of a semi-circle is... above the base AB (Dia.)

a) 2r/π

b) 4r/3π

c) r/8

d) r/4

11 / 50

11. 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

12 / 50

12. 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

13 / 50

13. 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

14 / 50

14. A brittle material has

a) no plastic zone

b) no inelastic zone

c) a very little plastic zone

d) a large plastic zone

15 / 50

15. *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

16 / 50

16. 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

17 / 50

17. *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

18 / 50

18. For keeping the stress wholly permissible, the load may be applied to a circular column anywhere within a concentric circle of diameter

a) d/2

b) d/3

c) d/4

d) d/5

19 / 50

19. *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

20 / 50

20. 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

21 / 50

21. *If a beam is loaded transversely, the maximum compressive stress develops on

a) top fiber

b) neutral axis

c) bottom fiber

d) every cross-section

22 / 50

22. The number of points of contraflexture in a simply supported beam carrying udl is

a) 1

b) 2

c) 3

23 / 50

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

a) maximum

b) zero

c) minimum

d) no relation

24 / 50

24. *Short column taking maximum load having equal section

a) sal

b) pcc

c) chir

d) none of the above

25 / 50

25. A section of a beam is said to be in pure bending if it is subjected to

a) constant bending moment and constant shear force

b) constant bending moment and zero shear force

c) constant shear force and zero bending moment

d) none of the above

26 / 50

26. If a constant section is subjected to a uniform/ pure bending moment throughout, its length bends to

a) circular arc

b) parabolic arc

c) catenary

d) all of the above

27 / 50

27. The shear center may be defined as

a) the point through which the resultant of the shear stress pass

b) the point about which the moment of shear flow is zero

c) the center of gravity of the section

d) none of the above

28 / 50

28. A cantilever beam of span 4m and carrying a point load of 10 kN located at 3m from the fixed end. Find the BM at the fixed and free end

a) 30 kN-m, 0

b) 30 kN-m, 10 kN-m

c) 10 kN-m, 30 kN-m

d) none of the above

29 / 50

29. *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

30 / 50

30. The slenderness ratio of a vertical column of square cross-section of 10 cm side and 500 cm long is

a) 117.2

b) 17.3

c) 173.2

d) 137.2

31 / 50

31. 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

32 / 50

32. Maximum bending moment occurs at the center if the simply supported beam is subjected to

a) point load of center

b) uniformly distributed load throughout the span

c) triangular load with maximum intensity at the center

d) all of the above

33 / 50

33. In a beam, the neutral plane

a) may be at its centre

b) passes through the c.g. of the area of c/s

c) does not change during deformation

d) none of the above

34 / 50

34. *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

35 / 50

35. 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

36 / 50

36. 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

37 / 50

37. *Compression members always tend to buckle in the direction of the

a) parallel to the axis of the load

b) perpendicular to the axis of the load

c) least radius of gyration

d) least cross-section

38 / 50

38. 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

39 / 50

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

a) breaking point

b) plastic point

c) yielding point

d) elastic point

40 / 50

40. The rate of change of shear force is called

a) BM

b) point load

c) intensity of load

d) slope

41 / 50

41. The maximum deflection in a cantilever beam carrying a uniformly distributed load (w) over spans is (Where L is span of beam, W is total load and EI is flexural rigidity)

a) 3WL^3 / 2EI

b) WL^3 / 8EI

c) WL^3 / 5EI

d) WL^3 / 3EI

42 / 50

42. 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

43 / 50

43. 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

44 / 50

44. 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

45 / 50

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

a) 9 kN

b) 3 kN

c) 18 kN

d) zero

46 / 50

46. *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

47 / 50

47. Centrifugal force acts at a curve

a) along the center line

b) towards the center

c) away from the center

d) all of the above

48 / 50

48. *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

49 / 50

49. *The bending moment at a section tends to bend or deflect the beam and internal stresses resist its bending. The resistance offered by the internal stress to the bending, is called:

a) compressive stress

b) shear stress

c) bending stress

d) elastic modulus

50 / 50

50. *Tensile internal force tends to:

a) crush the member

b) elongate the member

c) shorten the member

d) smash the member

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