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. 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

2 / 50

2. The maximum deflection of a beam occurs at

a) zero shear force location

b) zero slope location

c) zero bending moment location

d) none of the above

3 / 50

3. 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

4 / 50

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

a) brass

b) timber

c) mild steel

d) copper

5 / 50

5. The slope of the curve of S.F. diagram at any section will be equal to

a) the slope of loading at that section

b) the ordinate of loading diagram at that section

c) the area of loading diagram from end to that section

d) the bending moment at that section

6 / 50

6. 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

7 / 50

7. *As the elastic limit reaches, tensile strain

a) decreases more rapidly

b) increases more rapidly

c) decreases in proportion to the stress

d) increases in proportion to the stress

8 / 50

8. The rate of change of shear force is called

a) BM

b) point load

c) intensity of load

d) slope

9 / 50

9. *The maximum BM produced in a simply supported beam having a span of 4 m and subjected to a UDL of 10 kN/m

a) 10 kN-m

b) 20 kN-m

c) 30 kN-m

d) 40 kN-m

10 / 50

10. *The compression test is commonly used for testing

a) ductile materials

b) rubber

c) brittle materials

d) none of the above

11 / 50

11. *A truss is completely analyzed, when

a) the direct stress in all the members are found

b) all the external reaction components are determined

c) the equilibrium is satisfied

d) none of the above

12 / 50

12. *The shear flow in a section can be defined as

a) total shear stress

b) flow direction of shear

c) total shear stress at a point

d) none of the above

13 / 50

13. The strain energy stored by a member when strained within the elastic limit is known as

a) resilience

b) proof resilience

c) potential strain

d) none of the above

14 / 50

14. 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

15 / 50

15. Permanent set is

a) the force that acts permanently on the body

b) irrecoverable deformation in the body

c) the shape of the member just after the completion of construction

d) the ratio of Poisson's ratio to Young's modulus

16 / 50

16. 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

17 / 50

17. *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

18 / 50

18. 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

19 / 50

19. A body having similar properties throughout

a) homogeneous

b) isomorphic

c) isotropic

d) anisotropy

20 / 50

20. The method of increasing fatigue resistance by overstressing the metal by successively increasing the loading is known as

a) compounding

b) coaxing

c) relaxing

d) enduring

21 / 50

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

a) maximum

b) zero

c) minimum

d) no relation

22 / 50

22. 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

23 / 50

23. 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

24 / 50

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

a) y

b) dy/dx

c) d²y/dx²

d) d^3y/dx²

25 / 50

25. *The centre of gravity of a triangle is at the point where three

a) medians of the triangle meet

b) perpendicular bisectors of the sides of the triangle meet

c) bisectors of the angle of the triangle meet

d) none of these

26 / 50

26. *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

27 / 50

27. *"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

28 / 50

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

a) 1

b) 2

c) 3

29 / 50

29. 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

30 / 50

30. 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

31 / 50

31. Find the maximum BM induced in a simply supported 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) 8 KN-m

b) 4 KN-m

c) 2 KN-m

d) 1 KN-m

32 / 50

32. *The forces which meet at one point, but their lines of action do not lie in a plane, are called:

a) co-planer non-concurrent forces

b) non-coplanar concurrent forces

c) non-coplanar non-concurrent forces

d) none of the above

33 / 50

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

a) 2P

b) 4P

c) P/8

d) P/16

34 / 50

34. *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

35 / 50

35. 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

36 / 50

36. The shear center in the case of a T-beam section is

a) at the C.G. of the section

b) at the neutral axis of the section

c) on the C.G. horizontal plane and away from C.G. within the leg projections

d) none of the above

37 / 50

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

a) 9 kN

b) 3 kN

c) 18 kN

d) zero

38 / 50

38. 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

39 / 50

39. 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

40 / 50

40. Point of contraflexure is a point where bending moment

a) minimum

b) maximum

c) zero

d) changes sign

41 / 50

41. For a column of given material, the Rankine's constant depends on

a) length of the column.

b) diameter of column

c) moment of inertia of column

d) none of the above

42 / 50

42. *Which of the following sections is the most efficient in carrying bending moments

a) rectangular section

b) circular section

c) I-section

d) T-section

43 / 50

43. 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

44 / 50

44. *Maximum deflection of a simply supported beam subjected to concentrated load (w) at the mid-point is

a) wL^3 / 8EI

b) wL^3 / 48EI

c) 5wL^3 / 48EI

d) none of the above

45 / 50

45. 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

46 / 50

46. *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

47 / 50

47. The equivalent length of column fixed at one end and free at the other end is

a) 2l

b) 0.75l

c) 1l

d) 1.25l

48 / 50

48. *The property of a material by which a body returns to its original shape after removal of the force is called

a) plasticity

b) elasticity

c) ductility

d) malleability

49 / 50

49. If the length of a simply supported beam carrying a concentrated load at the center is doubled, the deflection at the center will become

a) two times

b) four times

c) eight times

d) sixteen times

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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