Mechanics Of Materials & Structures Online Test

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

1. 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

2 / 50

2. *A tie is a member which

a) is subjected axial compression only

b) is subjected axial tension only

c) is subjected moment tension only

d) is subjected two equal and opposite forces.

3 / 50

3. A simply supported beam of length I carries a load varying uniformly from zero at the left end to the maximum at the right end. The maximum bending moment occurs at a distance of

a) 1/√3 from the left end

b) 1/3 from left end

c) 1/√3 from the right end

d) 1/3 from the right end

4 / 50

4. *In the case of a fixed beam loaded at a point at its center, the number of points at which BM is zero

a) 1

b) 2

c) 3

d) 4

5 / 50

5. *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

6 / 50

6. The impact tests are used to determine

a) ultimate crushing strength

b) toughness

c) ductility

d) tenacity

7 / 50

7. *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

8 / 50

8. *The rate of change of shear force is called

a) bending moment

b) slope

c) deflection

d) intensity of load

9 / 50

9. "When a rectangular beam is loaded transversely the maximum compressive stress is developed on the :

a) top layer

b) bottom layer

c) neutral axis

d) every cross section

10 / 50

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

a) malleability

b) ductility

c) plasticity

d) elasticity

11 / 50

11. The bending moment acting on the plane of an element will cause the following type of stress on the plane

a) normal stress

b) tension stress

c) axial stress

d) transverse shear stress

12 / 50

12. *Centrifugal force is given by

a) v^2/R

b) mv^2/R

c) mxa

d) all of the above

13 / 50

13. The brittle materials have low toughness because they

a) have large plastic deformation before failure

b) have small plastic deformation before failure

c) have no plastic deformation before failure

d) can absorb impact load also

14 / 50

14. *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

15 / 50

15. *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

16 / 50

16. In a continuous beam, the point where bending moment changes sign is called

a) point of inflection

b) point of virtual hinge

c) point of contraflexure

d) all of the above

17 / 50

17. 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

18 / 50

18. 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

19 / 50

19. 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

20 / 50

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

a) 1

b) 2

c) 4

21 / 50

21. *Proof resilience is the greatest stored energy at

a) limit of proportionality

b) elastic limit

c) plastic limit

d) yield point

22 / 50

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

a) 9 kN

b) 3 kN

c) 18 kN

d) zero

23 / 50

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

a) L

b) 0.5L

c) 2L

d) 4L

24 / 50

24. 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

25 / 50

25. 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

26 / 50

26. 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

27 / 50

27. *The total time of collision and restitution of two bodies is called

a) time of collision

b) period of collision

c) period of impact

d) all the above

28 / 50

28. 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

29 / 50

29. 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

30 / 50

30. *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

31 / 50

31. *The tension in a cable supporting a lift

a) is more when the lift is moving downwards

b) is less when the lift is moving upwards

c) Remains constant whether it moves downwards or upwards

d) is less when the lift is moving downwards

32 / 50

32. 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

33 / 50

33. The maximum number of transverse shear forces possible at one end of an element of a plane frame are

a) zero

b) one

c) two

d) three

34 / 50

34. *Bending moment diagram of a simply supported beam having a uniformly distributed load is

a) rectangular

b) parabolic

c) triangular

d) all of the above

35 / 50

35. *The critical bending moment caused in a fixed end beam loaded with a uniformly distributed load (W = wL) throughout is

a) M = WL/4

b) M = WL/8

c) M = WL/12

d) M = WL/16

36 / 50

36. *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

37 / 50

37. An isotropic material has

a) elastic mass

b) homogeneous mass

c) elastoplastic mass

d) none of the above

38 / 50

38. 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

39 / 50

39. *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

40 / 50

40. *Which of the following gives Modulus of Elasticity

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

41 / 50

41. *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

42 / 50

42. *"If a rod is simultaneously pulled at both of its ends, it will be a case of:

a) axial loading

b) vertical loading

c) horizontal loading

d) none of these

43 / 50

43. Find the slenderness ratio of the column of M.I. = 10000cm4, Area =100cm^2 & effective length =3.0m

a) 3

b) 30

c) 4

d) 40

44 / 50

44. *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

45 / 50

45. 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

46 / 50

46. *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

47 / 50

47. The moment of inertia of an area will be least with respect to

a) central axis

b) horizontal axis

c) vertical axis

d) none of the above

48 / 50

48. Find the value of thrust, if the member (beam) is subjected to an inclined force having a magnitude of 5 kN and an inclination with the vertical of 30°

a) 2.5 kN

b) 5 kN

c) 2.5 √3 kN

d) 7.5 kN

49 / 50

49. 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

50 / 50

50. 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

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