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. 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

2 / 50

2. 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

3 / 50

3. 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

4 / 50

4. *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.

5 / 50

5. *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

6 / 50

6. 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

7 / 50

7. 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

8 / 50

8. What is tenacity?

a) ultimate strength in tension

b) ultimate strength in compression

c) ultimate shear strength

d) ultimate impact strength

9 / 50

9. 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

10 / 50

10. *A member with a cross section of a mm^2 is subjected to a force of P N. It is L mm long and of Young's Modulus, E N/mm^2. The strain will be

a) PL/AE(n/mm)

b) PA/LE(N/mm^2)

c) P/AE(mm/mm)

d) AP/LE(mm/mm)

11 / 50

11. *The product EI is called

a) flexural rigidity

b) torsional rigidity

c) second moment of area

d) none of the above

12 / 50

12. *"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

13 / 50

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

a) zero

b) one

c) two

d) three

14 / 50

14. *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

15 / 50

15. Which of the following is a relatively ductile material?

a) cast iron

b) wrought iron

c) mild steel

d) bronze

16 / 50

16. *BM in a cantilever beam having a span of 1.8m and a uniformly distributed load of 4kg/m

a) 4.48 kg-m

b) 5.48 kg-m

c) 6.48 kg-m

d) none of the above

17 / 50

17. An orthotropic material has

a) inelastic properties

b) non-homogeneous properties

c) the same properties in an orthogonal direction

d) different properties in three perpendicular directions

18 / 50

18. A beam of uniform strength will have at every cross-section the same

a) deflection

b) stiffness

c) BM

d) bending stress

19 / 50

19. 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

20 / 50

20. 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

21 / 50

21. The impact tests are used to determine

a) ultimate crushing strength

b) toughness

c) ductility

d) tenacity

22 / 50

22. The property of material by which it can be drawn, due to tension, to a smaller section, is called

a) plasticity

b) ductility

c) elasticity

d) malleability

23 / 50

23. If a material has identical properties in all directions, it is said to be

a) homogeneous

b) isotropic

c) elastic

d) orthotropic

24 / 50

24. Rate of change of bending moment is equal to

a) shear force

b) slope

c) deflection

d) none of the above

25 / 50

25. The radius of gyration of a rectangular section is not proportional to

a) the square root of the moment of inertia

b) the square root of the inverse of the area

c) the square root of the moment of inertia divided by the area of the section

d) none of the above

26 / 50

26. *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

27 / 50

27. The diagram showing the variation of axial load along the span is called

a) thrust diagram

b) shear force diagram

c) bending moment diagram

d) none of the above

28 / 50

28. 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

29 / 50

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

a) 1

b) 2

c) 4

30 / 50

30. *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

31 / 50

31. The moment of inertia of a rectangular (Bx D) section about its base is

a) BD^3/12

b) DB^3/12

c) BD^3/3

d) DB^3/3

32 / 50

32. 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

33 / 50

33. *The inclined member carrying compressive load in the case of frames and trusses is

a) Post

b) stanchion

c) strut

d) column

34 / 50

34. The crippling load for column of length 1, with one end fixed and the other end free is

a) P = π^2EI/4l^2

b) P= π^2EI/l^2

c) P= 4π^2EI/l^2

d) P= π^2EI/l

35 / 50

35. *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

36 / 50

36. 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

37 / 50

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

a) y

b) dy/dx

c) d²y/dx²

d) d^3y/dx²

38 / 50

38. 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

39 / 50

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

a) malleability

b) ductility

c) plasticity

d) elasticity

40 / 50

40. 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

41 / 50

41. 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

42 / 50

42. 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

43 / 50

43. A body having similar properties throughout

a) homogeneous

b) isomorphic

c) isotropic

d) anisotropy

44 / 50

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

a) 1

b) 2

c) 3

d) 4

45 / 50

45. The beam strongest in flexure will have the maximum

a) moment of inertia

b) section modulus

c) area of cross-section

d) none of the above

46 / 50

46. 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

47 / 50

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

a) brass

b) timber

c) mild steel

d) copper

48 / 50

48. 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

49 / 50

49. The c.g. of a semi-circular arc is

a) r/π

b) r/2π

c) r/3π

d) 2r/π

50 / 50

50. 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

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