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. 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

2 / 50

2. 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

3 / 50

3. 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

4 / 50

4. *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

5 / 50

5. 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

6 / 50

6. *Toughness is

a) the ability to absorb energy during plastic deformation

b) higher ultimate strength

c) stress at field

d) strain energy at field

7 / 50

7. 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

8 / 50

8. 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

9 / 50

9. 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

10 / 50

10. 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

11 / 50

11. The shear force on a beam is proportional to

a) curvature of the axis

b) displacement of the axis

c) sum of the forces

d) sum of the transverse forces

12 / 50

12. Buckling load for a given column depends upon

a) length of the column only

b) least lateral dimension only

c) both length and least lateral dimension

d) none of the above

13 / 50

13. *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

14 / 50

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

a) BMD

b) SFD

c) thrust diagram

d) stress diagram

15 / 50

15. 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

16 / 50

16. 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

17 / 50

17. 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

18 / 50

18. *The maximum bending moment caused by a moving load on a simply supported beam is

a) at the support

b) under the load

c) at mid span

d) none of the above

19 / 50

19. Normally, the numerical value of Poisson's is

a) 0.3 for steel

b) 0.15 for concrete

c) both (a) and (b) of the above

d) none of the above

20 / 50

20. *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

21 / 50

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

a) homogeneous

b) isotropic

c) elastic

d) orthotropic

22 / 50

22. *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

23 / 50

23. 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

24 / 50

24. Shear force diagram for a cantilever carrying a UDL over its whole length is

a) rectangle

b) triangle

c) parabola

d) cubic parabola

25 / 50

25. 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

26 / 50

26. 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

27 / 50

27. A column that fails primarily due to buckling is known as

a) long column

b) short column

c) wear column

d) medium column.

28 / 50

28. *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

29 / 50

29. *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

30 / 50

30. The square root of the ratio of moment of inertia and cross-section area of the member is known as

a) least lateral dimension

b) second moment of inertia

c) radius of gyration

d) section modulus

31 / 50

31. An isotropic material has

a) elastic mass

b) homogeneous mass

c) elastoplastic mass

d) none of the above

32 / 50

32. The maximum bending moment caused by a moving load on a fixed-end beam occurs

a) at the support

b) under the load

c) at mid span

d) none of the above

33 / 50

33. In a fixed beam, the points of contraflexure,

a) for a UDL load are 2

b) for a concentrated load are 2

c) for a moment applied load are 2

d) all of the above

34 / 50

34. 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

35 / 50

35. 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

36 / 50

36. *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

37 / 50

37. *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

38 / 50

38. *The law which states that within elastic limits strain produced is proportional to stress producing it is known as:

a) Bernoulli's law

b) yield stress

c) Hooke's law

d) Poisson's law

39 / 50

39. 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

40 / 50

40. A Prismatic bar when subjected to pure bending assumes the shape of

a) catenary

b) parabola

c) cubic parabola

d) arc of a circle

41 / 50

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

a) bending moment

b) slope

c) deflection

d) intensity of load

42 / 50

42. *The shear force and bending moment are related by

a) V = M/Z

b) V = MY/I

c) V = dM/dx

d) V = Mdx

43 / 50

43. 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

44 / 50

44. The limit of proportionality depends upon

a) area of cross-section

b) types of loading

c) types of material

d) none of the above

45 / 50

45. The point of contraflexure occurs in a beam

a) cantilevers only

b) simply supported only

c) overhanging only

d) all of the above

46 / 50

46. 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

47 / 50

47. A perfectly elastic body is

a) that body which recovers its original shape completely after the removal of force

b) a body of such a material with a lot of extensibility

c) a body made of rubber only

d) a body whose cross-sectional dimensions are very small

48 / 50

48. What is tenacity?

a) ultimate strength in tension

b) ultimate strength in compression

c) ultimate shear strength

d) ultimate impact strength

49 / 50

49. If a cantilever beam carries a uniformly distributed load over its entire length, then the shape of the shear force diagram and bending moment diagram respectively are

a) triangle and quadratic parabola

b) quadratic parabola and cubic parabola

c) rectangle and triangle

d) quadratic parabola and rectangle

50 / 50

50. 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

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