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 phenomenon of decreased resistance of material due to the reversal of stress is called

a) creep

b) fatigue

c) elasticity

d) plasticity

2 / 50

2. *The maximum deflection of a simply supported beam subjected to a concentrated load (W) at the midpoint is

a) WL^3 / 8EI

b) WL^3 / 48EI

c) 5WL^3 / 48EI

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. *Tensile internal force tends to:

a) crush the member

b) elongate the member

c) shorten the member

d) smash the member

5 / 50

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

a) Post

b) stanchion

c) strut

d) column

6 / 50

6. 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

7 / 50

7. 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

8 / 50

8. *The magnitude of a shear force at a distance of L/4 from either end of a simply supported beam with load P applied at midspan is equal to:

a) P

b) P/2

c) P/4

d) P/8

9 / 50

9. *Toughness is

a) the ability to absorb energy during plastic deformation

b) higher ultimate strength

c) stress at field

d) strain energy at field

10 / 50

10. If the value of Young's Modulus of elasticity for a material is zero, it implies that the material is

a) incompressible

b) compressible

c) plastic

d) visco elastic

11 / 50

11. Point of contraflexure is a point where bending moment

a) minimum

b) maximum

c) zero

d) changes sign

12 / 50

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

a) 9 kN

b) 3 kN

c) 18 kN

d) zero

13 / 50

13. *The slope of an elastic curve at the point of contraflexture

a) must be equal to zero

b) greater than zero

c) need not be equal to zero

d) none of the above

14 / 50

14. The maximum bending moment caused on a simply supported beam subjected to two equal concentrated loads (W/2) spaced at an equal distance (L/3) over the span is

a) WL/8

b) WL/6

c) WL/4

d) WL/2

15 / 50

15. 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

16 / 50

16. "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

17 / 50

17. *Thrust is induced in the case of

a) vertical load

b) inclined load

c) vertical & inclined load

d) none of the above

18 / 50

18. The bending moment in a cable carrying a system of loads will be

a) zero at all point

b) minimum at the center

c) maximum at the center

d) none of the above

19 / 50

19. 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

20 / 50

20. In a simply supported beam with span, L subjected to a point load, W at the center. Find the maximum bending moment induced in the beam

a) WL/2

b) WL/3

c) WL/4

d) WL/8

21 / 50

21. *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

22 / 50

22. *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

23 / 50

23. *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

24 / 50

24. *Strut is a

a) horizontal member

b) vertical member

c) inclined member

d) compression member

25 / 50

25. *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

26 / 50

26. In rectangular column having cross section b X h, the core is

a) rectangle of lengths b/2 and h/2

b) square of lengths b/2

c) rhombus of lengths h/2

d) rhombus of diagonals b/3 and h/3

27 / 50

27. *If a cantilever beam of 8m long has a uniformly distributed load of 2KN/m throughout the length and a 10KN point load at the center of the beam, find the moment at the center:

a) 8 KN-m

b) 16 KN-m

c) 32 KN-m

d) 44 KN-m

28 / 50

28. 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

29 / 50

29. What is strain energy?

a) stress x strain

b) volume x stress x strain

c) energy that is spent for straining a body

d) energy stored in a body because of being strained

30 / 50

30. *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

31 / 50

31. In the case of a simply supported beam subjected to UDL, the maximum shear force occurs at a point

a) support

b) centre

c) 1/3

d) none of the above

32 / 50

32. 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

33 / 50

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

a) r/π

b) r/2π

c) r/3π

d) 2r/π

34 / 50

34. The ratio of elongations of a conical bar due to its own weight and that of a prismatic bar of the same length is

a) 1/6

b) 1/5

c) 1/4

d) 1/3

35 / 50

35. The point of contraflexure occurs in a beam

a) cantilevers only

b) simply supported only

c) overhanging only

d) all of the above

36 / 50

36. The limit of proportionality depends upon

a) area of cross-section

b) types of loading

c) types of material

d) none of the above

37 / 50

37. *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

38 / 50

38. 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

39 / 50

39. *Proof resilience is the greatest stored energy at

a) limit of proportionality

b) elastic limit

c) plastic limit

d) yield point

40 / 50

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

a) malleability

b) ductility

c) plasticity

d) elasticity

41 / 50

41. 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

42 / 50

42. 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

43 / 50

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

a) 1

b) 2

c) 3

d) 4

44 / 50

44. *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

45 / 50

45. 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

46 / 50

46. 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

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. The section modulus of a rectangular section is proportional to

a) area of the section

b) square of the area of the section

c) product of the area & depth

d) half moment of inertia of the section

49 / 50

49. 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

50 / 50

50. *Short column taking maximum load having equal section

a) sal

b) pcc

c) chir

d) none of the above

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