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. 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

2 / 50

2. *Thrust is induced in the case of

a) vertical load

b) inclined load

c) vertical & inclined load

d) none of the above

3 / 50

3. The rate of change of shear force is called

a) BM

b) point load

c) intensity of load

d) slope

4 / 50

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

a) 1

b) 2

c) 4

5 / 50

5. *"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

6 / 50

6. The difference between SF values at any two sections will be equal to

a) the area of bending moment between the two sections

b) the difference between the slopes of the curve of the loading diagram at two sections

c) the ordinate of shear force diagram at one section plus the slope of the loading diagram multiplied by the distance between two sections

d) the area of the loading diagram between those two sections

7 / 50

7. A beam is supported over three rollers lying in the same plane. The beam is stable for

a) any general loading

b) loading with no component in the direction of the beam

c) loading with no component perpendicular to the direction of the beam

d) only when no load except self-weight acts.

8 / 50

8. *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

9 / 50

9. *Proof resilience is the greatest stored energy at

a) limit of proportionality

b) elastic limit

c) plastic limit

d) yield point

10 / 50

10. 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

11 / 50

11. *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

12 / 50

12. 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

13 / 50

13. The region of c/s of a column in which compressive load may be applied without producing tensile load is known as

a) core

b) more

c) compression area

d) tension area

14 / 50

14. *The velocity of a moving body is:

a) A vector quantity

b) A scalar quantity

c) A constant quantity

d) None of the above

15 / 50

15. *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

16 / 50

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

a) V = M/Z

b) V = MY/I

c) V = dM/dx

d) V = Mdx

17 / 50

17. *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

18 / 50

18. *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

19 / 50

19. The ratio of the effective length of a column and the minimum radius of gyration of its cross-sectional area is known as

a) buckling factor

b) slenderness ratio

c) crippling factor

d) none of the above

20 / 50

20. *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

21 / 50

21. 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

22 / 50

22. What is tenacity?

a) ultimate strength in tension

b) ultimate strength in compression

c) ultimate shear strength

d) ultimate impact strength

23 / 50

23. Effective length of column fixed at one end and hinged at the other end is

a) 1/2

b) 1/√2

c) 1l

d) 1.25l

24 / 50

24. The stress necessary to initiate yielding is considerably

a) more than necessary to continue it

b) less than necessary to continue it

c) more than necessary to stop it

d) less than necessary to stop it

25 / 50

25. 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

26 / 50

26. 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

27 / 50

27. *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

28 / 50

28. *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

29 / 50

29. 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

30 / 50

30. The slope of the curve of B.M. diagram at any section will be equal to

a) the slope of loading at that section

b) the slope of shear force diagram at that section

c) the ordinate of shear force diagram at that section

d) the area of shear force diagram starting from any one end

31 / 50

31. 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

32 / 50

32. The maximum bending moment in a simply supported beam loaded with a UDL of w/m having span l is

a) wl^2/2

b) wl^2/4

c) wl^2/8

d) wl^2/16

33 / 50

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

a) homogeneous

b) isotropic

c) elastic

d) orthotropic

34 / 50

34. *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

35 / 50

35. 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

36 / 50

36. *A beam is said to be loaded in pure bending when

a) Bending moment is constant

b) Bending moment is zero

c) Bending moment is changing linearly

d) Bending moment and shear force are changing linearly

37 / 50

37. Identify the correct relationship that exists among the modulus of elasticity (E), modulus of rigidity (N), and bulk modulus (k) is

a) E= 3K+N/9KN

b) E= 3KN/3K+N

c) E= 9KN/3K+N

d) E= K/N

38 / 50

38. *A beam is said to be of uniform strength if

a) bending moment is the same throughout the beam

b) deflection is the same throughout the beam

c) bending stress is the same throughout the beam

d) none of the above

39 / 50

39. The point of contraflexure occurs in a beam

a) cantilevers only

b) simply supported only

c) overhanging only

d) all of the above

40 / 50

40. 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

41 / 50

41. 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

42 / 50

42. *Fatigue is the failure of a material under:

a) constant loads but occasionally well above static load

b) varying loads, well below ultimate static load

c) constant loads well below ultimate static load

d) varying loads well above ultimate static load

43 / 50

43. *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

44 / 50

44. 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

45 / 50

45. *In a simply supported beam with span (L) having a triangular load with its intensity 0 at both ends and W at center. The maximum BM will be

a) WL/2

b) WL/2

c) WL^2/12

d) WL/9

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. *Centre of gravity of a semi-circle is... above the base AB (Dia.)

a) 2r/π

b) 4r/3π

c) r/8

d) r/4

48 / 50

48. *The compression test is commonly used for testing

a) ductile materials

b) rubber

c) brittle materials

d) none of the above

49 / 50

49. 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

50 / 50

50. *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

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