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 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

2 / 50

2. 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

3 / 50

3. *Maximum bending moment occurs where

a) shear force is maximum

b) shear force is less than one

c) shear force changes sign

d) deflection is zero

4 / 50

4. *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

5 / 50

5. 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

6 / 50

6. 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

7 / 50

7. A member that is subjected to reversible tensile or compressible stress may fail at a stress lower than the ultimate stress of the material. The property of the metal is called

a) plasticity of the metal

b) elasticity of the metal

c) fatigue of the metal

d) workability of the metal

8 / 50

8. A body having similar properties throughout

a) homogeneous

b) isomorphic

c) isotropic

d) anisotropy

9 / 50

9. The difference in ordinate of the shear force between any two sections is equal to the area under

a) shear curve between these two sections

b) load curve between these two sections

c) bending moment curve between these two sections

d) load curve between these two sections plus concentrated load applied between the sections

10 / 50

10. *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

11 / 50

11. *When the equal and opposite forces are applied to a body, tending to elongate it, then the stress produced is called

a) compressive stress

b) tensile stress

c) shear stress

d) longitudinal stress

12 / 50

12. 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

13 / 50

13. 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

14 / 50

14. 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

15 / 50

15. *Load required to produce unit deflection is called

a) stiffness

b) ductility

c) elasticity

d) malleability

16 / 50

16. The ratio of moment of inertia of a square section to that of a circular section for a given depth is given by

a) <1

b) >1

c) 1

d) none of the above

17 / 50

17. A cantilever beam is one which is:

a) Fixed at both ends

b) Fixed at one end and free at other end

c) Supported at its ends

d) Supported on more than two supports

18 / 50

18. *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)

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. The maximum deflection in a cantilever beam carrying a concentrated load 'w' at the free end is (Where L is span of bean, W is total load and EI is flexural rigidity)

a) WL^3 / 8EI

b) WL^2 / 5EI

c) WL^3 / 3EI

d) 3WL^3 / 2EI

21 / 50

21. *A point where SF is zero, BM is

a) maximum

b) minimum

c) either maximum or minimum

d) none of the above

22 / 50

22. 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

23 / 50

23. *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

24 / 50

24. *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

25 / 50

25. A column that fails primarily due to direct stress is called

a) long column

b) short column

c) weak column

d) none of the above

26 / 50

26. *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

27 / 50

27. For a beam of uniform strength if its depth is maintained constant then its width will vary in proportion to

a) bending moment

b) (B.M)^2

c) (B.M)^3

d) (B.M)

28 / 50

28. *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

29 / 50

29. 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

30 / 50

30. *The unit failure stress is taken as :

a) rupture stress

b) ultimate stress

c) failure stress

d) fracture stress

31 / 50

31. 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

32 / 50

32. The effective length of a column effectively held in position and restrained in direction at one end will be

a) 1l

b) 1.5 l

c) 2 l

d) 3 l

33 / 50

33. 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

34 / 50

34. *The ratio of the largest load in a test to the original cross-sectional area of the piece is called:

a) elastic limit

b) ultimate stress

c) yield stress

d) breaking stress

35 / 50

35. *The simple bending equation is

a) M/y = σ/I = E/R

b) M/I = σ/y = E/R

c) M/R = σ/y = E/R

d) none of the above

36 / 50

36. *Short column taking maximum load having equal section

a) sal

b) pcc

c) chir

d) none of the above

37 / 50

37. 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

38 / 50

38. *Which of the following is dimensionless?

a) bulk modulus

b) strain

c) shear stress

d) none of the above

39 / 50

39. *As the elastic limit reaches, tensile strain

a) decreases more rapidly

b) increases more rapidly

c) decreases in proportion to the stress

d) increases in proportion to the stress

40 / 50

40. Centrifugal force acts away from the center of the path while centripetal force

a) does not act

b) away from the center of the path

c) towards the center of the path

d) all of the above

41 / 50

41. *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

42 / 50

42. *The velocity of a moving body is:

a) A vector quantity

b) A scalar quantity

c) A constant quantity

d) None of the above

43 / 50

43. *The maximum bending moment in a simply supported beam UDL is applied

a) ends

b) mid

c) 1/2 distance

d) none of the above

44 / 50

44. *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

45 / 50

45. *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

46 / 50

46. 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

47 / 50

47. 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

48 / 50

48. 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

49 / 50

49. *Strut is a

a) horizontal member

b) vertical member

c) inclined member

d) compression member

50 / 50

50. 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

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