About Strength of Materials

Following are some of the multiple choice questions on the Strength of Materials with answers that will help the students in developing their knowledge.

Strength of Materials MCQ

1. The algebraic sum of moments of the forces forming couple about any point in their plane is

  • equal to the moment of the couple
  • constant
  • both of above are correct
  • both of above are wrong

2. A composite shaft consisting of two stepped portions having spring constants k1 and k2 is held between two rigid supports at the ends. Its equivalent spring constant is

  • k1+k2
  • K1+K2/2
  • K1K2/K1+K2
  • K1+K2/K1K2

3. If a number of forces act simultaneously on a particle, it is possible

  • Not a replace them by a single force
  • To replace them by a single force
  • To replace them by a single force through G.
  • To replace them by a couple

4. The object of caulking in a riveted joint is to make the joint

  • free from corrosion
  • stronger in tension
  • free from stresses
  • leak-proof

5. Limiting force of friction is the

  • Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
  • Ratio of limiting friction and normal reaction
  • The friction force acting when the body is just about to move
  • The friction force acting when the body is in motion

6. A pair of smith’s tongs is an example of the lever of

  • zeioth order
  • first order
  • second order
  • third order

7. Two coplanar couples having equal and opposite moments

  • Balance each other
  • Produce a couple and an unbalanced force
  • Are equivalent
  • Produce a moment of couple

8. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than

  • Two members with unknown forces of the frame
  • Three members with unknown forces of the frame
  • Four members with unknown forces of the frame
  • Three members with known forces of the frame

9. The neutral axis of the cross-section a beam is that axis at which the bending stress is

  • zero
  • minimum
  • maximum
  • infinity

10. A load which is spread over a beam in such a manner that it varies uniformly over the whole length of abeam is called uniformly __________ load.

  • distributed
  • varying

11. Whenever a material is loaded within elastic limit, stress is __________ strain.

  • equal to
  • directly proportional to
  • inversely proportional to
  • All of above

12. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.

  • single riveted
  • double riveted

13. The strain energy stored in a solid circular shaft subjected to shear stress (τ) is (where C = Modulus of rigidity for the shaft material)

  • x Volume of shaft
  • x Volume of shaft
  • x Volume of shaft
  • x Volume of shaft

14. The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called

  • elastic limit
  • yield point
  • ultimate point
  • breaking point

15. A beam supported at its both ends is not a simply supported beam.

  • True
  • False

16. In a simple bending of beams, the stress in the beam varies

  • linearly
  • parabolically
  • hyperbolically
  • elliptically

17. The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.

  • same
  • double
  • four times
  • six times

18. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is

  • 0.20
  • 0.30
  • 0.50
  • 0.60

19. A concentrated load is one which

  • acts at a point on a beam
  • spreads non-uniformly over the whole length of a beam
  • spreads uniformly over the whole length of a beam
  • varies uniformly over the whole length of a beam

20. Resilience is the

  • energy stored in a body when strained within elastic limits
  • energy stored in a body when strained upto the breaking of the specimen
  • maximum strain energy which can be stored in a body
  • none of the above

21. If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to (where M = Bending moment)

  • M
  • M
  • M2
  • M3

22. In order to know whether a column is long or short, we must know its slenderness ratio.

  • True
  • False

23. The limit of eccentricity is based upon no tension condition.

  • True
  • False

24. When a bar is cooled to - 5°C, it will develop

  • no stress
  • shear stress
  • tensile stress
  • compressive stress

25. When shear force at a point is zero, then bending moment is __________ at that point.

  • zero
  • minimum
  • maximum
  • infinity

26. The bending stress in a beam is __________ section modulus.

  • directly proportional to
  • inversely proportional to

27. In compression test, the fracture in cast iron specimen would occur along

  • the axis of load
  • an oblique plane
  • at right angles to the axis of specimen
  • would not occur

28. The energy stored in a body when strained within elastic limit is known as

  • resilience
  • proof resilience
  • strain energy
  • impact energy

29. The maximum stress produced in a bar of tapering section is at

  • smaller end
  • larger end
  • middle
  • anywhere

30. The simply supported beam 'A' of length l carries a central point load W. Another beam 'B' is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum deflections between beams A and B is

  • 5/8
  • 8/5
  • 5/4
  • 4/5

31. The point of contraflexure is a point where

  • shear force changes sign
  • bending moment changes sign
  • shear force is maximum
  • bending moment is maximum

32. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

  • top layer
  • bottom layer
  • neutral axis
  • every cross-section

33. The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)

  • x τ x D3
  • x τ x D3
  • x τ x D3
  • x τ x D3

34. Strain rosettes are used to

  • measure shear strain
  • measure linear strain
  • measure volumetric strain
  • relieve strain

35. A thin cylindrical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is

  • (m - 1)/ (2m - 1)
  • (2m - 1)/ (m - 1)
  • (m - 2)/ (3m - 4)
  • (m - 2)/ (5m - 4)

36. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is

  • 1/8
  • 1/4
  • 1/2
  • 2

37. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

  • t
  • 2t
  • 4t
  • 8t

38. The bending moment at a point on a beam is the algebraic __________ of all the moments on either side of the point.

  • sum
  • difference

39. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is compressive.

  • True
  • False

40. In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.

  • equal to
  • less than
  • more than
  • All of above

41. A masonry dam may fail due to

  • tension in the masonry of the dam and its base
  • overturning of the dam
  • crushing of masonry at the base of the dam
  • any one of the above

42. If the slenderness ratio for a column is 100, then it is said to be a __________ column.

  • long
  • medium
  • short
  • None of these

43. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is

  • [p (r₀² + ri²)] / (r₀² - ri²)
  • [p (r₀² - ri²)] / (r₀² + ri²)
  • 2pri²/ (r₀² - ri²)
  • (r₀² - ri²) / 2pri²

44. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.

  • equal to
  • one-half
  • twice
  • four times

45. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce

  • no stress
  • shear stress
  • tensile stress
  • compressive stress

46. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

  • 400 MPa
  • 500 MPa
  • 900 MPa
  • 1400 MPa

47. Euler's formula holds good only for

  • short columns
  • long columns
  • both short and long columns
  • weak columns

48. Strain energy is the

  • energy stored in a body when strained within elastic limits
  • energy stored in a body when strained upto the breaking of a specimen
  • maximum strain energy which can be stored in a body
  • proof resilience per unit volume of a material

49. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the

  • axis of load
  • perpendicular to the axis of load
  • maximum moment of inertia
  • minimum moment of inertia

50. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

  • density of metal can’t be determined
  • metal is twice as dense as water
  • metal will float in water
  • metal is twice as dense as unknown fluid

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