1. Strength of Materials – 100 One-Liner MCQs

 

Strength of Materials – 100 One-Liner MCQs 

#SSC JE , #RRB JE , #JE

1. Stress is defined as
   A) Load/Area ✔️
   B) Area/Load
   C) Load×Area
   D) Area²/Load
   Ans: A

2. Strain is the ratio of
   A) Change in length to original length ✔️
   B) Load to area
   C) Stress to strain
   D) Force to length
   Ans: A

3. Unit of stress is
   A) N/m² ✔️
   B) N
   C) m²
   D) kg
   Ans: A

4. Hooke’s law is valid up to
   A) Elastic limit ✔️
   B) Yield point
   C) Breaking point
   D) Ultimate stress
   Ans: A

5. Young’s modulus is ratio of
   A) Stress/Strain ✔️
   B) Strain/Stress
   C) Load/Area
   D) Force/Length
   Ans: A

6. Bulk modulus relates to
   A) Volumetric strain ✔️
   B) Linear strain
   C) Shear strain
   D) Thermal strain
   Ans: A

7. Modulus of rigidity relates to
   A) Shear stress & shear strain ✔️
   B) Normal stress & strain
   C) Volumetric stress
   D) Bending stress
   Ans: A

8. Poisson’s ratio is
   A) Lateral strain/Longitudinal strain ✔️
   B) Longitudinal/Lateral
   C) Stress/Strain
   D) Load/Area
   Ans: A

9. Value of Poisson’s ratio lies between
   A) 0 to 0.5 ✔️
   B) 0.5 to 1
   C) 1 to 2
   D) −1 to 1
   Ans: A

10. Ultimate stress is
    A) Maximum stress material can withstand ✔️
    B) Elastic stress
    C) Yield stress
    D) Breaking stress
    Ans: A

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11. Factor of safety =
    A) Ultimate stress / Working stress ✔️
    B) Working/Ultimate
    C) Yield/Working
    D) Breaking/Area
    Ans: A

12. Brittle materials fail mainly by
    A) Tensile stress ✔️
    B) Compressive stress
    C) Shear stress
    D) Torsion
    Ans: A

13. Ductile materials show
    A) Large plastic deformation ✔️
    B) No deformation
    C) Sudden failure
    D) No necking
    Ans: A

14. Resilience is
    A) Energy absorbed in elastic limit ✔️
    B) Total energy absorbed
    C) Energy at fracture
    D) Plastic energy
    Ans: A

15. Proof resilience is
    A) Maximum elastic strain energy ✔️
    B) Total strain energy
    C) Plastic energy
    D) Impact energy
    Ans: A

16. Toughness is
    A) Energy absorbed before fracture ✔️
    B) Energy in elastic range
    C) Resistance to indentation
    D) Resistance to corrosion
    Ans: A

17. Hardness means
    A) Resistance to scratching ✔️
    B) Resistance to bending
    C) Resistance to fatigue
    D) Resistance to heat
    Ans: A

18. Creep occurs mainly due to
    A) Constant load at high temperature ✔️
    B) Variable load
    C) Impact load
    D) Sudden load
    Ans: A

19. Fatigue is failure due to
    A) Repeated loading ✔️
    B) Static loading
    C) Impact loading
    D) Thermal loading
    Ans: A

20. Endurance limit is
    A) Stress below which failure never occurs ✔️
    B) Breaking stress
    C) Yield stress
    D) Ultimate stress
    Ans: A

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21. Axial deformation of a bar depends on
    A) Load, length, area, E ✔️
    B) Only load
    C) Only length
    D) Only area
    Ans: A

22. Stress in bar under axial load =
    A) P/A ✔️
    B) P×A
    C) A/P
    D) P²/A
    Ans: A

23. Thermal stress develops when
    A) Expansion is restrained ✔️
    B) Free expansion occurs
    C) Cooling only
    D) Heating only
    Ans: A

24. Thermal strain =
    A) αΔT ✔️
    B) ΔT/α
    C) α/ΔT
    D) αΔT²
    Ans: A

25. Complementary shear stresses are
    A) Equal in magnitude ✔️
    B) Unequal
    C) Opposite in direction
    D) Zero
    Ans: A

26. Principal stresses occur on planes where
    A) Shear stress is zero ✔️
    B) Normal stress is zero
    C) Bending is zero
    D) Torsion is zero
    Ans: A

27. Maximum shear stress occurs at
    A) 45° to principal plane ✔️
    B) 0°
    C) 90°
    D) 60°
    Ans: A

28. Mohr’s circle is used to find
    A) Principal stresses ✔️
    B) Bending moment
    C) Shear force
    D) Deflection
    Ans: A

29. State of pure shear has
    A) Zero normal stress ✔️
    B) Zero shear stress
    C) Equal normal stresses
    D) Only bending stress
    Ans: A

30. Maximum principal stress equals
    A) Center + radius of Mohr’s circle ✔️
    B) Center − radius
    C) Radius only
    D) Diameter
    Ans: A

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31. Neutral axis in bending passes through
    A) Centroid ✔️
    B) Top fiber
    C) Bottom fiber
    D) Shear center
    Ans: A

32. Bending stress formula is
    A) σ = My/I ✔️
    B) σ = My
    C) σ = M/I
    D) σ = Iy/M
    Ans: A

33. Maximum bending stress occurs at
    A) Farthest fiber from N.A. ✔️
    B) Neutral axis
    C) Centroid
    D) Shear center
    Ans: A

34. Section modulus Z =
    A) I/ymax ✔️
    B) I×ymax
    C) y/I
    D) A/y
    Ans: A

35. Stronger beam section is one with
    A) Larger section modulus ✔️
    B) Larger area
    C) Larger length
    D) Larger weight
    Ans: A

36. In cantilever beam, maximum BM occurs at
    A) Fixed end ✔️
    B) Free end
    C) Mid span
    D) Quarter span
    Ans: A

37. In simply supported beam with UDL, max BM at
    A) Mid span ✔️
    B) Supports
    C) Quarter span
    D) One-third span
    Ans: A

38. Shear force is maximum at
    A) Supports ✔️
    B) Mid span
    C) Neutral axis
    D) Centroid
    Ans: A

39. Point of contraflexure is where
    A) BM changes sign ✔️
    B) SF is zero
    C) Deflection is max
    D) Stress is zero
    Ans: A

40. Deflection of beam depends on
    A) EI ✔️
    B) Only load
    C) Only length
    D) Only area
    Ans: A

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41. Torsion equation is
    A) T/J = τ/R = Gθ/L ✔️
    B) T/J = σ/y
    C) M/I = σ/y
    D) P/A
    Ans: A

42. Polar moment of inertia is denoted by
    A) J ✔️
    B) I
    C) Z
    D) A
    Ans: A

43. Torsional rigidity =
    A) GJ ✔️
    B) EI
    C) EA
    D) E/G
    Ans: A

44. Shear stress in shaft varies
    A) Linearly with radius ✔️
    B) Constant
    C) Parabolic
    D) Random
    Ans: A

45. Maximum shear stress in solid shaft occurs at
    A) Outer surface ✔️
    B) Center
    C) Mid radius
    D) Neutral axis
    Ans: A

46. Hollow shaft is stronger than solid shaft of same weight because
    A) Material is away from center ✔️
    B) More area
    C) More mass
    D) Less length
    Ans: A

47. Angle of twist depends on
    A) T, L, G, J ✔️
    B) Only torque
    C) Only length
    D) Only diameter
    Ans: A

48. Power transmitted by shaft =
    A) 2πNT/60 ✔️
    B) NT
    C) T/N
    D) N/T
    Ans: A

49. Maximum shear stress theory is also called
    A) Tresca theory ✔️
    B) Rankine theory
    C) Guest theory
    D) St. Venant theory
    Ans: A

50. Maximum principal stress theory is
    A) Rankine theory ✔️
    B) Tresca theory
    C) Von Mises theory
    D) Guest theory
    Ans: A

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51. Maximum shear strain energy theory is
    A) Von Mises theory ✔️
    B) Rankine theory
    C) Tresca theory
    D) Coulomb theory
    Ans: A

52. Column fails by
    A) Buckling ✔️
    B) Bending
    C) Torsion
    D) Shear
    Ans: A

53. Slenderness ratio =
    A) Effective length / Radius of gyration ✔️
    B) Length / Area
    C) Area / Length
    D) I/A
    Ans: A

54. Euler’s formula is applicable for
    A) Long columns ✔️
    B) Short columns
    C) Intermediate columns
    D) All columns
    Ans: A

55. Critical load of column is
    A) Buckling load ✔️
    B) Breaking load
    C) Yield load
    D) Impact load
    Ans: A

56. End condition factor affects
    A) Effective length ✔️
    B) Area
    C) Stress
    D) Strain
    Ans: A

57. Rankine formula is used for
    A) All columns ✔️
    B) Only long
    C) Only short
    D) Only intermediate
    Ans: A

58. Maximum deflection of simply supported beam with UDL is at
    A) Mid span ✔️
    B) Supports
    C) One-third span
    D) Quarter span
    Ans: A

59. Strain energy stored in a body is due to
    A) Deformation ✔️
    B) Temperature
    C) Mass
    D) Gravity
    Ans: A

60. Impact factor increases when
    A) Height of fall increases ✔️
    B) Load decreases
    C) Area increases
    D) Length decreases
    Ans: A

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61. Stress concentration occurs due to
    A) Sudden change in cross-section ✔️
    B) Uniform section
    C) Long length
    D) High temperature
    Ans: A

62. Stress concentration factor =
    A) Max stress / Nominal stress ✔️
    B) Nominal/Max
    C) Load/Area
    D) Stress/Strain
    Ans: A

63. Fillets are provided to
    A) Reduce stress concentration ✔️
    B) Increase stress
    C) Reduce weight
    D) Increase stiffness
    Ans: A

64. Strain rosette is used to measure
    A) Strains in different directions ✔️
    B) Loads
    C) Deflection
    D) Temperature
    Ans: A

65. Plane stress condition occurs in
    A) Thin plates ✔️
    B) Thick blocks
    C) Shafts
    D) Columns
    Ans: A

66. Plane strain condition occurs in
    A) Long dams ✔️
    B) Thin plates
    C) Shafts
    D) Beams
    Ans: A

67. Elastic constants relation is
    A) E = 2G(1+μ) ✔️
    B) E = G/μ
    C) E = μ/G
    D) E = G(1−μ)
    Ans: A

68. Bulk modulus K relates as
    A) E = 3K(1−2μ) ✔️
    B) E = K(1+μ)
    C) E = K/μ
    D) E = K²
    Ans: A

69. Neutral layer in bending has
    A) Zero stress ✔️
    B) Max stress
    C) Max strain
    D) Max shear
    Ans: A

70. Shear stress distribution in rectangular beam is
    A) Parabolic ✔️
    B) Linear
    C) Constant
    D) Triangular
    Ans: A

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71. Max shear stress in rectangular beam occurs at
    A) Neutral axis ✔️
    B) Top fiber
    C) Bottom fiber
    D) Corners
    Ans: A

72. In circular shaft, shear stress distribution is
    A) Linear ✔️
    B) Parabolic
    C) Constant
    D) Sinusoidal
    Ans: A

73. Bending moment is zero at
    A) Free end of cantilever ✔️
    B) Fixed end
    C) Mid span
    D) Support of fixed beam
    Ans: A

74. Shear force diagram slope gives
    A) Load intensity ✔️
    B) Bending moment
    C) Deflection
    D) Stress
    Ans: A

75. Bending moment diagram slope gives
    A) Shear force ✔️
    B) Load
    C) Stress
    D) Deflection
    Ans: A

76. Cast iron is a
    A) Brittle material ✔️
    B) Ductile material
    C) Elastic material
    D) Plastic material
    Ans: A

77. Steel is generally
    A) Ductile ✔️
    B) Brittle
    C) Non-elastic
    D) Fragile
    Ans: A

78. Proof stress is used for
    A) Materials without clear yield point ✔️
    B) Brittle materials
    C) Plastics only
    D) Rubber
    Ans: A

79. Hooke’s law is
    A) Stress ∝ Strain ✔️
    B) Stress ∝ Load
    C) Stress ∝ Area
    D) Stress ∝ Length
    Ans: A

80. Modulus of elasticity indicates
    A) Stiffness ✔️
    B) Strength
    C) Toughness
    D) Hardness
    Ans: A

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81. Strain energy per unit volume is
    A) Proof resilience ✔️
    B) Toughness
    C) Hardness
    D) Ductility
    Ans: A

82. Maximum bending stress is proportional to
    A) Bending moment ✔️
    B) Shear force
    C) Deflection
    D) Area
    Ans: A

83. Buckling is
    A) Sudden lateral deflection ✔️
    B) Tensile failure
    C) Shear failure
    D) Torsional failure
    Ans: A

84. Euler’s critical load ∝
    A) 1/L² ✔️
    B) L
    C) L²
    D) L³
    Ans: A

85. Stress in a bar due to temperature rise is zero if
    A) Bar is free to expand ✔️
    B) Bar is fixed
    C) Bar is cooled
    D) Bar is loaded
    Ans: A

86. Elastic limit is
    A) Max stress without permanent deformation ✔️
    B) Yield stress
    C) Breaking stress
    D) Ultimate stress
    Ans: A

87. Plastic deformation starts after
    A) Yield point ✔️
    B) Elastic limit
    C) Proportional limit
    D) Breaking point
    Ans: A

88. Working stress is
    A) Ultimate stress / FOS ✔️
    B) Yield stress
    C) Breaking stress
    D) Proof stress
    Ans: A

89. Complementary shear stresses act on
    A) Mutually perpendicular planes ✔️
    B) Parallel planes
    C) Inclined planes
    D) Random planes
    Ans: A

90. Neutral axis shifts when
    A) Section is unsymmetrical ✔️
    B) Section is symmetrical
    C) Load is zero
    D) Moment is zero
    Ans: A

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91. In pure bending, shear force is
    A) Zero ✔️
    B) Maximum
    C) Constant
    D) Negative
    Ans: A

92. Shear center is point where
    A) Load causes no twisting ✔️
    B) Load causes bending only
    C) Load causes shear only
    D) Load causes tension only
    Ans: A

93. Cast iron is best in
    A) Compression ✔️
    B) Tension
    C) Shear
    D) Torsion
    Ans: A

94. Deflection increases if
    A) Span increases ✔️
    B) EI increases
    C) Depth increases
    D) Width increases
    Ans: A

95. Strain is
    A) Dimensionless ✔️
    B) In N
    C) In m
    D) In kg
    Ans: A

96. Stress-strain curve of ductile material shows
    A) Yield plateau ✔️
    B) Sudden break
    C) No plastic zone
    D) No elastic zone
    Ans: A

97. Toughness is area under
    A) Entire stress-strain curve ✔️
    B) Elastic portion only
    C) Plastic portion only
    D) Yield region only
    Ans: A

98. Resilience is area under
    A) Elastic portion of curve ✔️
    B) Plastic portion
    C) Entire curve
    D) Yield portion
    Ans: A

99. Column with both ends fixed has effective length
    A) L/2 ✔️
    B) L
    C) 2L
    D) L/√2
    Ans: A

100. Column with one end fixed and other free has effective length
     A) 2L ✔️
     B) L
     C) L/2
     D) √2L
     Ans: A