Strength of Materials Questions And Answers Objective Type

Strength of Materials MCQ

SET-4

81.  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

Answer:  C 

82.  In a beam where shear force changes sign, the bending moment will be

• A. zero
• B. minimum
• C. maximum
• D. infinity

Answer:  C

83. The maximum shear stress of a beam of triangular section occurs above the neutral axis,

• A. Correct
• B. Incorrect

Answer:  A

84. For the beam shown in the below figure, the shear force at A is equal to 

• A. wl/6
• B. wl/3
• C. wl
• D. 2 wl/3

Answer:  B

85. The ductility of a material __________ with the increase in percentage reduction in area of a specimen under tensile test.

• A. increases
• B. decreases
• C. remains same

Answer:  A

86.  The rivets are made from ductile material.

• A. Yes
• B. No

Answer:  A

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

• A. same
• B. double
• C. four times
• D. six times

Answer:  C

88. When a closely-coiled helical spring is subjected to an axial load, it is said to be under

• A. bending
• B. shear
• C. torsion
• D. crushing

Answer:  C

89. When a rectangular beam is loaded transversely, the zero stress is developed on the neutral axis.

• A. True
• B. False

Answer:  A

90 . The given figure shows the Mohr’s circle of stress for two unequal and like principal stresses (σx and σy) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by

• A. OC
• B. OP
• C. OQ
• D. PQ

Answer:  C

91. According to Euler’s column theory, the crippling load for a column of length (l) with one end fixed and the other end free is __________ the crippling load for a similar column hinged at both the ends.

• A. equal to
• B. less than
• C. more than

Answer:  B

92. If percentage reduction in area of a certain specimen made of material ‘A’ under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material ‘B’ is 40%, then

• A. the material A is more ductile than material B
• B. the material B is more ductile than material A
• C. the ductility of material A and B is equal
• D. the material A is brittle and material B is ductile

Answer:  A

93. The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of

• A. one right angled triangle
• B. two right angled triangles
• C. one equilateral triangle
• D. two equilateral triangles

Answer:  B

94. A body is subjected to two normal stresses 20 kN/m2 (tensile) and 10 kN/m2 (compressive) acting perpendicular to each other. The maximum shear stress is

• A. 5 kN/m2
• B. 10 kN/m2
• C. 15 kN/m2
• D. 20 kN/m2

Answer:  C

95. When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at

• A. bottom fibre
• B. top fibre
• C. neutral axis
• D. centre of gravity

Answer:  A

96. In a cantilever beam of length l subjected to a uniformly distributed load of w per unit length, the maximum deflection lies at the fixed end.

• A. Yes
• B. No

Answer:  B

97. A lap joint is always in __________ shear.

• A. single
• B. double

Answer:  A

98. The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.

• A. equal to
• B. half
• C. one-third
• D. two-third

Answer:  C

99. When the shear force diagram is a parabolic curve between two points, it indicates that there is a

• A. point load at the two points
• B. no loading between the two points
• C. uniformly distributed load between the two points
• D. uniformly varying load between the two points

Answer:  D

100. The efficiency of a riveted joint is the ratio of the strength of the joint to the strength of the solid plate.

• A. True
• B. False

Answer:  A