81. The distance between the centres of rivets in adjacent rows of zig-zag riveted joint, is called back pitch.
TRUE
FALSE
✅ The correct answer is option B.
Strength of Materials MCQs
82. Within elastic limit, shear stress is __________ shear strain.
equal to
less than
directly proportional to
inversely proportional
✅ The correct answer is option C.
83. The stress developed in the material without any permanent set is called
elastic limit
yield stress
ultimate stress
breaking stress
✅ The correct answer is option A.
84. Two shafts ‘A’ and ‘B’ are made of same material. The shaft ‘A’ is solid and has diameter D. The shaft ‘B’ is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is __________ as that of solid shaft.
Jan-16
1-Aug
1-Apr
15/16
✅ The correct answer is option D.
85. The Poisson’s ratio for cast iron varies from
0.33 to 0.37
0.21 to 0.26
0.31 to 0.34
0.32 to 0.42
✅ The correct answer is option B.
86. The bending moment of a cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is __________ at the fixed end.
wl/2
wl
wl2/2
wl2/6
✅ The correct answer is option D.
87. A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be
same
double
half
one-fourth
✅ The correct answer is option B.
88. In a simple bending theory, one of the assumption is that the plane sections before bending remain plane after bending. This assumption means that
stress is uniform throughout the beam
strain is uniform throughout the beam
stress is proportional to the distance from the neutral axis
strain is proportional
✅ The correct answer is option D.
89. 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.
equal to
less than
more than
✅ The correct answer is option B.
90. When a rectangular beam is loaded transversely, the maximum tensile stress is developed on the
top layer
bottom layer
neutral axis
every cross-section
✅ The correct answer is option A.