Top 150+ Solved Structural Mechanics MCQ Questions Answer
Q. An axial pull of 50 KN is suddenly applied to a steel bar 2 m long and 1000 mm2 in cross-section. If modulus of elasticity is 200 GPa, find strain energy stored in the bar
a. 10,000 N.mm
b. 20,000 N.mm
c. 25,000 N.mm
d. 50,000 N.mm
Q. A 10 m long mild steel rail section is fixed at 300 K temperature. If temperature increases by 60 K, find stress in rail section if ends are not yielded. Coefficient of thermal expansion is 12×10-6/K.
a. 72 N/mm2
b. 144 N/mm2
c. 120 N/mm2
d. 240 N/mm2
Q. Moment of inertia of a square of side 1 unit about an axis through its center of gravity, is .
a. 1
b. 1/12
c. 1/3
d. 1/4
Q. The axis about which moment of area is taken is known as .
a. Axis of area
b. Axis of moment
c. Axis of reference
d. Axis of rotation
Q. What is the formula of theorem of parallel axis?
a. Iab = Ig + ah
b. Iab = ah2 + Ig
c. Iab = Ig – ah2
d. Izz = Iyy + Ixx
Q. What is the formula of theorem of perpendicular axis?
a. Izz = Ixx – Iyy
b. Izz = Ixx + Ah2
c. Izz – Ixx = Iyy
d. None of the above
Q. What is the formula of radius of gyration?
a. k2 = I/A
b. k2 = I2/A
c. k2 = I2/A2
d. k2 = (I/A)1/2
Q. What will be the radius of gyration of a circular plate of diameter 10cm?
a. 1.5cm
b. 2.0cm
c. 2.5cm
d. 3.0cm