Top 1000+ Solved Strength of Materials MCQ Questions Answer
Q. A mild steel flat 3 m long 150 mm wide and 15 mm thick carries an axial tensile load of 150 kN. If the value of u for mild steel is 0.3, it can be concluded that
a. length, width and thickness all will elongate
b. length and width will increase but thickness will decrease
c. length and thickness will increase but width will ecrease
d. length will increase but width and thickness will decrease
e. None of the above
Q. A cantilever beam rectangular in cross-section is subjected to a load W at its free end, causing deflection ?1. If the load is increased to 2W, causing deflwction ?2, the value of ?1/?1 would be
b. 22
c. 4
d. Stress is proportional to strain at all section
e. 1
Q. In a tensile test conducted on a ductile material, the ratio of the true stress to the engineering stress, is approximately
a. 0.2
b. 1.05
c. 0.9
d. 10
e. None of the above
Q. In case of a circular shaft subjected to torque the value of shear stress
a. Has maximum value at the axis
b. Varies linearly from axis to surface
c. Has maximum value at the surface
d. Is uniform throughout
e. Is zero at the axis and linearly increases to a maximum value at the surface of the shaft
Q. Temperature stresses are set up in a material when
a. it is free to expand or contract
b. it is first heated and then cooled
c. it is first colled and then heated
d. its expansion or contraction is restrained
e. None of the above
Q. The effective length of a column effectively held in position and restrained in direction at both ends will be
a. 2L
b. 0.67 L
c. L
d. 1.5 L
e. 0.85 L
Q. The average values of modulus of rigidity for Aluminium. Brass Copper, Nickel and Steel in desceading order are given by
a. Aluminium, Nickle, Steel, Brass, Copper
b. Steel, Nickle, Copper, Brass, Aluminium
c. Aluminium, Brass, Copper, Nickel, Steel
d. Aluminium, Copper, Nickel, Brass, Steel
e. Brass, Copper, Aluminium, Nickel, Steel
Q. For punching a hole of 25 mm diameter in a plate 20 mm thick, if the shear stress of plate material is 30 kg/mm2, the force required would be
a. 10,000 kg
b. 18,850 kg
c. 28,850 kg
d. 47,123 kg
e. None of the above
Q. A column that fails primarily due to direct stress is called
a. Long column
b. Weak column
c. Short column
d. Medium column
e. None of the above
Q. If D is the diameter of the sphere, then volumetric strain is equal to
a. two times the strain of diameter
b. 1.5 times the strain of diameter
c. three times the strain of diameter
d. the strain of diameter
Q. If L be the length and D be the diameter of cylindrical rod, then volumetric strain of the rod is equal to
a. strain of length plus strain of diameter
b. strain of diameter
c. strain of length plus twice the strain of diameter
d. strain of length
Q. the extension per unit length of the rod due to suddenly applied load as compare to same load gradually applied to same rod is
a. same
b. double
c. three times
d. half
Q. If a bar of length L m extends by l mm under load W, the strain is
a. 1000 l/l
b. l/l
c. 0.001 l/l
d. none of the above