Top 1000+ Solved Strength of Materials MCQ Questions Answer
Q. For an isotropic, homogeneous and elastic material, which obeys Hooke's law, the number of independent elastic constants is
a. 1
b. 2
c. 3
d. 6
e. None of the above
Q. A steel wire is hang vertically under its own weight. What is the greatest length it can have if the allowable tensile stress is 2000 kg/cm2 and specific weight of steel is 8000 kg/cm
a. 2500 m
b. 3155 m
c. 1250 m
d. 1750 m
e. 2797 m
Q. If the value of Young's modulus of elasticity is zero, it implies that the material is
a. highly elastic
b. plastic
c. visco-elastic
d. incompressible
e. None of the above
Q. A bar of copper form a composite system, which is heated to a temperature of 45?C. The stress in the copper bar will be
a. tensile stress
b. compressive stress
c. bursting stress
d. sher stress
e. None of the above
Q. A brittle steel rod is heated to 160?C and then suddenly clamped at both ends. It is then allowed to cool and breaks at a temperature of 85?C. If E = 200 GN/m2 and ? = 12 x 10-5 / ?C, the breaking stress of steel is
a. 60 MN / m2
b. 90 MN / m2
c. 180 MN / m2
d. 360 MN / m2
e. None of the above
Q. Castellated beams are used for
a. light construction
b. resisting bending moment only
c. loads not passing through shear centre
d. sections subjected to alternate compressive and shear stresses
e. None of the above
Q. The failure of a material under varying load, after a number of cycles of such load, is known as
a. Brittle failure
b. Fatigue failure
c. Hysteresis failure
d. Impact failure
e. Ductile failure
Q. The yield point in fatique loading as compared to the yield point in static loading is
a. Half
b. There is no comparison between the two
c. Higher
d. Same
e. One fourth
Q. The slenderness rtio of a column is zero when
a. its length is exactly equal to radius of gyration
b. its length is half the radius of gyration
c. total load carried is less than half the dead weight
d. its length is supported on all sides throughout its full length
e. None of the above
Q. A perfect frame has N joints. The number of members should not be less than
a. 2N - 5
b. 2N - 3
c. 2N - 1
d. N - 1
e. 2N - 2
Q. Rupture stress is
a. Breaking stress
b. Highest value of stress
c. Stress at breaking point
d. Proof stress
e. Stress given by dividing the load at the moment of incipient fracture, by the area supporting that load
Q. Which material has highest value of Poisson's ratio
a. Copper
b. Steel
c. Wood
d. Rubber
e. Concrete
Q. The approximate value of allowable stress for carbon steel under static loading (in kg/cm2) is
a. 500 - 1000
b. 4000 - 7500
c. 10,000 - 15,000
d. 15,000 - 20,000
e. 20,000 - 25,000