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Mechanical Engineering Objective Questions { Strength of Materials }



8. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
A.Uniform throughout
B.Increase uniformly
C.First increase and then decrease
D.Increase uniformly first and then increase rapidly

9. Modulus of rigidity is defined as the ratio of
A.Longitudinal stress and longitudinal strain
B.Volumetric stress and volumetric strain
C.Lateral stress and lateral strain
D.Shear stress and shear strain

10. If the radius of wire stretched by a load is doubled, then its Young's modulus will be
A.Doubled
B.Remain unaffected.
C.Become four times
D.Become one-fourth

11. The ultimate tensile stress of mild steel compared to ultimate compressive stress is
A.Same
B.More
C.Less
D.More or less depending on other factors

12. The impact strength of a material is an index of its
A.Toughness
B.Tensile strength
C.Capability of being cold worked
D.Hardness

13. The Young's modulus of a wire is defined as the stress which will increase the length of wire compared to its original length
A.Half
B.Same amount
C.Double
D.One-fourth

14. Percentage reduction of area in performing tensile test on cast iron may be of the order. of
A.0.5
B.0.25
C.0
D.0.15

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