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Mechanical Engineering Objective Questions { Strength of Materials }



36. The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
A.More than 50%
B.Negligible.
C.10-25%
D.5-10%

37. If a material expands freely due to heating it will develop
A.Thermal stresses
B.No stress.
C.Bending
D.Compressive stress -

38. In a tensile test, near the elastic limit zone, the
A.Tensile strain increases more quickly
B.Tensile strain decreases more quickly
C.Tensile strain increases in proportion to the stress
D.Tensile strain decreases in proportion to the stress

39. The stress necessary to initiate yielding is
A.Considerably greater than that necessary to continue it
B.Considerably lesser than that necessary to continue it
C.Greater than that necessary to stop it
D.Lesser than that necessary to stop it

40. In the tensile test, the phenomenon of slow extension of the material, i.e. stress increasing with the time at a constant load is called
A.Creeping
B.Yielding
C.Breaking
D.Plasticity

41. The stress developed in a material at breaking point in extension is called
A.Breaking stress
B.Fracture stress
C.Yield point stress
D.Ultimate tensile stress

42. Rupture stress is
A.Breaking stress
B.Maximum load/original cross-sectional area
C.Load at breaking point/A
D.Load at breaking point/neck area

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