Strength of Materials Quiz | Strength of Materials Objective Type Questions and Answers

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Questions
21 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

Answer: considerably greater than that necessary to continue it
22 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

Answer: tensile strain increases more quickly
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23 If a material expands freely due to heating it will develop
A thermal stresses
B tensile stress
C bending
D no stress

Answer: no stress
24 The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
A more than 50%
B 25—50%
C 25—50%
D negligible

Answer: negligible
25 The change in the unit volume of a material under tension with increase in its Poisson’s ratio will ,
A increase
B decrease
C remain same
D increase initially and then decrease

Answer: decrease
26 The property of a material by virtue of which it can be beaten or rolled into plates is called
A malleability
B ductility
C plasticity
D elasticity

Answer: malleability
27 For which material the Poisson’s ratio is more than unity
A steel
B copper
C aluminium
D none of the above

Answer: none of the above
28 Poisson’s ratio is defined as the ratio of
A longitudinal stress and longitudinal strain
B longitudinal stress and lateral stress
C lateral stress and longitudinal stress
D lateral stress and lateral strain

Answer: lateral stress and longitudinal stress
29 The property of a material which allows it to be drawn into a smaller section is called
A plasticity
B ductility
C elasticity
D malleability

Answer: ductility
30 The value of Poisson’s ratio for cast iron is
A 0.1 to 0.2
B 0.23 to 0.27
C 0.25 to 0.33
D 0.4 to 0.6

Answer: 0.23 to 0.27
31 The materials which exhibit the same elastic properties in all directions are called
A homogeneous
B inelastic
C isotropic
D isentropic

Answer: isotropic
32 The property of a material by virtue of which a body returns to its original, shape after removal of the load is called
A plasticity
B elasticity
C ductility
D malleability

Answer: elasticity
33 The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
A of same magnitude as that of bar and applied at the lower end
B half the weight of bar applied at lower end
C half of the square of weight of bar applied at lower end
D one-fourth of weight of bar applied at lower end

Answer: half the weight of bar applied at lower end
34 The buckling load for a given material depends on
A slenderness ratio and area of cross-section
B Poisson’s ratio and modulus of elasticity
C slenderness ratio and modulus of elasticity
D slenderness ratio, area of cross-section and modulus of elasticity

Answer: slenderness ratio, area of cross-section and modulus of elasticity
35 The value of Poisson’s ratio for steel is between
A 0.01 to 0.1
B 0.23 to 0.27
C 0.25 to 0.33
D 0.4 to 0.6

Answer: 0.25 to 0.33
36 Which of the following materials is most elastic
A rubber
B plastic
C brass
D steel

Answer: steel
37 If a part is constrained to move and heated, it will develop
A principal stress
B tensile stress
C compressive stress
D shear stress

Answer: compressive stress
38 In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is
A more
B less
C same
D may have any value

Answer: less
39 Which is the false statement about true stress-strain method
A It does not exist
B It is more sensitive to changes in both metallurgical and mechanical conditions
C It gives, a more accurate picture of the ductility
D It can be used for compression tests as well

Answer: It does not exist
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

Answer: creeping

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