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Free download in PDF Strength of Materials Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(23)
If a material expands freely due to heating it will develop
[A]
thermal stresses
[B]
tensile stress
[C]
bending
[D]
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
(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
(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
(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
(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
31
The materials which exhibit the same elastic properties in all directions are called
[A]
homogeneous
[B]
inelastic
[C]
isotropic
[D]
isentropic
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
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
36
Which of the following materials is most elastic
[A]
rubber
[B]
plastic
[C]
brass
[D]
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
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
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