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Free download in PDF Strength of Materials Multiple Choice 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.
(1)
Which of the following has no unit
[A]
kinematic viscosity
[B]
surface tension
[C]
bulk modulus
[D]
strain
(2)
For steel, the ultimate strength in shear as compared to in tension is nearly
[A]
same
[B]
half
[C]
one-third
[D]
two-third
(3)
During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is
[A]
4 tonnes/cm2
[B]
8 tonnes/cm2
[C]
16 tonnes/cm2
[D]
none of the mentioned
(4)
True stress-strain curve for materials is plotted between
[A]
load/original cross-sectional area and change in length/original length
[B]
load/instantaneous cross-sectional area original area and log.
[C]
load/instantaneous cross-sectional area and change in length/original length
[D]
load/instantaneous area and instantaneous area/original area
Answer: load/instantaneous cross-sectional area original area and log.
(5)
The intensity of stress which causes unit strain is called
[A]
unit stress
[B]
bulk modulus
[C]
modulus of rigidity
[D]
modulus of elasticity
Answer: modulus of elasticity
(6)
Percentage reduction of area in performing tensile test on cast iron may be of the order of
[A]
50%
[B]
25%
[C]
0%
[D]
15%
(7)
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]
None of these
(8)
The impact strength of a material is an index of its
[A]
toughness
[B]
tensile strength
[C]
capability of being cold worked
[D]
hardness
(9)
Tensile strength of a material is obtained by dividing the maximum load during the test by the
[A]
area at the time of fracture
[B]
original cross-sectional area
[C]
minimum area after fracture
[D]
none of the above
Answer: original cross-sectional area
(10)
The ultimate tensile stress of mild steel compared to ultimate compressive stress is
[A]
same
[B]
more
[C]
less
[D]
unpredictable
(11)
If the radius of wire stretched by a load is doubled, then its Young’s modulus will be
[A]
doubled
[B]
halved
[C]
become four times
[D]
remain unaffected
Answer: remain unaffected
(12)
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
Answer: shear stress and shear strain
(13)
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
Answer: increase uniformly first and then increase rapidly
(14)
The materials having same elastic properties in all directions are called
[A]
ideal materials
[B]
uniform materials
[C]
isotropic materials
[D]
paractical materials
Answer: isotropic materials
(15)
It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
[A]
internal resistanpe
[B]
tensile stress
[C]
transverse stress
[D]
compressive stress
(16)
Deformation per unit length in the direction of force is known as
[A]
strain
[B]
lateral strain
[C]
linear strain
[D]
linear stress
(17)
The unit of Young’s modulus is
[A]
kg/cm2
[B]
kg cm2
[C]
mm/mm
[D]
kg
(18)
Young’s modulus is defined as the ratio of
[A]
longitudinal stress and longitudinal strain
[B]
lateral stress and lateral strain
[C]
volumetric stress and volumetric strain
[D]
longitudinal stress and lateral strain.
Answer: longitudinal stress and longitudinal strain
(19)
Hooke’s law holds good up to
[A]
yield point
[B]
limit of proportionality
[C]
breaking point
[D]
elastic limit
Answer: limit of proportionality
(20)
Strain is defined as the ratio of
[A]
change in volume to original volume
[B]
change in length to original length
[C]
change in cross-sectional area to original cross-sectional area
[D]
any one of the above
Answer: any one of the above
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