01. The stress at a
point is a
(a) Vector
(b)
Scalar
(c)Tensor
(d)None
02. A ‘strut’
is a member, which is primarily subjected to
(a) Axial
compression
(b) Axial tension
(c) Flexural compression
(d) Flexural tension
03. “Shear Strain”
is defined as
(a) Rate of change
of angle
(b) Change in angle
between two planes
(c) Change in angle
between planes at right angles
(d) Distortion of
fibers
04. The property of
material by which it can be beaten (or) rolled
into plate is called
(a)
Malleability
(b) Plasticity
(c) Ductility
(d)
Elasticity
05. Which of the
following is the nominal stress-strain curve for
mild steel
06. The stress based
on actual area of cross section during tension stage
of a mild steel specimen is called
(a) Nominal stress
(b) Normal stress
(c) True stress
(d)
Yield stress
07. Which of the
following is considered as a true characteristic yield stress for mild steel
(a) Proof stress
(b)
Ultimate stress
(c) Upper yield
point
(d) Lower yield point
08. For mild steel
the lower yield points more significant than
upper yield point because
(a) Strain is more
at this point
(b) It is less than
upper yield point
(c) It is less
affected by shape of the section
(d) None of the
above
09. The “Gauge
length “to be used for conduction a tension generally
function of
(a) Diameter bar
(b)
Length of bar
(c) both (a) &
(b)
(d) None of the above
10. Factor of safety
for a ductile material is the ratio of
(a) Ultimate stress
to yield stress
(b) Ultimate stress
to working stress
(c) Breaking stress
to working stress
(d) Yield stress to
working stress
11. Variation of
strain of a material at constant stress is :
(a) Relaxation
(b)
Creep
(c) Shrinkage
(d)
Hysteresis
12. The ability of
material to absorb a large amount of energy is:
(a) Ductility
(b)
Hardness
(c) Toughness
(d)
Resilience
13. A material which
undergoes no deformation till its yield point is
reached and then it flow at a constant stress is:
(a) Elastic - plastic
(b) Rigid - Plastic
(c) Non - plastic
(d)
Non - plastic
14. For metals which
do not have a well-defined yield point, the
proof stress is determined by drawing a line
parallel to the initial tangent at an offset of m:
(a) 0.2 percent
(b)
0.5 percent
(c) 1.0 percent
(d)
2.0 percent
15. Leuder’s lines
on steel specimen under simple tension test is a
direct indication of yielding of material due to slip
along the plane.
(a) of maximum
principal stress
(b) of maximum shear
stress
(c) of loading
(d) perpendicular to
the direction of loading
16. When a
mild-steel specimen fails in a tension- test, the fracture
looks like
17. As soon as the
external forces causing deformation in a
perfectly elastic body are withdrawn, the
elastic deformation disappears
(a) only partially
(b) completely over
a prolonged period of time
(c) completely and
instantaneously
(d) completely after
an initial period of rest
18. For engineering
materials, Poisson’s ratio lies between
(a) 0 and 1
(b) -1 and +1
(c) -1/2 and + 1/2
(d) 0 and 1/2
19. In a compression
test on mild steel
(a) necking does not
occur
(b) Hooke’s law is
not valid
(c) Hooke’s law is
valid beyond yield point
(d) ultimate stress
is more than failure stress
20. For most brittle
materials generally ultimate strength in compression is much larger than the ultimate strength in
tension because
(a) of flaws such as
microscopic cracks or cavities
(b) compression
failure is due to normal stress and failure in
tension is due to shear stress
(c) yield point does
not occur in compression
(d) of inherent
properties of materials
21. Which of the
following is primarily responsible for toughness of
steel?
(a) Iron
(b) Carbon
(c) Manganese
(d) Phosphorous
22. The modulus of
elasticity of high tensile steel is
(a) smaller than
that of mild steel
(b) equal to that of
mild steel
(c) larger than that
of mild steel
(d) equal to that of
aluminium
23. The
stress-strain curve for an ideally plastic material is
24. One of the
following favors brittle fracture in a ductile material?
(a) Elevated
temperature
(b) Slow rate of
straining
(c) Presence of
notch
(d) Circular cross - section
01. The independent
number of elastic constants for a completely an
isotropic elastic material following Hook’s
law, is ______
02. For non-dilatant
material, the maximum value of Poisson’s ratio
is …….
03. The shear
modulus of most materials with respect to the
module of elasticity is
(a) More than half
(b) Less than half
(c) Equal to half
(d) Unrelated
04. A given material
has Young’s modulus E, modulus of rigidity
and Poisson’s ratio 0.25. The ratio of Young’s
modulus to modulus of rigidity of this
material is _________
05. In an experiment
it is found that the bulk modulus of a
material is equal to its shear modulus. The
Poisson’s ratio is _________
06. The ratio of
Young’s modulus to modulus of rigidity for a material having Poisson’s ratio 0.2 is
(a) 12/5
(b) 5/12
(c)5/14
(d)14/5
07. The material of
a rubber balloon has a Poisson’s ratio of 0.5. If
uniform pressure is applied to blow the balloon,
the volumetric strain of the material will be
(a) 0.50
(b) 0.25
(c) 0.20
(d) zero
08. The relation
between the three elastic constants is
(a) E=3KC / (K+C)
(b) 6KC / (3K+C)
(c) E = 9KC / (3K+C)
(d) E = 3KC / (3K+C)
09. For any
structural material, the value of Poisson’s ratio is
always
(a) greater than 1
(b) between 0.5 and
1.0
(c) between ‘0’ and '0.5'
(d) between ‘0’ and
‘0.05’
10. For structural
steel, the relative magnitudes of three modulii of
elasticity E, C and K is given by
(a) E>C>K
(b) K>C>E
(c) C<K<E
(d)C>E>K
11. The ratio of
bulk modulus to Young’s modulus is about:
(a) Less than half
(b) Less than one
third
(c) More than one
third
(d) No relation at
all
12. In terms of
Poisson’s ratio (y) the ratio of Young’s Modulus (E)
to Shear Modulus(G) of elastic materials is
(a) 2(1 +v)
(b)
2(1-v)
(c) 1/2 (1+v)
(d)
1/2 (l-v)
13. A circular rod
of 10 mm diameter is tested for tension and it was
observed that when tension was 11 kN, the total
extension on a 300 mm length was 0.20 mm.
Young’s modulus is
(a) 210 kN / mm3
(b)
210 kN / mm2
(c) 140.06 kN / mm3
(d) None
14. If the modulus
of rigidity is 80 kN/mm2 and bulk modulus is 140
kN / mm2 Poisson’s ratio is
(a) 0.2
(b) 0.25
(c) 0.26
(d) 0.33
15. Match the
following using the codes given below:
Type of material
A. Concrete
B. Cork
C. Rubber
D.
Isotropic Materials
General value of
Poisson’s ratio
1. 0
2. 0.15
3. 0.25
4. 0.33
5. 0.5
Codes:
A B C D
(a) 2 1 5 4
(b) 2 1 5
3
(c) 3 1 5 4
(d) 3 5 1
4
16. If, for a given
material, E = 2G (E is modulus of elasticity and G is
modulus of rigidity of the material), then the
bulk modulus ‘K’ will be
(a) E / 3
(b) E / 2
(c) E / 4
(d) E
17. Given that for
an element in a body of homogeneous
isotropic material subjected to plane stresses , εx,εy
and εz are normal strains in x, y and z
directions respectively and μ is the Poisson’s ratio, the
magnitude of unit volume charge of the
element is given by
(a) εx + εy + εz
(b) εx-μ (εy + εz)
(c) μ(εx + εy + εz)
(d) (1 /εx ) + (1
/εy + (1 /εz )
18. A steel cube of
volume 8000 cc is subjected to all round stress of
1330 kg/cm2. The bulk modulus of the
material is 1.33 x 106 kg/cm2. The volumetric
change is
(a) 8 cc
(b) 6 cc
(c) 0.8 cc
(d) 10-3 cc
01. A square bar of
certain material with 4 cm side, is subjected to a
pull of 16t, where by the extension is 0.1 cm
in a length of 200 cm. If the Poisson’s ratio is
1/ 4, the rigidity modulus of the material in kg /
cm2
(a) 2 x 106
(b) 1.6
x 106
(c) 1.8 x 106
(d)
0.8 x 106
02. A bar 4 cm in
diameter is subjected to an axial load of 4 t. The
extension of the bar over a gauge length of 20
cm is 0.03 cm. The decrease in diameter is
0.0018 cm. The Poisson’s ratio is
(a) 0.25
(b) 0.30
(c) 0.33
(d) 0.35
03. A steel rod of
circular section tapers from 2 cm diameter to 1 cm
diameter over a length of 50cm. If the modulus
of elasticity of the material is 2 x 106
kg/cm2, then the increase in length under a pull
of 3000 kg will be
(a) 0.3/2 πcm
(b)
30/πcm
(c)300/π
(d) 750 cm
04. A cylindrical
bar of 20 mm diameter and 1 m length is subjected
to a tensile test. Its longitudinal strain
is 4 times that of its lateral
strain. If the modulus of elasticity is 2 x 1
0 N /mm2, then its modulus of rigidity
will be
(a) 8 x 106 N /mm2
(b) 8 x 105 N /mm2
(c) 0.8 x 104 N /mm2
(d) 0.8 x 105N /mm2
05. An short cast
iron column carries a load of 50 t. If the original and Poisson’s ratio
= 0.25, the increase in dia of
column in ‘cm’ would
be
(a) 0.003 18
(b)
0.00256
(c) 0.002
(d)
0.00280
06. A spherical ball
of volume 20m3 is placed under a certain liquid
where in the ball is subjected to a uniform
hydrostatic pressure of 200 MPa. If the material of the
ball has a bulk modulus of elasticity of 2.5 x
105 MPa and a Poisson’s ratio of 0.30, then due to
the hydrostatic pressure, the volume of the ball
will change by
(a) 0.0008 m3
(b)
0.0 144 m3
(c) 0.0160 m3
(d)
0.048 m3
01. A steel rod of 2
cm2 area and 1 m in height is subjected to a pull
of 40,000 N. If Young’s Modulus is 2 x 1 0
N/mm2, the elongation of the rod in mm will be
(a) 10
(b) 100
(c) 1
(d) 0.1
02. A steel rod of
length 1m extends by 1 mm when subjected to an
axial load in N/mm2, the stress developed is
(a) 50
(b) 100
(c)
200
(d) 400
03. The diameter of
a tapering rod varies from ‘D’ to ‘D/2’ in length
of ‘L’ m. If it is subjected
to an axial tension of
‘P’ the change in length is
(a) 4 PL / μ ED2
(b)
8 PL / μ ED2
(c)2 PL/μ ED2
(d) None
04. An elastic bar
of length ‘l’ area of cross section ‘A’ self weight ‘W’
is hanging vertically. It is subjected to an
axial comp.load of ‘W’ units at the bottom end. The
change in length of bar is:
(a) WL / 2 AE
(Extension)
(b) WL / 2 AE
(contraction)
(c) 3 WL / 2 AE
(Extension)
(d) WL / AE
(contraction)
05. The elongation
of the bar due to its own weight is
(a)Wl/2AE
(b)Wl/AE
(c) WI/b2E
(d)2W/AE
06. If all the
dimensions of a vertically suspended circular bar are
doubled, then the maximum stress produced in
it due to its own weight will
(a) become half
(b) remain unaltered
(c) be doubled
(d) be tripled
07. If all the
dimensions of a vertically suspended circular bar are doubled and cross sectional area is made half, then the
maximum change length due to its
own weight will
(a) become half
(b) remain unaltered
(c) be doubled
(d)
be four times
08. A plate of 1 cm
thick and 5 cm wide has a rivet hole of diameter 1
cm as shown in figure. It is subjected to a load
of 1000 N. the maximum tensile stress. In the plate is approximately .........MPa
09. Two bars of same
size but of different materials are subjected to
same tensile force. If the bars have their axial
elongation in the ratio of 4 : 6, then the ratio of
modulus of elasticity of the two materials would
be___
01. The axial
movement of bottom surface of compound bar loaded
as shown below is
(a) 1.5 (PL/AE)
(b) 2.0 (PL/AE) 2A
LE
(e) 2.5 (PL/AE) ‘
(d) 3.0 (PL/AE)
02. ABC is rigid bar. It is hinged at ‘A’ and suspended at ‘B’ and ‘C’ by two wires ‘BD’ arid ‘CE’ made of copper and steel respectively. The bar carries a load of 1 t at ‘F’ midway between ‘B’ and ‘C’.
Given A = 4 cm2 = 2 cm2 E=1x106kg/cm2 Es=2x10 6kg/cm2
The ratio of forces in copper and steel wires is,
(a) 0.5
(b) 4
(c) 0.25
(d) 2
03. The ratio of loads shared by parts ‘AB’ and ‘BC’ of the bar shown below is
(a) 1:1
(b) 2:1
(c) 3:1
(d) 1:2
04. An elastic body
is subjected to a direct compressive stress
‘Px' in longitudinal direction. If the lateral
strains in the other two directions are prevented by
applying ‘Py’ and ‘Pz’ in those
directions, then Py=
Pz is equal to (‘’ Poisson’sratio)
(a) Px / (μ - 1)
(b) μ. Px
(c)Px/ μ(1-
2)
(d)μ . Px/ (1 - μ)
05. A hole to be
punched in a plate of 10 mm thick. The allowable
crushing stress of the punch is 4 times the shearing /
stress of the plate. diameter of the
smallest hole that can be punched in the plate
in ‘mm’ is
(a) 10mm
(b) 20mm
(c) 40 mm
(d) none
06. For the
cantilever beam as shown in Figure the cross-sectional area
of the steel, aluminum and bronze part is 500
mm2, 400 mm2 and 200 mm2 respectively. The
maximum P that will not exceed a stress in steel of 140 MPa, in Aluminum of 90 Mpa or in Bronze of 100
MPa Is
(a) 25000 N
(b) 36030 N
(c) 14000 N
(d) 10000 N
07. Assume that
Young’s modulus of steel is twice that of brass. Two
bars of brass and a bar of steel of equal cross
— section form a single tension member with
the help of rigid pins as shown in the figure.
The shear in the pin will be
(a)0.25P
(b)0.5P
(c)0.33P
(d)0.4P
08. A rigid beam
LI3CD is hinged at D and supported by two
springs at A and B as shown in the figure. The
beam carries a vertical load P at C. The stiffness
of spring at A is 2K and that of B is K. The ratio
of forces of spring at A and that of spring
at B is
(a) 1
(b) 2
(c) 3
(d) 4
01.f a steel tyre is
heated and struck on a rigid wheel, after cooling
the tyre will be subjected to
(a) Normal compression
(b) Normal tension
(c) Hoop compression
(d) Hoop tension
02. A steel bar is
kept between two copper(parallel) bars and rigidly
connected at room temperature together. system
cooled suddenly, the stresses produced in the bars
will be
(a) tension in steel
& compression in copper
(b) compression in
both steel & copper
(c) tension in both
steel & copper
(d) compression m
steel & tension in copper
03. A square plate
(a x a) rigidly held at three edges is free to move
along the fourth edge. If temperature of the
plate is raised by temperature ‘t’, then the free
expansion at the fourth edge
will be (coefficient
of thermal expansion of the material is a ,
modulus of elasticity of the material is E and
its Poisson’s ratio is μ
(a) a α t μ
(b)a α t(1+μ)
(c)a α t + α t μ
(d)a α t(1-μ)
04 A thin steel tyre
of diameter ‘d’ is to be shrunk on to slightly large
wheel of diameter ‘D’ , if E is the modulus of
elasticity of steel, the circumferential
stress developed is
(a) ((D-d) / d ) E
comp
(b) ((D-d) / d) E
tensile
(c) ((D-d) / D) E
comp
(d) ((D-d) / D) E
tensile
05. A composite bar
of steel and copper as shown in fig. i.e., subjected
to Copper rise of temperature, the steel bar will
be under ( αc > αs)
(a) Tension
(b)
Compression
(c) Shear
(d) No
stress
06. A uniform,
slender cylindrical rod is made of a homogeneous and
isotropic material. The rod rests on a
frictionless surface. The rod is heated uniformly. The
radial and longitudinal thermal
stresses are
represented by Gr and az respectively
(a) σr = 0; σz =0
(b)σr = 0; σz ≠ 0
(c) σr ≠ 0; σz = 0
(d)σr ≠ 0; σz ≠ 0
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