Strength of Materials 100 Questions with Answers
1. If a rigidity connected
composite bar of steel and copper is heated
(copper steel) the copper bar will be subjected to
A. Compression B. Tension
C. Torsion D. None
Answer: Option A
2.
Poisson’s ratio for an elastic incompressible
material is
A. 0.5 B. 0
C.0.29 D. 9.3
Answer: Option A
3. Limit
of proportionality depends
A. Area of cross-section B. Type of loading
C. Type of material D. All of above
Answer: Option C
4. The relationship between young’s modulus of
elasticity E, bulk modulus K and poisons ratio
is given by
A.
E=2k(1-2µ) B. E=3k(1+µ)
C. E=3k(1-2µ)
D. E=2k(1+µ)
Answer: Option C
5. Limiting
values of poission’s ratio are
A. +1 and 0.5
B. -1 and 0.5
C.
1 and -0.5 D. 0 and 0.5
Answer: Option D
6.Poisson’s
ratio for cast iron is
A.0.27 B. 0.31
C.
0.33 D. 0.36
Answer: Option A
7. The units of true strain are
A.cm/cm B. kg/cm
C.kg/cm/cm D. dimensionless
Answer: Option D
8. Lamis theorem states that
A. Three forces acting at a point are always in
equilibrium
B. If three forces acting on a point can be
represented in magnitude and direction by the side of a triangle, the point
will be in equilibrium
C. Three coplanar forces acting at a point will in
equilibrium if each force proportional to the sine of the angle between other.
D. Three forces acting at a point will be in
equilibrium if each force is inversely proportional to the sine of the angle
between other two.
Answer: Option C
9. The property
by which a body returns to its original shape after remove of the force is
called
A.
Plasticity B. elasticity
C. ductility D. malleability
Answer: Option B
10. Every material obeys the Hook’s law with in its
A. Elastic limit B.
Plastic point
C. limit of proportionality D.
ultimate stress
Answer: Option A
11. The units of M.I. are
A. kg/m B. m4
C. m2 D. m3
Answer: Option B
12. At the point of contra flexure in a beam
A.
B.M. is zero B. B.M. change its sign
C.
S.F. zero D. Both S.F and B.M
change sign
Answer: Option B
13. In a double overhang beam carrying U.D.L through out
its length the number of point of contra flexures are
A.1 B. 2
C. 0
D. 3
Answer: Option B
14. The max B.M in a S.S.B carrying a total U.D.L of W kN
over the entire span ‘L’ is
A.WL/4 B. WL/8
C.WL/3 D. WL
Answer: Option B
15. The Max B.M In a cantilever of span ‘L’ carrying a
total U.D.L of W is
A.WL2/2 B. WL/2
C.WL/4 D. WL
Answer: Option B
16. The max B.M In a S.S.B carrying two equal points
‘W’ each acting acting at middle third points is
A.WL/4 B. WL/6
C.
WL/3 D. WL/8
Answer: Option C
17. The relation between S.F and Bending moment at a
section is given by
A.F=dm/dx B. F=d2 M/dx2
C.
F= Mdx D. F=d2 Y/dx2 EI
Answer: Option A
18. A beam is provided with supports not at free end called
A. continuous beam B. over haging beam
C.
fixed beam D.
freely supported beam
Answer: Option B
19. If a cantilever beam subjected to a point load at
free end. The maximum shear force occurs at
A. fixed end B. free end
C.
throughout the total length D. mid span
Answer: Option C
20. Where
the B.M. changes is sign, there the S.F. is
A. Maximum B. Minimum
C. Zero D. None
Answer: Option D
21. Rate of change of shear force is equal to
A. Bending moment B. Intensity of loading
C. Maximum deflection D. Slope
Answer: Option B
22. Rate of change of B.M. is equal to
A.
Shear force B. Intensity of load
C.
Slope D. Deflection
Answer: Option A
23. Change in bending moment between two section is given
by
A.
Area of the S.F.D B. Area of the B.M.D
C.
Area of the loading diagram D. All the above
Answer: Option A
24.
Change in S.F. between two sections given
A.
Area of S.F.D B. Area of B.M.D
C. Area
of loading diagram D. All the above
Answer: Option C
25. Slope
of B.M.D. gives
A.
Shear force B. Bending moment
C Intensity of loading D. Deflection
Answer: Option A
26. A bending moment is defined as
A.
Arithmetic sum of the moments of all the forces on either side of the section
B. Algebraic sum of the forces on either side of the
section
C. Algebraic sum of the forces of all the forces on
the either side of the
Section
D. Algebraic sum of the forces of all the forces on
the either side of the section
Answer: Option A
27. A
simply supported beam of span L carries a concentrated load W at its mid –span.
The max. bending moment m is
A. WL/2 B. WL/4
B. WL/8 D. WL/6
Answer: Option
C
28.
The shape of B.M diagram with U.D.L over a length of a beam is
A.
Linear B. Parabolic
C. Cubical D.
Circular
Answer: Option B
29. For S.S. Beam with
central load, the B.M is
A. Least at center B. Parabolic
C.Max. at center D. Max.at support
Answer: Option B
30. The ratio of width
to depth of a strongest rectangular beams that can be cut out a cylindrical log
of wood
A.1/2 B. 1/
C. 1/3 D. 2/3
Answer:
Option
B
31. A beam of uniform
strength has at every section same
A.
Bending
moment B. Bending stress
C.Deflection D. Stiffness
Answer:
Option
B
32. The curvature of
the beam is equal to
A.EI/M B. ME/I
C. M/EI D. MI/E
Answer:
Option
C
33. M/I= f/Y=E/R This
equation is absolutely correct when B.M is varying
A.
Linear
B. Parabola
C.Constant D. None
Answer: Option B
34. Units for section-
modulus of a beam is
A.mm2 B. N/mm2
C. mm3 D. mm4
Answer: Option C
35. Section modulus of
a beam is maximum at
A. Where the M.I of a section is
minimum
B. Where the M.I of a section is
maximum
C. Where the ‘y’ is maximum
D. None of the above
Answer: Option B
36. At point of contra
flexure
A.S.F.
is zero B. B.M is zero
C. Both S.F & B.M is zero D.
Slope is zero
Answer: Option C
37. Which one of the
correct assumption of the theory of simple bending
A. The value of “ youngs modulus
is same in tension & compression
B. Transverse section of a beam
remains plane before of the bending
C. The material of the beam is homogenous
D. All of the above
Answer:
Option
D
38. Along the neutral
axis of a simply supported beam
A.
Fibres
do not undergo strain B. Fibres undergo
minimum strain
C.Fibres
undergo max. strain D.None
of the above
Answer: Option A
39. A reinforced
concrete beam is assumed to be made of
A. Homogenous material B. Heterogeneous material
C.Isotropic material
D. None of the above
Answer:
Option
B
40. The shear stress in
a beam is zero
A. At the centroid of the section
B. On the extremetree surface fibres
C. At the neutral axis but not at the centroid
D. At the free edges
Answer:
Option
B
41. The shear stress on
a beam section is maximum
A.
At
the centroid of the section
B.
On
the extreme free surface fibres
C.
At
the neutral axis but not at the centroid
D.
At
the free edges
Answer: Option A
42. The maximum shear stress will always
occur at
A. Neutral axis
B.
The
top extreme fiber
C.
The
bottom extreme fiber
D.
A
fiber in the cross section depending on the configuration
Answer: Option B
43. The ratio of the maximum shear stress to
the average shear stress of a rectangular section or rectangular
A. 2 B. 1.5
C.1.75 D. None
Answer: Option B
44. The shear stress
distribution across a rectangle beam section
A. Linear B. Cubic parabola
C.Parabolic D. Hyperbolic
Answer: Option C
45. The variation of
the shear stress on a plane parallel to the neutral plane in a beam caused by a
uniformly distributed load is
A.
Linear B. parabolic
C.Non- Linear D. Linear or non- linear
Answer: Option A
46. Along the principle
plane subjected to maximum principle stress
A.
Max.
shear stress acts B. Min. shear stress
acts
C.No shear stress acts D. None of these
Answer: Option C
47. When a member of
length ‘L’ subjected to a uniform BM ‘M’ the deflection at the centre when it
is bent into a circular are will be
A.ML2/2EI B.
ML2/4EI
C.ML2/8EI D. ML2/EI
Answer:
Option
C
48. A cantilever beam
of length ‘L’ is subjected to a UDL of ‘w’ M, the maximum deflection will be
A.WL4/8EI B.
wL4/4EI
C.wL4/48EZ D. 5/284 wL4/8EI
Answer:
Option
A
49. The differential
equation for the deflected beam is
A.
EId2y/ B.
Bending moment
C Intencity of loading D.
Deflection
Answer: Option A
50. Rate of change of
deflection is called
A.
Slope B.
Shear force
C.Slope D. Deflection
Answer:
Option
A
51. Rate of change of slope is called
A.
Intensity of load B.
Shear force
C. Deflection D.
Shear force
Answer:
Option
B
52. Radius of curvature
of the beam is equal to
A.M/EI B.
WI2/2
C. EI/M D. M/Z
Answer:
Option
C
53. A simply supported beam of span ‘I’ meters
is carrying a u.d.l of wKN/meter run over the entre span. The slope at the left
support is given by
A.wl2/16El B.
Bending moment
C Intencity of loading D.
Deflection
Answer:
Option
C
54. The max deflection
of a S.S.B of length L with central load W is
A.WL2/48El B. W2 L/48El
C. WL3/48El D. w3L/48El
Answer:
Option
C
55. Max. deflection of
a cantilever due to pure bending moments M at its free end is
A.ML2/3El B.
ML2/4El
C. ML2/6El D. ML2/2El
Answer:
Option
D
56. The moment diagram
for a cantilever whose free end is subjected to a B.M. will be
A.
Triangle B.
Rectangle
C.Parasole D.
Cubic Parasole
Answer:
Option
B
57. If a fixed beam is
subjected to point load at mid span, total number of points of contraflexure
are
A.
1 B.
2
C.3 D. Zero
Answer:
Option
B
58. In a fixed beam, if
a support sink by then the fixed end
moment due to the sinking is equal to
A. Shear force B.
Bending moment
C Intencity of loading D.
None
Answer:
Option
B
59. For the same
loading, the maximum deflection for a fixed beam, when compared to the simply
supported
A.
Equal B.
More
C.less D. None
Answer:
Option
C
60. A hollow shaft
transmit – power than a solid shaft of same material and same weight
A. Less B.
Same
C. More D.
None
Answer:
Option
C
61. The ratio of max
shear stress developed in a solid shaft of dia ‘D’ and a hollow shaft of
external dia ‘D’ and internal dia ‘d’ for the same Torque is given by
A. D2+d2/D2 B. D2-d4 /D4
C.D 2-d2/D2 D.
D4-d4/d4
Answer:
Option
B
62. If shaft of
diameter ‘d’ is subjected to a Torque “T” the max shear stress is
A.32T/πd3 B.
16T/ πd3
C. 16T/ πd2 D. 64T/ πd4
Answer:
Option
B
63. Torsional Rigidity
is
A. The Torque that produces rotation
of unit R.P.M in the shaft
B. The
torque that transmit unit H.P at one r.p.m.
C. The
torque which produces a twist of unit radian in unit length
D. The
torque which produces a unit twist in a unit dia
Answer:
Option
C
64. If a shaft
subjected to torsion the max shear stress occur at
A. Center B.
Outer most surface
C. Between the center and outer most fibre D.
2/3 radius
Answer:
Option
B
65. Torsion equation is
applicable for the cross section
A. Rectangular only B. Circular section only
C. All section D. Circular and tubular section only
Answer:
Option
D
66. Polar moment of
Inertia is
A. M.I about Z axis of the member
B. M.I
about ‘x’ axis of the member
C. M.I
about ‘y’ axis of the member
D. M.I
about x.y axis
Answer:
Option
A
67. A vessel is said to
be thin walled, when
A.
The vessel is made of thin sheets
B.
The vessel wall thickness is less than 1 mm
C.
The vessel wall thickness is equal to or less than 1/20
of the internal diameter of the vessel
D.
The vessel wall thickness is equal to or less than 1/10
of the internal diameter of the above
Answer:
Option
C
68. The ratio of hoop
stress to longitudinal stress for thin spherical shell is
A. 2 B. 1/2
C. 0 D. 1/4
E. There is no such ratio for
spherical shells
Answer:
Option
C
69. Hoop stress is
A.
Circumferential tensile stress
B.
Compressive stress
C.
Radial stress
D.
Longitudinal stress
E.
None of the a bove
Answer:
Option
A
70. In case of thin
walled cylinders the ratio of hoop stress to longitudinal stress is
A. 2 B. 1/4
C.4 D. 1/2
Answer:
Option
A
71. If the
cylinders is subjected to internal
pressure, then the hoop stress is in nature
A. Compressive B. Tensile
C. Shear D.
Bending
Answer:
Option
B
72. If the cylinder is
subjected to external water pressure, then the hoop stress is in nature
A. Compressive B. Tensile
C. Shear D. Bending
Answer:
Option
A
73. The maximum shear
stress developed in a thin cylinder is equal to
A. pd/2t B. pd/4t
C.pd/8t D. None
Answer:
Option
C
74. Euler’s theory not
valid for mild steel structure. If the slenderness ratio
A. more than 80 B. Less than 80
C. More than 120 D. In between 80-120
Answer:
Option
B
75. Column will be
having maximum bucking load, if its
A. Both ends are fixed B.
One end fixed and other end hinged
C. Both ends are hinged D. One end fixed and the other end is
free
Answer:
Option
A
76. Strut is a
compression member used in
A.
Building frames B.
Trusses
B. Cranes D. Retaining
walls
Answer:
Option
B
77. Short columns fail
due to
A. Crushing B.
Bending
C. Tension D. Buckling
Answer:
Option
A
78. The load at which
the member just buckles is called
A. Buckling load B. critical load
C. Crippling load D. All of the above
Answer:
Option
D
79. Euler’s formula is
applicable for
A. Long columns only B. Short columns only
C. Both long and short columns D. None
Answer:
Option
C
80. When the
slenderness ratio of the column is increased then the value of crippling load
is
A. Low B. High
C. Zero D. None
Answer:
Option
A
81. The slenderness
limit for using the Euler’s formula is
A. 12 B.
24
C.50 D. 80
Answer:
Option
D
82. Rankine’s load is
equal to
A. P=(pc+pe /pc pe
) B. P=(pcpe/pc+pe)
C. P=(pc+pe/pc-pe) D. P=(pc-pe/pc+pe)
Answer:
Option
B
83. The Rankine’s
constant is given by
A. α =fc/π2E B. α = fcE/π2
C. α =π2EI/l2 D.
α =π2E/l2
Answer:
Option
A
84. Rankine’s constant
for the mild steel is
A. 1/9000 B. 1/1600
C. 1/7500 D. 1/750
Answer:
Option
C
85. Stanchion’s are
used in
A. Trusses B.
Cranes
C. Buildings D. None
Answer:
Option
C
86. The ratio between
effective length of the and leas radius of gyration is called as
A. Section modulus B. Buckling point
C. Slenderness Ration D. None of the above
Answer:
Option
C
87. The earth retained
by retaining wall called
A. Surcharge B. Angle of repose
C. Back fill D. None
Answer:
Option
C
88. Co-efficient of
active earth pressure is given by
A. 1-sinǿ/1+sin B. 1+sin /1-sin
C. 1-sin /1+sin D.
None
Answer:
Option
A
89. Co-efficient of
passive earth pressure is given by
A.32T/πd3 B.
16T/ πd3
C. 16T/ πd2 D. 64T/ πd4
Answer:
Option
B
90. For cohesive soils,
angle of internal friction is
A.300 B.
450
C.900 D.
00
Answer:
Option
D
91. For sand, angle of
internal friction is
A.300 B.
450
C.900 D. 00
Answer:
Option
A
92. The factor of
safety for sliding is
A. 1.5 B. 3
C. 4 D. 2.5
Answer:
Option
A
93. The factor of
safety for over turning is
A. 1.5 B.
2
C. 2.5
D. 3
Answer:
Option
B
94. The resistance of
dam against sliding increases with increases of
A.
Depth of water
B.
Weight of the dam
C.
Weight of water on the dam
D.
Stabilizing moment
Answer:
Option
B
95. If no tension to
occur at the base the resultant force on the dam should strike the base
A.
At the heel if the dam
B.
At the toe of the dam
C.
Beyond the base width of the dam
D.
With in the middle third of the base
Answer:
Option
D
96. The dam fails by
over turning if the resultant force strike the base at
A.
Middle if the base
B.
2/3 the base width
C.
Beyond the base
D.
A distance equal to top width from the face of the dam
Answer:
Option
C
97. Tension occurs at
the base of the dam if the eccentricity is
A. e>b/6 B.
e<b/6
C. e=-b/6 D. e=0
Answer:
Option
A
98. A diagram which
represents the variation of axial load along the length of simply supported
beam
A. Bending Moment diagram B. Shear Force diagram
C. Thrust diagram D.
Both A and B are correct
Answer:
Option
C
99. The practical unit
of work is
A. Joule B.
Erg
C. Newton D. Dyne
Answer:
Option
A
100. Mechanical
advantage is equal to
A. Load/effort B. Input x output
C. Efficiency x velocity ratio D. Efficiency /
velocity ratio
Answer:
Option
A
I have read a few good stuff here. Definitely worth bookmarking for revisiting. I wonder how much effort you put to make such a wonderful informative site.Alexandr Shcolyar
ReplyDelete