CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY
Question Bank
2 MARK ---QUESTION
3 MARK --- QUESTION
4/5 MARK ----QUESTION
COURSE : DPT/ DPMT
SEMESTER: 3rd semester
SUBJECT : Applied Mechanics And Strength Of Materials
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UNIT I FORCES – EQUILIBRIUM
1) When body is in motion,
________ always changes.
a. its velocity b. its acceleration c. its position vector d. its momentum
2) A body is moving with
uniform velocity. Its __________________
a. speed changes b. acceleration changes
c.direction of motion changes d. displacement from origin changes
3) Inertia of an object is
quantitative measure of its __________________
a. volume b. density c. mass d. temperature
4) The dimension of force is
_________________
a. MLT-2
b. ML2T-2
c. ML2T2
d. ML-2T2
5) Rectangular coordinate
system is also called________________
a. polar coordinate system b. Cartesian coordinate system
c. cylindrical coordinate
system d. spherical
coordinate system
6) The direction of a vector
in space is specified by______________
a. one angle b. two angle c. three angle d. no angle
7) The resultant of two
forces of equal magnitudes is also equal to the magnitude of the forces.
The angle between the two
forces is _____ deg.
a. 30 b. 60 c. 90 d. 120
8) The direction of vector
product (Torque) is given by_______________
a. head to tail rule b. right hand rule c . left hand rule d. triangular rule
9) Torque is defined
as_____________
a. turning effect of force b. cross product of position vector and
force
c. product of force and
moment arm d. all a, b
and c are correct
10) The dimension of torque
is____________
a. [ML2T-2] b. [MLT-2] c.
[ML2T] d. [ML-2T-2]
11) SI unit of torque
is___________
a. N.m b. joule c. both a and b are correct d. neither a nor b is correct
12) Torque acting on a body
determines________
a. acceleration b. linear
acceleration c. angular acceleration d. direction of motion of
body
13) A body in
equilibrium_______________
a. always at rest b. always in uniform motion
c. may be at rest or in
uniform motion d. may be at rest or in motion
14) A live load is one
that___________
a. remains constant b. Varies continuously
c. has lived and is no more
in existence d. varies with
time
15) A body will be in
complete equilibrium when it is satisfying___________
a. Ist condition of
equilibrium b. 2nd condition of equilibrium
c. both Ist and 2nd
condition of equilibrium d.
impossible
16) Which one is not a type
of dynamic equilibrium?
a. rotational equilibrium b. translational equilibrium
c. static equilibrium d. both a and c are correct answer
17) Three coplanar forces
acting on a body keep it in equilibrium. They should therefore be
_________
a. concurrent b. non concurrent c. parallel d. non parallel
18) Which of the following
pairs does not have identical dimensions?
a. torque and energy b. momentum and impulse
c. energy and work d. mass and moment of inertia
19) A central force is that
which____________
a. can produce torque b. cannot produce torque
c. some time can produce
torque some time cannot d.
has no relation with torque
20) It is easier to turn a
steering wheel with both hands than with a single hand because________
a. accelerating force
increases on the wheel b.
two forces act on the wheel
c. two hands provide firm
grip d. couple acts on the wheel
21) Two forces of 6 and 8 kg
act at right angles to each other, the resultant force will
be_________
a. 10 b. 28
c. 41 d. 14
22) The forces which meet at
one point but their lines of action do not lie in one plane, are
called___________
a. coplanar concurrent
forces b. coplanar
noncurrent forces
c. non-coplanar concurrent
forces d. intersecting forces
23) A number of forces
acting at a point will be in equilibrium if_______
a. sum of the forces is zero
b. algebraic sum of the
forces is zero
c. sum of the resolved parts
in any two perpendicular directions are both zero
d. none of the above
24) A spherical ball is
resting on a flat surface is said to be in _________ equilibrium.
a) Stable b) Harmonic c) Neutral d) Unstable
Fill in the blanks- (Answer
in bracket)
25) ______ is something
which changes or tend to change the state of rest or of uniform motion
of a body in a straight
line.Centre of Gravity
26) Which of the following
laminas do not have centroid at its geometrical centre?
a. Circle b. Equilateral triangle c. Right angled triangle d. None of the above
27) If a material has no
uniform density throughout the body, then the position of centroid and
center of mass are ________
a. identical b. not identical c . independent upon the density d. unpredictable
28) What is the centroidal
distance along the line of symmetry XO for the quarter circle shown
below? (where D= 4r/3Ï€)
a. √(1/D) b. √D c. √2 (D) d. √2 (D2)
29) What is the angle made
by side of a square lamina, if it is freely suspended from a corner with
the horizontal?
a. 0o
b. 45o
c. 90o
d. 180o
30) What is the C.G of an
isosceles triangle of base 20 cm and side 40?
a. 12.90 cm b. 13.28 cm c. 19.36 cm d. 38.72 cm
31) What is the centroidal
distance of an equilateral triangle of side 2 m?
a. 0.866 m b. 0.769 m c. 1.000 m d. 0.577 m
32) Which method is used to
determine centroid of a composite figure?
a. Analytical method b. Graphical method c. Both a. and b. d. None of the above
Moment of Inertia
33) The Moment of Inertia of
a circular section of diameter (d/2) is given by ______
a. d4 p/32 b. d4 p/64 c.d 4 p/512 d. d 4 /1024
34) What is the moment of
inertia acting on a rectangle of width 15 mm and depth 40 mm about
base by using theorem of
parallel axes?
a. 320 x 103 mm4
b. 300 x 103 mm4 c. 240 x 103 mm4 d. 80 x 103 mm4
35) What is the moment of
inertia acting on a circle of diameter 50 mm?
a. 122.71 x 103 mm4 b. 306.79 x 103 mm4
c. 567.23 x 103 mm4
d. 800 x 103 mm4
36) Which of the following
relations is used to represent theorem of perpendicular axes? (H =
Vertical axis, I = Moment of
inertia and K = Radius of gyration)
a. IPQ = Ixx + AH2
b. IPQ = Ixx + Ak2
c. Izz = Ixx + Iyy d. Izz +
Ixx + Iyy = 0
37) What is the moment of
inertia acting on a semicircle of radius 20 mm about the asymmetrical
axes?
a. 125.663 x 103 mm4
b. 17600 mm4
c. 1500 mm4
d. 8800 mm4
38) The moment of inertia of
an area is always least with respect to __________
a. Bottom most axis b. Radius of gyration c. Central axis d. Vertical axis
UNIT II FRICTION
39) The force of friction
acts in a direction _____ to the direction of motion of object.
a.Same b. Opposite c. Perpendicular d. Downwards
40) The force of friction depends
upon______________
a. Nature of surface of
contact b. Material of objects in contact
c. Both ‘a’ and ‘b’ d. None of the above
41) The body will move only
when___________
a. Force of friction =
applied force b. Force of friction < applied force
c. Force of friction >
applied force d . All of the above
42) The ratio of the
limiting force of friction (F) to the normal reaction (R) is known as_________
a. Coefficient of friction b. Force of friction c. Angle of friction d. None
of the above
43) The coefficient of
friction (µ) is equal to ____
a. TanΦ b. SinΦ c. CotΦ d. CosΦ
Where Φ = angle of friction
44) The force of friction
(F) is equal to_________
a.µR/2 b. µR c. 2µR d. µR/3
45) The value of Normal reaction (R) for the following figure is
If W = Weight of block, P = Applied force, µ = Coefficient of
friction, θ = Angle__________
a. W – PSinθ b. W + PSinθ c. P – WSinθ d. P + WSinθ
46) When the two surfaces in
contact have a thick layer of lubricant in between them, it is known
as_________
a. Solid friction b.Rolling friction c. Greasy friction d. Film friction
47) When two surfaces in
contact have a very thin layer of lubricant in between them, it is known
as__________
a. Solid friction b.Rolling friction c. Greasy friction d. Film friction
48) The force of friction is
maximum when the surface_________
a. Is on the point of motion b. Is at rest c.Is moving d. The friction remains same at all points
49) A man wishes to move a
block of size 3 m x 3 m weighing 80 kg. The coefficient of friction
between the block and the
ground is 0.27. Which of the following methods should be used?
a. Slide along the ground by
pushing b. Pull it c. Lift it bodily d. Tip it over
SIMPLE LIFTING MACHINE
50) The types of threads
used in Screw jacks are__________
a. Metric thread b. Square c. ACME d. Buttress
51) For a single started
thread, the lead is equal to ____ Where p = pitch
a. p/2 b. p c. 2p d. p/3
52) The slope of the thread
with horizontal is known as____________
a. helix b. lead c. pitch d. helix
angle
53) In rotation of shaft,
the power lost in friction is given by____________
If W=Weight of shaft, µ=Coefficient of friction, V= Velocity of shaft (in m/s)
a.W x µ x V Watts b.
W x µ x V Kilo-watts c. W x
µ / V Watts d. W x µ / V Kilowatts
54) If the mechanical advantage of a simple machine is 4, then
the____________
a.output force is 4 times the effort
b.effort is 4 times the output force
c.efficiency is 4%
d.the work output is 4 times the input
55) A pulley system has 3 sections of ropes that lift the load. The
mechanical advantage of the
system is_________
a. 0 b. 1 c. 2 d. 3.
56) The efficiency of a simple machine_________
a. is always less than 100% b. is equal to 100%
c. is always 50% d. is always more than
100%
57) In actual machines____________
a. Mechanical advantage is equal to velocity ratio
b. Mechanical advantage is greater than velocity ratio
c. Mechanical advantage is less than velocity ratio
d. Mechanical advantage is unity
58) Which is not a type of simple machine?
a. spring b. screw c. pulley d. wedge
59) Work is_____________
a. energy from the sun b. a force that moves an object
c. a type of machine
d. a force that pulls you towards
the Earth
60) In a lifting machine, an effort of 500 N is to be moved by a
distance of 20 m to raise a load of
10,000 N by a distance of 0.8 m. Determine the velocity ratio and
mechanical advantage.
a. 10 and 35 b. 20 and 35 c. 10 and 25 d. 25 and 20
61) In a lifting machine, an effort of 500 N is to be moved by a
distance of 20 m to raise a load of
10,000 N by a distance of 0.8 m. Determine the effort lost in
friction___________
a. 100 N b. 10 N c. 278 N d.136 N
62) Velocity ratio of simple wheel and axle is (Where D=Wheel dia.,
d=axle dia., drw= wheel rope
dia, dra= axle rope dia.)_____________
a. d+drw/ D+dra b.
D+drw / d+dra c.
D+dra/ d+drw d. None
of them
63) Velocity ratio of third system of pulley is (Where n = no. of
pulley incl. fixed
pulley)__________
a. 2n-1 b. 2n
c. n d. None of
them
64) Velocity ratio of first system of pulley is (Where n = no. of
moveable pulley)___________
a. 2n-1 b. 2n
c. n d. None of them
UNIT III SIMPLE STRESS & STRAIN
65) Strain is___________
a.The change in metals
b.The change in shape and direction in metal
c.The result of load application on a body
d.The change of form produced in a piece by the action of load
66) A dead load is___________
a. One that does not exist b. One that is dead
c. One that does not move d. One that remains constant..
67) Tensile stress is____________
a.Stress due to any force
b.Stress due to change in length under a load
c.Stress measured by the ratio of the increase or decrease in length
of the unloaded piece
d.Stress measured by the ratio of the change in length of the unloaded
piece under tensile
force
68) Poisson's ratio for cast iron is_____________
a. 0.27 b. 0.31 c. 0.33 d. 0.36
69) A material which recovers fully after unloading but not
instantaneously is known
as____________
a. Plastic b. Elastic c. Partially elastic d. Anelastic
70) The numerical values of Young's modulus of elasticity in
descending order for wood, lead,
glass, steel is given by______________
a. Steel, Glass, Lead and Wood b. Steel, Wood, Glass, Lead
c. Steel, Wood, Lead, Glass d. Steel, Lead, Wood, Glass
71) The materials which exhibit the same elastic properties in all
directions are called____________
a. Homogeneous b.
Isotropic c. Isentropic d. Inelastic
72) The ratio of Bulk modulus to shear modulus for Poisson's ratio of
0.25 will be____________
a. 3 / 2 b. 5/6 c. 1 d. 5/3
73) The stress strain curve for a glass rod during tensile test would
exhibit_______________
a. A straight line b. A parabola c. A sudden break d. An irregular curve
74) Clad metals are_______________
a. Non-ferrous materials
b. Two or more dissimilar materials riveted together
c. Two or more dissimilar materials joined together by welding
d. Two or more dissimilar materials jointed together under very high
hydraulic pressure
75) When a strip made of iron and copper is heated___________________
a. It bends b. It
gets twisted
c. Iron bends on convex side d. Iron bends o n concave
side
76) When the deformation arising from change of temperature is
presented, the stresses set up
are known as________________
a. Compressive stresses
b. Thermal stresses
c. Shear stresses d. Tensile stresses
77) The potential energy stored up in a deformed body is known
as________________
a. Strain energy b.
Potential energy
c. Resilience d.
Deformation energy
78) Two rods A and B are subjected to equal load P. Rod A is tapering
with bigger diameter D at
the support and small end diameter as D/2. Rod B is of uniform cross
section with diameter D.
The ratio of elongation of rod A to that of B would be________________
a. 4 b. 2 c. 1 d. 6
79) The modulus of rigidity is defined as_____________________
a.The ratio of true stress to true strain
b.The ratio of shear stress to shear strain
c.The ratio of longitudinal stress to longitudinal strain
d.The ratio of twisting moment to cross-sectional area
80) Rupture stress is__________________
a.Proof stress
b.Breaking stress
c.Highest value of stress
d.Stress given by dividing the load at the moment of incipient
fracture, by the area supporting
that load
81) The approximate value of allowable stress for carbon steel under
static loading (in kg/cm2)
is____________
a. 500 – 1000 b.
4000 – 7500 c. 10,000 -
15,000 d.15,000 -
20,000
82) Strain is the ratio of ____________________________.
a. Change in length x original length b. Original length / change in
length
c. Change in length / original length d. Original length x change in
length
83) The ratio of stress and strain is known as _____
a. Modulus of elasticity b. Young's modulus c. Both a and b d. None of
the above
84) Two parallel, equal and opposite forces acting tangentially to the
surface of the body is called
as __
a. Complementary stress
b. Compressive stress c. Shear stress d. Tensile stress
85) A rigid body has Poisson's ratio equal to _____
a. 0 b. 1 c. less than 1 d. greater than one
86) The thermal stress induced in a steel rod is compressive, if
temperature _____
a. decreases b.
increases c. remains constant d. none of the above
87) The deformation of a material caused due temperature variation
develops ___
a. stress b. strain c. both a. and b. d. none of the above
UNIT IV SHEAR FORCE & BENDING MOMENT
88) For a beam of uniform strength if its depth is maintained
constant, then its width will vary in
proportion to_______________
a. Bending Moment, BM b. (BM)2
c. 2(BM) d.
(BM)3
89) A beam of uniform strength is one in which_____________
a. The cross-section is same throughout
b. The bending moment is same at every section
c. The stiffness is same at every section
d. The bending stress is same at every section
90) The bending moment diagram for a cantilever beam subjected to
bending moment at the
end of the beam would be_____________
a. Rectangle b. Triangle c. Parabola d. Cubic parabola
91) If shear force is zero along a section, the bending moment at that
section will
be__________________
a. Zero b.
Minimum c. Maximum d. Minimum or Maximum
92) A continuous beam is_________________
a. One which is constrained at both ends
b. One resting upon several supports
c. One which is part of a system consisting of a number of beams
d. One which is very long as compared to width of beam
93) A beam simply supported at ends is subjected to load. The point of
contra flexure is located where
a. Shear force is zero
b. Shear force is maximum
c. Bending moment is zero d. Axial thrust is zero
94) In the simple bending theory one of the assumptions usually made
is that the plane sections before bending remain plane after bending. This
assumption implies that_______________
a. Stress is uniform in the beam cross-section
b. Stress is uniform in the beam cross section
c. Stress is proportional to the distance from the neutral axis
d. Strain is proportional to the distance from the neutral axis
95) Which of the following statements is/are true for a simply
supported beam?
a.Deflection at supports in a simply supported beam is maximum
b. Deflection is maximum at a point where slope is zero
c. Slope is minimum at supports in a simply supported beam
d. All of the above
96) A cantilever beam rectangular in cross-section is subjected to a
load W at its free end. If the depth of the beam is doubled and the load is
halved, the deflection of the free end as compared to original deflection will be______________
a. One-sixteenth b. One eigth c. Half d. Double
97) A cantilever beam of square section is subjected to a load W at
the free end. If the length of the beam is doubled and load reduced to half,
the deflection at the free end as compared to original deflection would
be_____________
a. 2 times b. 4 times c. 8 times d. 16 times
98) The phenomenon under which the strain of a material varies under
constant stress is known as___________
a. Creep b. Strain
hardening c . Buchinger's effect d. Hysteresis
99) The neutral axis of a simply supported beam is_____________
a.Where fibres are subjected to maximum bending stress
b.When fibres are subjected to minimum bending stress
c.Where fibres are subjected to maximum compression
d.Where fibres do not undergo strain
100) Two beams carrying uniformly distributed load have same depth but
beams A has width 2nd as compared to width w for beam B. The ratio of elastic
strength of beam A compared to that of B will be______________
a. 1 b. 2 c. 4 d. 8
101) Two beams carrying identical loads simply supported are having
same width but beam A has double the depth as compared to that of beam B. The
ratio of elastic strength of beam A compared to that of B will
be_______________
a. 2 b. 4 c. 8 d. 16
102) The stress at neutral axis is______________
a. zero b. maximum tensile c. minimum compressive d. minimum tensile
103) The neutral axis of beam_____________
a. is subjected to maximum stress
b. is subjected to maximum shear force
c. has tensile stress on one side and compressive stress on the other
d. is in the same plane in which the beam bends
104) The limit within which Hooke's law holds good is known
as__________
a. Elastic limit b. Plastic limit c. Yield point d. Eulers limit
105) If there is an uniform distribution of load between two points
then the bending moment
changes _________________.
a. Parabolic b.
Straight Line c. Hyperbolic d.
None of these
106) According to Hook’s law, the stress-strain graph below elastic
limit is _________.
a. Parabolic b.
Straight Line c. Hyperbolic d. None of these
107) If the bending moment between two points ‘AB’ of a cantilever
beam is a sloped straight line,
because of ____________.
a. The cantilever carries uniformly distributed load between AB.
b. The cantilever carries uniformly varied load between AB.
c. The cantilever carries point load between AB.
d. There is no load at point A and point B.
108) The Young’s modulus (E) of
the steel is 200 GPa, express the value of E in terms of N/m2
____________
a. 2 x 1011 b. 2 x 103
c. 2 x 109 d.
none of these
109) Shear stress is also called as__________________________.
a. Volumetric stress
b. Normal Stress c. Direct stress d. Tangential stress
110) The design of a beam is based on strength criteria, if the beam
is sufficiently strong to resist
_______
a. shear force b. deflection c. both a. and b. d. none of the above
111) The assumptions generally made in the theory of pure bending
is____________
a. The value of the Young's modulus is the same for the beam material
in tension as well as= in compression
b. The elastic limit is well exceeded
c. The material of the beam is non-homogeneous
d. The transverse section of the beam suffers permanent distortion
112) Uniformly distributed load of 5 kN acts on a simply supported
beam of length 10 m. What are
the reactions at end points of the beam?
a. 12.5 kN b. 25 kN c. 50 kN d. None of the above
113) Two beams carrying uniformly distributed load have same depth but
beams A has width 2nd
as compared to width w for beam B. The ratio of elastic strength of
beam A compared to that
of B will be_________________
a. 1 b. 2 c. 4 d. 1/2
114) Which of the following is a differential equation for deflection?
a. dy / dx = (M/EI) b.
dy / dx = (MI/E) c. d2y / dx2=
(M/EI) d. d2y / dx2= (ME/I)
115) The vertical distance between the axis of the beam before and
after loading at a point is
called as ______________
a. deformation b.
deflection c. slope d. none of the above
116) The beam having one end free and one end fixed is called as
_______
a. Cantilever beam b. Continuous beam c. Overhang beam d. Simply supported beam
117) In cantilever beam, slope and deflection at free end is _____
a. zero b. maximum c. minimum d. none of the above
118) Which of the following is an elastic curve equation for shear
force?
(EI = flexural rigidity)
a. S = EI (dy/dx) b. S = EI (d2y /dx2) c. S = EI (d3y / dx3) d. S = EI (d4y/ dx4)
119) Deflection of a simply supported beam when subjected to central
point load is given as
________
a.(Wl /16 EI) b. (Wl2/16
EI) c. (Wl3/48 EI) d. (5Wl4/ 384EI)
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