Strength of Materials MCQs
Strength of Materials MCQs
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1: A beam encastered at both the ends is called
A. Cantilever beam
B. Simply supported beam
C. Fixed beam
D. Continuous beam
2: The object of caulking in a riveted joint is to make the joint
A. Free from corrosion
B. Free from stresses
C. Stronger in tension
D. Leak-proof
3: Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.
A. False
B. True
4: When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.
A. Single riveted
B. Double riveted
5: A column that fails due to direct stress, is called
A. Short column
B. Medium column
C. Weak column
D. Long column
6: The neutral axis of the cross-section a beam is that axis at which the bending stress is
A. Maximum
B. Infinity
C. Minimum
D. Zero
7: A reinforced cement concrete beam is considered to be made of
A. Isotropic material
B. Homogeneous material
C. Hetrogeneous material
D. Composite material
8: In compression test, the fracture in cast iron specimen would occur along
A. The axis of load
B. Would not occur
C. At right angles to the axis of specimen
D. An oblique plane
9: The deformation per unit length is called
A. Shear stress
B. Strain
C. Tensile stress
D. Compressive stress
10: Strain resetters are used to
A. Measure linear strain
B. Relieve strain
C. Measure volumetric strain
D. Measure shear strain
11: The thermal stress __________ upon the cross-sectional area of the bar.
A. Depends
B. Does not depend
12: Two closely-coiled helical springs 'A' and 'B' of the same matenal, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
A. 2
B. 1/8
C. 1/4
D. 4
13: The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
A. Equal to
B. Twice
C. Four times
D. One-half
14: The energy stored in a body when strained within elastic limit is known as
A. Proof resilience
B. Resilience
C. Impact energy
D. Strain energy
15: When a column is subjected to an eccentric load, the stress induced in the column will be
A. Direct and bending stress both
B. Direct stress only
C. Shear stress only
D. Bending stress only
16: The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.
A. Same
B. Double
C. Six times
D. Four times
17: The maximum stress produced in a bar of tapering section is at
A. Anywhere
B. Middle
C. Larger end
D. Smaller end
18: The point of contraflexure is a point where
A. Bending moment changes sign
B. Bending moment is maximum
C. Shear force is maximum
D. Shear force changes sign
19: When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
A. Top layer
B. Every cross-section
C. Bottom layer
D. Neutral axis
20: The limit of eccentricity is based upon no tension condition.
A. True
B. False
21: Metal patterns are used for
A. Small castings
B. Large scale production of castings
C. Large castings
D. Complicated castings
22: A ____ is an electronic circuit
A. Voltage limiter
B. Current limiter
C. Short circuit
D. Voltage regulator
23: What is a synonym for "strength of materials"?
A. Metallurgy
B. Mechanics of materials
C. Engineering materials
D. Properties of materials
E. Strength of materials
24: What type of school does the study of the behavior of solid objects fall under the field of?
A. Thermodynamics
B. Mechanics
C. Physics
D. Strength of materials
25: What does the term "strength" mean in materials science?
A. Height of a material's Young's modulus
B. Volume of a material
C. Amount of stress within a material
D. Size of the material
E. Ability to withstand an applied load without failure
26: What is the ability of a material to withstand an applied load?
A. Elasticity
B. Density
C. Strength
D. Toughness
27: What is the unit used to measure stress?
A. Kilopols
B. Joules
C. Pounds per square inch
D. Millimeters of mercury
E. Hertz
28: What is the cross-sectional area of an element in tension?
A. Tension
B. Pressure
C. Elongation
D. Stress
E. Area
29: A measure of the deformation of the material that is what is it?
A. Elasticity
B. Inch
C. Young's modulus
D. Dimensionless
E. Pound
30: What term is used to describe the point on a stress-strain curve at which it begins to deviate from the straight-line relationship between stress and strain?
A. Critical stress
B. Maximum stress
C. Hysteresis
D. Proportional limit
E. Linearity
31: What is the maximum stress to which a specimen may be subjected and still return to its original length upon release of the load?
A. Shear stress
B. Damage limit
C. Fracture
D. Elastic limit
E. Tensile stress
32: What does it mean for a material to be stressed within the elastic region?
A. When the strain energy is greater than the elastic limit
B. When the working stress exceeds the elastic limit
C. When a permanent deformation occurs
D. When the working stress does not exceed the elastic limit
E. When the stress decreases with increasing strain
33: What is a point on a stress-strain curve at which there is a sudden increase in strain?
A. Elongation point
B. Yield point
C. Elastic limit
D. Hardening point
E. Fracture
34: What kind of point is yield point?
A. A point on the yield-fracture line
B. A physical characteristic of a material
C. The intersection of the yield and fracture curves
D. A location on a graph
E. A point on the stress-strain curve
35: What is the maximum stress that can be applied without permanent deformation of the test specimen?
A. Yield strength
B. Ultimate tensile strength
C. Shear strength
D. Tensile strength
36: What is the name of the statement that stress is proportional to strain?
A. Newton's Third Law of Motion
B. The First Law of Thermodynamics
C. Hooke's Law
D. The Law of Vibrations
E. Laplace's Law
37: What term is used to describe the greatest stress a material can withstand without deforming?
A. Proportional limit
B. Ultimate limit
C. Ultimate strength
D. Shear stress
E. Strength limit
38: What does dividing the load at failure by the original cross sectional area determine?
A. The probability of failure
B. The likelihood of failure
C. The number of failure points
D. The number of failures
E. The value
39: What does "the maximum stress" mean?
A. Maximum Calories
B. Ultimate strength
C. Maximum effort
D. The height of Mount Everest
40: What does the ELC describe as the point on the stress-strain curve beyond which the material permanently deforms after removing the load?
A. Elastic limit
B. Shear modulus
C. Ultimate tensile strength
D. Failure point
41: What type of force is needed to permanently deform the material after removing the load?
A. Chemical
B. Nuclear
C. Inertial
D. Pushing
E. Elastic
42: What does yield strength indicate that a material will not return to?
A. Its porosity
B. Its width
C. Its thickness
D. Its origin shape or length
E. Its grain size
43: What kind of test determines yield strength?
A. Alliance
B. Bending
C. Shear
D. Tensile
44: What does the term yield strength refer to?
A. Point of failure
B. Maximum stress point
C. Point at which material exceeds the elastic limit
D. Maximum stress that a material can withstand
45: Poisson's ratio is used to measure what?
A. Frequency of earthquakes
B. Amount of bacteria in a sample
C. Lateral to longitudinal strain
D. Amount of blood in an artery
E. Amount of noise in an image
46: What element in a piece of metal stretches in tension when it is bent?
A. Metal
B. Surface
C. Sheath
D. Metal Core
47: What is the term for the line or region of zero stress between the two surfaces?
A. Neutral axis
B. Interface
C. Interface line
D. Perpendicular
E. Parallel
48: What does the term "neutral axis" mean?
A. Equal stress for all runs
B. Equal stress on all axes
C. Zero stress
49: What occurs when the design stress exceeds the material yield strength?
A. Crushing
B. Rupture
C. Shearing
D. Yielding
E. Fracture
50: What is typically maximum surface stress?
A. Design stress
B. Shear stress
C. Ultimate stress
51: 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
E. None of the above.
52: Hooke’s law holds good up to
A. Yield point
B. Limit of proportionality
C. Breaking point
D. Elastic limit
E. Plastic limit.
53: Young’s modulus is defined as the ratio of
A. Volumetric stress and volumetric strain
B. Lateral stress and lateral strain
C. Longitudinal stress and longitudinal strain
D. Shear stress to shear strain
E. Longitudinal stress and lateral strain.
54: The unit of Young’s modulus is
A. Mm/mm
B. Kg/cm
C. Kg
D. Kg/cm2
E. Kg cm2.
55: Deformation per unit length in the direction of force is known as
A. Strain
B. Lateral strain
C. Linear strain
D. Linear stress
E. Unit strain.
56: 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
E. Working stress.
57: The materials having same elastic properties in all directions are called
A. Ideal materials
B. Uniform materials
C. Isotropic materials
D. Paractical materials
E. Elastic materials.
58: 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
E. Increase rapidly first and then uniformly.
59: 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
E. Linear stress and lateral strain.
60: 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. Become one-fourth
E. Remain unaffecte
61: The ultimate tensile stress of mild steel compared to ultimate compressive stress is
A. Same
B. More
C. Less
D. More or less depending on other factors
E. Unpredictable.
62: 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. Average of and
D. Minimum area after fracture
E. None of the above.
63: The impact strength of a material is an index of its
A. Toughness
B. Tensile strength
C. Capability of being cold worked
D. Hardness
E. Fatigue strength.
64: 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. One-fourth
E. Four times.
65: 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%
E. 60%.
66: The intensity of stress which causes unit strain is called
A. Unit stress
B. Bulk modulus
C. Modulus of rigidity
D. Modulus of elasticity
E. Principal stress.
67: 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
E. None of the above.
68: 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. 22 tonnes/cm2
E. None of the above.
69: For steel, the ultimate strength in shear as compared to in tension is nearly
A. Same
B. Half
C. One-third
D. Two-third
E. One-fourth.
70: Which of the following has no unit
A. Kinematic viscosity
B. Surface tension
C. Bulk modulus
D. Strain
E. Elasticity.
71: 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 correlated with stress-strain values in other tests like torsion, impact, combined stress tests et
E. It can be used for compression tests as well.
72: 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. More/less depending on composition
E. May have any value.
73: If a part is constrained to move and heated, it will develop
A. Principal stress
B. Tensile stress
C. Compressive stress
D. Shear stress
E. No stress.
74: Which of the following materials is most elastic
A. Rubber
B. Plastic
C. Brass
D. Steel
E. Glass.
75: The value of modulus of elasticity for mild steel is of the order of
A. 2.1xl05 kg/cm2
B. 2.1 X 106 kg/cm2
C. 2.1 x 107 kg/cm2
D. 0.1 xlO6 kg/cm2 (
76: 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
E. 3 to 4.
77: 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
E. Poisson’s ratio and slenderness ratio.
78: 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
E. None of the above.
79: 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
E. Resilience.
80: The materials which exhibit the same elastic properties in all directions are called
A. Homogeneous
B. Inelastic
C. Isotropic
D. Isentropic
E. Visco-elasti
81: 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
E. 3 to 4.
82: 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
E. Drawabihty.
83: 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
E. None of the above.
84: For which material the Poisson’s ratio is more than unity
A. Steel
B. Copper
C. Aluminium
D. Cast iron
E. None of the above.
85: 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
E. Reliability.
86: 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
E. Unpredictable.
87: 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. 10—25%
D. 5—10%
E. Negligible.
88: If a material expands freely due to heating it will develop
A. Thermal stresses
B. Tensile stress
C. Bending
D. Compressive stress
E. No stress.
89: 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
E. Tensile strain remains constant.
90: 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
E. Equal to that necessary to stop it.
91: In the tensile test, the phenomenon of slow extension of the material, i. stress increasing with the time at a constant load is called
A. Creeping
B. Yielding
C. Breaking
D. Plasticity
E. None of the above.
92: The stress developed in a material at breaking point in extension is called
A. Breaking stress
B. Fracture stress
C. Yield point stress
D. Ultimate tensile stress
E. Proof stress.
93: Rupture stress is
A. Breaking stress
B. Maximum load/original cross-sectional area
C. Load at breaking point/A
D. Load at breaking point/neck area
E. Maximum stress.
94: The elasticity of various materials is controlled by its
A. Ultimate tensile stress
B. Proof stress
C. Stress at yield point
D. Stress at elastic limit
E. Tensile stress.
95: The ratio of lateral strain to the linear strain within elastic limit is known as
A. Young’s modulus
B. Bulk modulus
C. Modulus of rigidity
D. Modulus of elasticity
E. Poisson’s ratio.
96: The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to
A. Young’s modulus
B. Bulk modulus
C. Modulus of rigidity
D. Modulus of elasticity
E. Poisson’s ratio.
97: In question 56, the internal reaction in bottom 80 cm length will be
A. Same in both cases
B. Zero in first case
C. Different in both cases
D. Data are not sufficient to determine same
E. None of the above.
98: Flow stress corresponds to
A. Fluids in motion
B. Breaking point
C. Plastic deformation of solids
D. Rupture stress
E. None of the above.
99: When it is indicated that a member is elastic, it means that when force is applied, it will
A. Not deform
B. Be safest
C. Stretch
D. Not stretch
E. None of the above.
100: The energy absorbed in a body, when it is strained within the elastic limits, is known as
A. Strain energy
B. Resilience
C. Proof resilience
D. Modulus of resilience
E. Toughness.
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