Strength of Materials 1000+ MCQ with answer for SSC MTS
Thursday 9th of March 2023
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1. Which of the following is the correct statement of the second law of thermodynamics?
A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.
C. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.
D. All of the above
Answer : D
A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.
C. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.
D. All of the above
Answer : D
2. The fuel mostly used in blast furnace for extracting pig iron from iron ores is
A. Hard coke
B. Soft coke
C. Pulverised coal
D. Bituminous coal
Answer : A
A. Hard coke
B. Soft coke
C. Pulverised coal
D. Bituminous coal
Answer : A
3. First law of thermodynamics deals with
A. Conservation of heat
B. Conservation of momentum
C. Conservation of mass
D. Conservation of energy
Answer : D
A. Conservation of heat
B. Conservation of momentum
C. Conservation of mass
D. Conservation of energy
Answer : D
4. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A. Combustion is at constant volume
B. Expansion and compression are isentropic
C. Maximum temperature is higher
D. Heat rejection is lower
Answer : D
A. Combustion is at constant volume
B. Expansion and compression are isentropic
C. Maximum temperature is higher
D. Heat rejection is lower
Answer : D
5. An isothermal process is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A
6. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : C
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : C
7. When a gas is heated at constant pressure
A. Its temperature will increase
B. Its volume will increase
C. Both temperature and volume will increase
D. Neither temperature not volume will increase
Answer : C
A. Its temperature will increase
B. Its volume will increase
C. Both temperature and volume will increase
D. Neither temperature not volume will increase
Answer : C
8. When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ?? = Hoop strain, and ?? = Longitudinal strain)
A. 2?? - ??
B. 2?? + ??
C. 2?? - ??
D. 2?? + ??
Answer : B
A. 2?? - ??
B. 2?? + ??
C. 2?? - ??
D. 2?? + ??
Answer : B
9. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : B
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : B
10. A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : A
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : A
11. For the same compression ratio, the efficiency of dual combustion cycle is
A. Greater than Diesel cycle and less than Otto cycle
B. Less than Diesel cycle and greater than Otto cycle
C. Greater than Diesel cycle
D. Less than Diesel cycle
Answer : A
A. Greater than Diesel cycle and less than Otto cycle
B. Less than Diesel cycle and greater than Otto cycle
C. Greater than Diesel cycle
D. Less than Diesel cycle
Answer : A
12. 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
Answer : B
A. Increase
B. Decrease
C. Remain same
D. Increase initially and then decrease
Answer : B
13. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : A
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : A
14. The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is
A. Same
B. Double
C. Half
D. Four times
Answer : C
A. Same
B. Double
C. Half
D. Four times
Answer : C
15. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called
A. Creeping
B. Yielding
C. Breaking
D. Plasticity
Answer : A
A. Creeping
B. Yielding
C. Breaking
D. Plasticity
Answer : A
16. The heat and mechanical energies are mutually convertible. This statement was established by
A. Boyle
B. Charles
C. Joule
D. None of these
Answer : C
A. Boyle
B. Charles
C. Joule
D. None of these
Answer : C
17. The amount of heat generated per kg of fuel is known as
A. Calorific value
B. Heat energy
C. Lower calorific value
D. Higher calorific value
Answer : A
A. Calorific value
B. Heat energy
C. Lower calorific value
D. Higher calorific value
Answer : A
18. The standard value of atmospheric pressure taken at sea level is
A. 1.013 bar
B. 760 mm of Hg
C. 1013 × 102 N/m2
D. All of these
Answer : D
A. 1.013 bar
B. 760 mm of Hg
C. 1013 × 102 N/m2
D. All of these
Answer : D
19. The maximum shear stress, in the given figure, is equal to __________ of the Mohr's circle.
A. Radius
B. Diameter
C. Circumference
D. Area
Answer : A
A. Radius
B. Diameter
C. Circumference
D. Area
Answer : A
20. The extension of a circular bar tapering uniformly from diameter d? at one end to diameter d? at the other end and subjected to an axial pull of P is given by
A. ?l = 4PE/ ?l²
B. ?l = 4?ld²/PE
C. ?l = 4Pl/?Ed?d?
D. ?l = 4PlE/ ?d?d?
Answer : C
A. ?l = 4PE/ ?l²
B. ?l = 4?ld²/PE
C. ?l = 4Pl/?Ed?d?
D. ?l = 4PlE/ ?d?d?
Answer : C
21. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
A. Workdone
B. Entropy
C. Enthalpy
D. None of these
Answer : C
A. Workdone
B. Entropy
C. Enthalpy
D. None of these
Answer : C
22. A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
A. Same
B. Lower
C. Higher
D. None of these
Answer : C
A. Same
B. Lower
C. Higher
D. None of these
Answer : C
23. When the gas is cooled at constant pressure,
A. Its temperature increases but volume decreases
B. Its volume increases but temperature decreases
C. Both temperature and volume increases
D. Both temperature and volume decreases
Answer : D
A. Its temperature increases but volume decreases
B. Its volume increases but temperature decreases
C. Both temperature and volume increases
D. Both temperature and volume decreases
Answer : D
24. An adiabatic process is one in which
A. No heat enters or leaves the gas
B. The temperature of the gas changes
C. The change in internal energy is equal to the mechanical workdone
D. All of the above
Answer : D
A. No heat enters or leaves the gas
B. The temperature of the gas changes
C. The change in internal energy is equal to the mechanical workdone
D. All of the above
Answer : D
25. If the rivets in adjacent rows are staggered and the outermost row has only one rivets, the arrangement of the rivets is called
A. Chain riveting
B. Zigzag riveting
C. Diamond riveting
D. Crisscross riveting
Answer : C
A. Chain riveting
B. Zigzag riveting
C. Diamond riveting
D. Crisscross riveting
Answer : C
26. When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
A. Equal to
B. Directly proportional to
C. Inversely proportional to
D. Independent of
Answer : B
A. Equal to
B. Directly proportional to
C. Inversely proportional to
D. Independent of
Answer : B
27. One kilowatt is equal to
A. 1 N-m/s
B. 100 N-m
C. 1000 N-m/s
D. 1 × 106 N-m/s
Answer : C
A. 1 N-m/s
B. 100 N-m
C. 1000 N-m/s
D. 1 × 106 N-m/s
Answer : C
28. The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be
A. 1 : 2
B. 1 : 3
C. 1 : 4
D. 1 : 2.5
Answer : B
A. 1 : 2
B. 1 : 3
C. 1 : 4
D. 1 : 2.5
Answer : B
29. A cylindrical section having no joint is known as
A. Joint less section
B. Homogeneous section
C. Perfect section
D. Seamless section
Answer : D
A. Joint less section
B. Homogeneous section
C. Perfect section
D. Seamless section
Answer : D
30. Which of the following statement is wrong?
A. The closed cycle gas turbine plants are external combustion plants.
B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.
Answer : B
A. The closed cycle gas turbine plants are external combustion plants.
B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.
Answer : B
31. The atomic mass of sulphur is
A. 12
B. 14
C. 16
D. 32
Answer : D
A. 12
B. 14
C. 16
D. 32
Answer : D
32. The entropy of water at 0°C is assumed to be
A. 1
B. 0
C. -1
D. 10
Answer : B
A. 1
B. 0
C. -1
D. 10
Answer : B
33. Those substances which have so far not been resolved by any means into other substances of simpler form are called
A. Elements
B. Compounds
C. Atoms
D. Molecules
Answer : A
A. Elements
B. Compounds
C. Atoms
D. Molecules
Answer : A
34. In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be
A. Increase key length
B. Increase key depth
C. Increase key width
D. Double all the dimensions
Answer : C
A. Increase key length
B. Increase key depth
C. Increase key width
D. Double all the dimensions
Answer : C
35. The ratio of molar specific heats for mono-atomic gas is
A. 1
B. 1.4
C. 1.67
D. 1.87
Answer : C
A. 1
B. 1.4
C. 1.67
D. 1.87
Answer : C
36. Which of the following is a reversible non-flow process?
A. Isochoric process
B. Isobaric process
C. Hyperbolic process
D. All of these
Answer : D
A. Isochoric process
B. Isobaric process
C. Hyperbolic process
D. All of these
Answer : D
37. The natural solid fuel is
A. Wood
B. Coke
C. Anthracite coal
D. Pulverised coal
Answer : A
A. Wood
B. Coke
C. Anthracite coal
D. Pulverised coal
Answer : A
38. 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 : D
A. Uniform throughout
B. Increase uniformly
C. First increase and then decrease
D. Increase uniformly first and then increase rapidly
Answer : D
39. 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
Answer : C
A. Volumetric stress and volumetric strain
B. Lateral stress and lateral strain
C. Longitudinal stress and longitudinal strain
D. Shear stress to shear strain
Answer : C
40. The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is
A. L = l/2
B. L = l/?2
C. L = l
D. L = 2l
Answer : A
A. L = l/2
B. L = l/?2
C. L = l
D. L = 2l
Answer : A
41. The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : A
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : A
42. The intensity of stress which causes unit strain is called
A. Unit mass
B. Modulus of rigidity
C. Bulk modulus
D. Modulus of Elasticity
Answer : D
A. Unit mass
B. Modulus of rigidity
C. Bulk modulus
D. Modulus of Elasticity
Answer : D
43. The radius of the Mohrs circle in the given figure is equal to
A. Sum of two principal stresses
B. Difference of two principal stresses
C. Half the sum of two principal stresses
D. Half the difference of two principal stresses
Answer : D
A. Sum of two principal stresses
B. Difference of two principal stresses
C. Half the sum of two principal stresses
D. Half the difference of two principal stresses
Answer : D
44. The throttling process is __________ process.
A. Reversible
B. Irreversible
C. Reversible or irreversible
D. None of these
Answer : B
A. Reversible
B. Irreversible
C. Reversible or irreversible
D. None of these
Answer : B
45. The general law for the expansion or compression of gases, is
A. pv = C
B. pv = m R T
C. pvn = C
D. pv? = C
Answer : C
A. pv = C
B. pv = m R T
C. pvn = C
D. pv? = C
Answer : C
46. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
A. Flow processes
B. Non-flow processes
C. Adiabatic processes
D. None of these
Answer : A
A. Flow processes
B. Non-flow processes
C. Adiabatic processes
D. None of these
Answer : A
47. The bending equation is
A. M/I = ?/y = E/R
B. T/J = ?/R = C?/l
C. M/R = T/J = C?/l
D. T/l= ?/J = R/C?
Answer : A
A. M/I = ?/y = E/R
B. T/J = ?/R = C?/l
C. M/R = T/J = C?/l
D. T/l= ?/J = R/C?
Answer : A
48. A masonry dam may fail due to
A. Tension in the masonry of the dam and its base
B. Overturning of the dam
C. Crushing of masonry at the base of the dam
D. Any one of the above
Answer : D
A. Tension in the masonry of the dam and its base
B. Overturning of the dam
C. Crushing of masonry at the base of the dam
D. Any one of the above
Answer : D
49. When a bar is cooled to - 5°C, it will develop
A. No stress
B. Shear stress
C. Tensile stress
D. Compressive stress
Answer : C
A. No stress
B. Shear stress
C. Tensile stress
D. Compressive stress
Answer : C
50. One Joule (J) is equal to
A. 1 N-m
B. 1 kN-m
C. 10 N-m/s
D. 10 kN-m/s
Answer : A
A. 1 N-m
B. 1 kN-m
C. 10 N-m/s
D. 10 kN-m/s
Answer : A
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