Strength of Materials MCQ Solved Paper for SSC GD
Thursday 9th of March 2023
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1. The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is
A. 23.97 bar
B. 25 bar
C. 26.03 bar
D. 34.81 bar
Answer : C
A. 23.97 bar
B. 25 bar
C. 26.03 bar
D. 34.81 bar
Answer : C
2. One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to
A. 800 K
B. 1000 K
C. 1200 K
D. 1400 K
Answer : A
A. 800 K
B. 1000 K
C. 1200 K
D. 1400 K
Answer : A
3. Carbonisation of coal consists of
A. Drying and crushing the coal to a fine powder
B. Moulding the finely ground coal under pressure with or without a binding material
C. Heating the wood with a limited supply of air to temperature not less than 280°C
D. None of the above
Answer : D
A. Drying and crushing the coal to a fine powder
B. Moulding the finely ground coal under pressure with or without a binding material
C. Heating the wood with a limited supply of air to temperature not less than 280°C
D. None of the above
Answer : D
4. Volumetric strain for a rectangular specimen of length l, breadth b and thickness t subjected to a pull of P is given by
A. e (1 - 2m)
B. e (1 - 2/m)
C. e (m - 2)
D. e (2/m - 1)
Answer : B
A. e (1 - 2m)
B. e (1 - 2/m)
C. e (m - 2)
D. e (2/m - 1)
Answer : B
5. The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : A
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : A
6. If Th is the torque resisting capacity of a hollow shaft and Ts is that of a solid shaft, of the same material, length and weight. Then,
A. Th > Ts
B. Th < Ts
C. Th = Ts
D. None of these
Answer : A
A. Th > Ts
B. Th < Ts
C. Th = Ts
D. None of these
Answer : A
7. The ultimate tensile stress of mild steel compared to ultimate compressive stress is
A. Same
B. More
C. Less
D. Unpredictable
Answer : B
A. Same
B. More
C. Less
D. Unpredictable
Answer : B
8. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as
A. Isothermal process
B. Adiabatic process
C. Free expansion process
D. Throttling process
Answer : D
A. Isothermal process
B. Adiabatic process
C. Free expansion process
D. Throttling process
Answer : D
9. 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
10. The stress at which extension of the material takes place more quickly as compared to the increase in load is called
A. Elastic point of the material
B. Plastic point of the material
C. Breaking point of the material
D. Yielding point of the material
Answer : D
A. Elastic point of the material
B. Plastic point of the material
C. Breaking point of the material
D. Yielding point of the material
Answer : D
11. A definite area or a space where some thermodynamic process takes place is known as
A. Thermodynamic system
B. Thermodynamic cycle
C. Thermodynamic process
D. Thermodynamic law
Answer : A
A. Thermodynamic system
B. Thermodynamic cycle
C. Thermodynamic process
D. Thermodynamic law
Answer : A
12. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
A. Tensile
B. Compressive
C. Shear
D. Zero
Answer : B
A. Tensile
B. Compressive
C. Shear
D. Zero
Answer : B
13. The shear force diagram of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length will be
A. A right angled triangle
B. An isosceles triangle
C. An equilateral triangle
D. A rectangle
Answer : A
A. A right angled triangle
B. An isosceles triangle
C. An equilateral triangle
D. A rectangle
Answer : A
14. The value of cp/cv for air is
A. 1
B. 1.4
C. 1.45
D. 2.3
Answer : B
A. 1
B. 1.4
C. 1.45
D. 2.3
Answer : B
15. For the beam shown in the below figure, the shear force diagram between A and B is
A. A horizontal line
B. A vertical line
C. An inclined line
D. A parabolic curve
Answer : D
A. A horizontal line
B. A vertical line
C. An inclined line
D. A parabolic curve
Answer : D
16. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)
A. Ru × T
B. 1.5 Ru × T
C. 2 Ru × T
D. 3 Ru × T
Answer : B
A. Ru × T
B. 1.5 Ru × T
C. 2 Ru × T
D. 3 Ru × T
Answer : B
17. 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
18. The shape of cantilever for uniformly distributed load will be
A. Straight line
B. Parabolic
C. Elliptical
D. Cubic
Answer : B
A. Straight line
B. Parabolic
C. Elliptical
D. Cubic
Answer : B
19. If Kh is the torque resisting capacity of a hollow shaft and Ks is that of a solid shaft, of the same material, length and weight. Then,
A. Kh > Ks
B. Kh < Ks
C. Kh = Ks
D. None of these
Answer : A
A. Kh > Ks
B. Kh < Ks
C. Kh = Ks
D. None of these
Answer : A
20. The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness of plates, and ?t, ? and ?c = Permissible tensile, shearing and crushing stresses respectively)
A. (p - 2d) t × ?c
B. (p - d) t × ?
C. (p - d) t × ?t
D. (2p - d) t × ?t
Answer : C
A. (p - 2d) t × ?c
B. (p - d) t × ?
C. (p - d) t × ?t
D. (2p - d) t × ?t
Answer : C
21. When a body is subjected to a direct tensile stress (?x) in one plane accompanied by a simple shear stress (?xy), the maximum normal stress i
A. (?x/2) + (1/2) × ?(?x² + 4 ?²xy)
B. (?x/2) - (1/2) × ?(?x² + 4 ?²xy)
C. (?x/2) + (1/2) × ?(?x² - 4 ?²xy)
D. (1/2) × ?(?x² + 4 ?²xy)
Answer : A
A. (?x/2) + (1/2) × ?(?x² + 4 ?²xy)
B. (?x/2) - (1/2) × ?(?x² + 4 ?²xy)
C. (?x/2) + (1/2) × ?(?x² - 4 ?²xy)
D. (1/2) × ?(?x² + 4 ?²xy)
Answer : A
22. The heat energy stored in the gas and used for raising the temperature of the gas is known as
A. External energy
B. Internal energy
C. Kinetic energy
D. Molecular energy
Answer : B
A. External energy
B. Internal energy
C. Kinetic energy
D. Molecular energy
Answer : B
23. 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
24. 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
25. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
A. 1/8
B. 1/4
C. 1/2
D. 2
Answer : C
A. 1/8
B. 1/4
C. 1/2
D. 2
Answer : C
26. The deformation of a bar under its own weight is _________ the deformation, if the same body is subjected to a direct load equal to weight of the body.
A. Equal to
B. Half
C. Double
D. Quadruple
Answer : B
A. Equal to
B. Half
C. Double
D. Quadruple
Answer : B
27. The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called
A. Specific heat at constant volume
B. Specific heat at constant pressure
C. kilo-Joule
D. None of these
Answer : C
A. Specific heat at constant volume
B. Specific heat at constant pressure
C. kilo-Joule
D. None of these
Answer : C
28. A cycle consisting of two constant pressure and two isentropic processes is known as
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. None of these
Answer : D
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. None of these
Answer : D
29. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
A. Dual combustion cycle
B. Diesel cycle
C. Atkinson cycle
D. Rankine cycle
Answer : C
A. Dual combustion cycle
B. Diesel cycle
C. Atkinson cycle
D. Rankine cycle
Answer : C
30. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
A. Cut-off is increased
B. Cut-off is decreased
C. Cut-off is zero
D. Cut-off is constant
Answer : C
A. Cut-off is increased
B. Cut-off is decreased
C. Cut-off is zero
D. Cut-off is constant
Answer : C
31. A continuous beam is one which is
A. Fixed at both ends
B. Fixed at one end and free at the other end
C. Supported on more than two supports
D. Extending beyond the supports
Answer : C
A. Fixed at both ends
B. Fixed at one end and free at the other end
C. Supported on more than two supports
D. Extending beyond the supports
Answer : C
32. Workdone in a free expansion process is
A. Zero
B. Minimum
C. Maximum
D. Positive
Answer : A
A. Zero
B. Minimum
C. Maximum
D. Positive
Answer : A
33. The principal constituents of a fuel are
A. Carbon and hydrogen
B. Oxygen and hydrogen
C. Sulphur and oxygen
D. Sulphur and hydrogen
Answer : A
A. Carbon and hydrogen
B. Oxygen and hydrogen
C. Sulphur and oxygen
D. Sulphur and hydrogen
Answer : A
34. Steam coal is a
A. Pulverised coal
B. Brown coal
C. Coking bituminous coal
D. Non-coking bituminous coal
Answer : D
A. Pulverised coal
B. Brown coal
C. Coking bituminous coal
D. Non-coking bituminous coal
Answer : D
35. 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
Answer : B
A. More
B. Less
C. Same
D. More/less depending on composition
Answer : B
36. 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
37. The work ratio of simple gas turbine cycle depends upon
A. Maximum cycle temperature
B. Minimum cycle temperature
C. Pressure ratio
D. All of these
Answer : D
A. Maximum cycle temperature
B. Minimum cycle temperature
C. Pressure ratio
D. All of these
Answer : D
38. The efficiency and work ratio of a simple gas turbine cycle are
A. Very low
B. Low
C. High
D. Very high
Answer : A
A. Very low
B. Low
C. High
D. Very high
Answer : A
39. 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
40. Select the correct statement as per Charles' law
A. p.v = constant, if T is kept constant
B. v/T = constant, if p is kept constant
C. p/T = constant, if v is kept constant
D. T/p = constant, if v is kept constant
Answer : B
A. p.v = constant, if T is kept constant
B. v/T = constant, if p is kept constant
C. p/T = constant, if v is kept constant
D. T/p = constant, if v is kept constant
Answer : B
41. 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
42. Modulus of rigidity is defined as the ratio of
A. Longitudinal stress to longitudinal strain
B. Volumetric stress to volumetric strain
C. Lateral stress to Lateral strain
D. Shear stress to shear strain
Answer : D
A. Longitudinal stress to longitudinal strain
B. Volumetric stress to volumetric strain
C. Lateral stress to Lateral strain
D. Shear stress to shear strain
Answer : D
43. Second law of thermodynamics defines
A. Heat
B. Work
C. Internal energy
D. Entropy
Answer : D
A. Heat
B. Work
C. Internal energy
D. Entropy
Answer : D
44. If a part is constrained to move and heated, it will develop
A. Principal stress
B. Tensile stress
C. Compressive stress
D. Shear stress
Answer : C
A. Principal stress
B. Tensile stress
C. Compressive stress
D. Shear stress
Answer : C
45. 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
46. If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then
A. The material A is more ductile than material B
B. The material B is more ductile than material A
C. The ductility of material A and B is equal
D. The material A is brittle and material B is ductile
Answer : A
A. The material A is more ductile than material B
B. The material B is more ductile than material A
C. The ductility of material A and B is equal
D. The material A is brittle and material B is ductile
Answer : A
47. The assumption made in Euler's column theory is that
A. The failure of column occurs due to buckling alone
B. The length of column is very large as compared to its cross-sectional dimensions
C. The column material obeys Hooke's law
D. All of the above
Answer : D
A. The failure of column occurs due to buckling alone
B. The length of column is very large as compared to its cross-sectional dimensions
C. The column material obeys Hooke's law
D. All of the above
Answer : D
48. Mond gas is obtained by
A. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
B. Carbonisation of bituminous coal
C. Passing steam over incandescent coke
D. Passing air and a large amount of steam over waste coal at about 650°C
Answer : D
A. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
B. Carbonisation of bituminous coal
C. Passing steam over incandescent coke
D. Passing air and a large amount of steam over waste coal at about 650°C
Answer : D
49. 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
50. An open system is one in which
A. Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system
B. Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
C. Both the heat and work as well as mass of the working substance crosses the boundary of the system
D. Neither the heat and work nor the mass of the working substance crosses the boundary of the system
Answer : C
A. Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system
B. Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
C. Both the heat and work as well as mass of the working substance crosses the boundary of the system
D. Neither the heat and work nor the mass of the working substance crosses the boundary of the system
Answer : C
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