1000+ Strength of Materials Multiple Choice Question Answer [Solved]
Thursday 9th of March 2023
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1. A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be
A. Same
B. Double
C. Half
D. One-fourth
Answer : B
A. Same
B. Double
C. Half
D. One-fourth
Answer : B
2. The materials which exhibit the same elastic properties in all directions are called
A. Homogeneous
B. Inelastic
C. Isotropic
D. Isentropic
Answer : C
A. Homogeneous
B. Inelastic
C. Isotropic
D. Isentropic
Answer : C
3. 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
4. For riveting, the size of hole drilled in plates is __________ shank diameter of rivet.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C
5. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as
A. Reversible cycle
B. Irreversible cycle
C. Thermodynamic cycle
D. None of these
Answer : C
A. Reversible cycle
B. Irreversible cycle
C. Thermodynamic cycle
D. None of these
Answer : C
6. 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
7. 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
8. The efficiency of Joule cycle is
A. Greater than Carnot cycle
B. Less than Carnot cycle
C. Equal to Carnot cycle
D. None of these
Answer : B
A. Greater than Carnot cycle
B. Less than Carnot cycle
C. Equal to Carnot cycle
D. None of these
Answer : B
9. The deformation per unit length is called
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Strain
Answer : D
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Strain
Answer : D
10. 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
11. 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 etc.
Answer : A
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 etc.
Answer : A
12. The entropy __________ in an irreversible cyclic process.
A. Remains constant
B. Decreases
C. Increases
D. None of these
Answer : C
A. Remains constant
B. Decreases
C. Increases
D. None of these
Answer : C
13. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is
A. Same
B. Twice
C. Four times
D. Eight times
Answer : C
A. Same
B. Twice
C. Four times
D. Eight times
Answer : C
14. The efficiency of Carnot cycle is maximum for
A. Gas engine
B. Petrol engine
C. Steam engine
D. Reversible engine
Answer : D
A. Gas engine
B. Petrol engine
C. Steam engine
D. Reversible engine
Answer : D
15. 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
16. 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
17. Otto cycle consists of following four processes
A. Two isothermals and two isentropic
B. Two isentropic and two constant volumes
C. Two isentropic, one constant volume and one constant pressure
D. Two isentropic and two constant pressures
Answer : B
A. Two isothermals and two isentropic
B. Two isentropic and two constant volumes
C. Two isentropic, one constant volume and one constant pressure
D. Two isentropic and two constant pressures
Answer : B
18. Which of the following is correct?
A. Absolute pressure = Gauge pressure + Atmospheric pressure
B. Gauge pressure = Absolute pressure + Atmospheric pressure
C. Atmospheric pressure = Absolute pressure + Gauge pressure
D. Absolute pressure = Gauge pressure - Atmospheric pressure
Answer : A
A. Absolute pressure = Gauge pressure + Atmospheric pressure
B. Gauge pressure = Absolute pressure + Atmospheric pressure
C. Atmospheric pressure = Absolute pressure + Gauge pressure
D. Absolute pressure = Gauge pressure - Atmospheric pressure
Answer : A
19. One kg of hydrogen requires 8 kg of oxygen and produces
A. 1 kg of water
B. 7 kg of water
C. 8 kg of water
D. 9 kg of water
Answer : D
A. 1 kg of water
B. 7 kg of water
C. 8 kg of water
D. 9 kg of water
Answer : D
20. A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to
A. wl/6
B. wl/3
C. wl
D. 2wl/3
Answer : A
A. wl/6
B. wl/3
C. wl
D. 2wl/3
Answer : A
21. The efficiency and work ratio of a simple gas turbine cycle are
A. Low
B. Very low
C. High
D. Very high
Answer : B
A. Low
B. Very low
C. High
D. Very high
Answer : B
22. The columns whose slenderness ratio is less than 80, are known as
A. Short columns
B. Long columns
C. Weak columns
D. Medium columns
Answer : A
A. Short columns
B. Long columns
C. Weak columns
D. Medium columns
Answer : A
23. Strain energy is the
A. Energy stored in a body when strained within elastic limits
B. Energy stored in a body when strained up to the breaking of a specimen
C. Maximum strain energy which can be stored in a body
D. Proof resilience per unit volume of a material
Answer : A
A. Energy stored in a body when strained within elastic limits
B. Energy stored in a body when strained up to the breaking of a specimen
C. Maximum strain energy which can be stored in a body
D. Proof resilience per unit volume of a material
Answer : A
24. Modulus of rigidity may be defined as the ratio of
A. Linear stress to lateral strain
B. Lateral strain to linear strain
C. Linear stress to linear strain
D. Shear stress to shear strain
Answer : D
A. Linear stress to lateral strain
B. Lateral strain to linear strain
C. Linear stress to linear strain
D. Shear stress to shear strain
Answer : D
25. When the expansion or compression takes place according to the law pvn = C, the process is known as
A. Isothermal process
B. Adiabatic process
C. Hyperbolic process
D. Polytropic process
Answer : D
A. Isothermal process
B. Adiabatic process
C. Hyperbolic process
D. Polytropic process
Answer : D
26. 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
27. 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
28. The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is
A. 2/3
B. 3/4
C. 1
D. 9/8
Answer : D
A. 2/3
B. 3/4
C. 1
D. 9/8
Answer : D
29. Producer 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 : A
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 : A
30. 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
31. When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
A. Young's modulus
B. Modulus of rigidity
C. Bulk modulus
D. Poisson's ratio
Answer : C
A. Young's modulus
B. Modulus of rigidity
C. Bulk modulus
D. Poisson's ratio
Answer : C
32. 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
33. Shear modulus is the ratio of
A. Linear stress to linear strain
B. Linear stress to lateral strain
C. Volumetric strain to linear strain
D. Shear stress to shear strain
Answer : D
A. Linear stress to linear strain
B. Linear stress to lateral strain
C. Volumetric strain to linear strain
D. Shear stress to shear strain
Answer : D
34. The value of modulus of elasticity for mild steel is of the order of
A. 2.1 × 10? kg/cm²
B. 2.1 × 10? kg/cm²
C. 2.1 × 10? kg/cm²
D. 0.1 × 10? kg/cm²
Answer : B
A. 2.1 × 10? kg/cm²
B. 2.1 × 10? kg/cm²
C. 2.1 × 10? kg/cm²
D. 0.1 × 10? kg/cm²
Answer : B
35. For a beam, as shown in the below figure, the deflection at C is (where E = Young's modulus for the beam material, and I = Moment of inertia of the beam section.
A. Wl3/48 EI
B. Wa²b²/3EIl
C. [Wa/(a?3) x EIl] x (l² - a²)3/2
D. 5Wl3/384 EI
Answer : B
A. Wl3/48 EI
B. Wa²b²/3EIl
C. [Wa/(a?3) x EIl] x (l² - a²)3/2
D. 5Wl3/384 EI
Answer : B
36. When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by
A. Cd?/D3n
B. Cd?/2D3n
C. Cd?/4D3n
D. Cd?/8D3n
Answer : D
A. Cd?/D3n
B. Cd?/2D3n
C. Cd?/4D3n
D. Cd?/8D3n
Answer : D
37. 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 and loge (original area/ instantaneous area)
C. Load/ instantaneous cross-sectional area and change in length/ original length
D. Load/ instantaneous area and instantaneous area/original area
Answer : B
A. Load/original cross-sectional area and change in length/original length
B. Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)
C. Load/ instantaneous cross-sectional area and change in length/ original length
D. Load/ instantaneous area and instantaneous area/original area
Answer : B
38. 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.
A. The shaft 'B' has the greater diameter
B. The shaft 'A' has the greater diameter
C. Both are of same diameter
D. None of these
Answer : B
A. The shaft 'B' has the greater diameter
B. The shaft 'A' has the greater diameter
C. Both are of same diameter
D. None of these
Answer : B
39. If the slenderness ratio for a column is 100, then it is said to be a _________ column.
A. Long
B. Medium
C. Short
D. None of these
Answer : A
A. Long
B. Medium
C. Short
D. None of these
Answer : A
40. The universal gas constant (or molar constant) of a gas is the product of
A. Molecular mass of the gas and the gas constant
B. Atomic mass of the gas and the gas constant
C. Molecular mass of the gas and the specific heat at constant pressure
D. Molecular mass of the gas and the specific heat at constant volume
Answer : A
A. Molecular mass of the gas and the gas constant
B. Atomic mass of the gas and the gas constant
C. Molecular mass of the gas and the specific heat at constant pressure
D. Molecular mass of the gas and the specific heat at constant volume
Answer : A
41. In the below figure, the stress corresponding to point D is
A. Yield point stress
B. Beaking stress
C. Ultimate stress
D. Elastic limit
Answer : C
A. Yield point stress
B. Beaking stress
C. Ultimate stress
D. Elastic limit
Answer : C
42. Which of the following statement is incorrect?
A. The liquid fuels consist of hydrocarbons.
B. The liquid fuels have higher calorific value than solid fuels.
C. The solid fuels have higher calorific value than liquid fuels.
D. A good fuel should have low ignition point.
Answer : C
A. The liquid fuels consist of hydrocarbons.
B. The liquid fuels have higher calorific value than solid fuels.
C. The solid fuels have higher calorific value than liquid fuels.
D. A good fuel should have low ignition point.
Answer : C
43. 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
44. When a gas is heated, change takes place in
A. Pressure
B. Volume
C. Temperature
D. All of these
Answer : D
A. Pressure
B. Volume
C. Temperature
D. All of these
Answer : D
45. 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
46. Strain is equal to (where l = Original length, and ?l = Change in length)
A. l/?l
B. ?l/l
C. l.?l
D. l + ?l
Answer : B
A. l/?l
B. ?l/l
C. l.?l
D. l + ?l
Answer : B
47. The rivets are used for __________ fastenings.
A. Permanent
B. Temporary
C. Semi-permanent
D. None of these
Answer : A
A. Permanent
B. Temporary
C. Semi-permanent
D. None of these
Answer : A
48. The buckling load for a given column depends upon
A. Area of cross-section of the column
B. Length and least radius of gyration of the column
C. Modulus of elasticity for the material of the column
D. All of the above
Answer : D
A. Area of cross-section of the column
B. Length and least radius of gyration of the column
C. Modulus of elasticity for the material of the column
D. All of the above
Answer : D
49. Which of the following statement is wrong?
A. The deformation of the bar per unit length in the direction of the force is called linear strain.
B. The Poisson's ratio is the ratio of lateral strain to the linear strain.
C. The ratio of change in volume to the original volume is called volumetric strain.
D. The bulk modulus is the ratio of linear stress to the linear strain.
Answer : D
A. The deformation of the bar per unit length in the direction of the force is called linear strain.
B. The Poisson's ratio is the ratio of lateral strain to the linear strain.
C. The ratio of change in volume to the original volume is called volumetric strain.
D. The bulk modulus is the ratio of linear stress to the linear strain.
Answer : D
50. 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