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1000+ Strength of Materials Multiple Choice Question Answer [Solved]

Thursday 9th of March 2023

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1. Otto cycle is also known as
A. Constant pressure cycle
B. Constant volume cycle
C. Constant temperature cycle
D. Constant temperature and pressure cycle
Answer : B
2. Which of the following is the correct statement?
A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.
Answer : C
3. The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.
A. Equal to
B. More than
C. Less than
D. None of these
Answer : B
4. The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the fixed end.
A. wl/4
B. wl/2
C. wl
D. wl²/2
Answer : D
5. 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
6. 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
7. When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
A. Zero
B. 1/5
C. 4/5
D. 1
Answer : A
8. 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
Answer : C
9. The atomic mass of sulphur is
A. 12
B. 14
C. 16
D. 32
Answer : D
10. Which of the following is correct?
A. Gauge pressure = Absolute pressure + Atmospheric pressure
B. Absolute pressure = Gauge pressure + Atmospheric pressure
C. Absolute pressure = Gauge pressure - Atmospheric pressure
D. Atmospheric pressure = Absolute pressure + Gauge pressure
Answer : B
11. 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
12. Stirling and Ericsson cycles are
A. Reversible cycles
B. Irreversible cycles
C. Semi-reversible cycles
D. Quasi-static cycles
Answer : A
13. In compression test, the fracture in cast iron specimen would occur along
A. The axis of load
B. An oblique plane
C. At right angles to the axis of specimen
D. Would not occur
Answer : B
14. In a free expansion process,
A. W1 - 2 = 0
B. Q1 - 2 = 0
C. dU = 0
D. All of these
Answer : D
15. A cylindrical section having no joint is known as
A. Joint less section
B. Homogeneous section
C. Perfect section
D. Seamless section
Answer : D
16. The distance between the centres of the rivets in adjacent rows of zigzag riveted joint is known as
A. Pitch
B. Back pitch
C. Diagonal pitch
D. Diametric pitch
Answer : C
17. The materials which exhibit the same elastic properties in all directions are called
A. Homogeneous
B. Inelastic
C. Isotropic
D. Isentropic
Answer : C
18. Strain re-setters are used to
A. Measure shear strain
B. Measure linear strain
C. Measure volumetric strain
D. Relieve strain
Answer : B
19. Carnot cycle has maximum efficiency for
A. Petrol engine
B. Diesel engine
C. Reversible engine
D. Irreversible engine
Answer : C
20. The atomic mass of oxygen is
A. 12
B. 14
C. 16
D. 32
Answer : C
21. Shear stress induced in a shaft subjected to tension will be
A. Maximum at periphery and zero at center
B. Maximum at center
C. Uniform throughout
D. None of the above
Answer : D
22. 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
23. 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
24. 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
Answer : A
25. 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
26. 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
27. Formula based on IS codes is based on
A. Straight line formula
B. Eulers formula
C. Rankines formula
D. Secant formula
Answer : D
28. 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. Poisson's ratio
Answer : D
29. A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : C
30. 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
31. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kelvin Planck's law
Answer : A
32. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
A. 0.086
B. 1.086
C. 1.086
D. 4.086
Answer : B
33. The process is adiabatic, if the value of n in the equation pvn = C, is
A. 0
B. 1
C. ?
D. ?
Answer : C
34. Which of the following is an intensive property of a thermodynamic system?
A. Volume
B. Temperature
C. Mass
D. Energy
Answer : B
35. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
A. (T1/T2) - 1
B. 1 - (T1/T2)
C. 1 - (T2/T1)
D. 1 + (T2/T1)
Answer : C
36. When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called
A. Wood charcoal
B. Bituminous coal
C. Briquetted coal
D. None of these
Answer : D
37. Workdone in a free expansion process is
A. Zero
B. Minimum
C. Maximum
D. Positive
Answer : A
38. The hyperbolic process is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A
39. 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
40. A thin cylindrical shell of diameter (D) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is
A. (m - 1)/ (2m - 1)
B. (2m - 1)/ (m - 1)
C. (m - 2)/ (3m - 4)
D. (m - 2)/ (5m - 4)
Answer : D
41. 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
42. A double strap butt joint with equal straps is
A. Always in single shear
B. Always in double shear
C. Either in single shear or double shear
D. None of these
Answer : B
43. The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
A. 0
B. 1
C. ?
D. ?
Answer : B
44. 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
45. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m, and then the hoop stress will be
A. 30 MN/m²
B. 50 MN/m²
C. 100 MN/m²
D. 200 MN/m²
Answer : C
46. The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is
A. 10 MPa
B. 30 MPa
C. 50 MPa
D. 100 MPa
Answer : C
47. 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
48. 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
49. 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
50. A molecule consisting of one atom is known as
A. Mono-atomic
B. Di-atomic
C. Tri-atomic
D. Poly-atomic
Answer : A
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