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

1. Petrol is distilled at
A. 65° to 220°C
B. 220° to 345°C
C. 345° to 470°C
D. 470° to 550°C
Answer : A

2. 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

3. 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

4. One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A. 4/7
B. 11/4
C. 9/7
D. All of these
Answer : A

5. The pull required to crush the rivet per pitch length is
A. p.t.?_t
B. d.t.?_c
C. ?/4 × d² × ?_t
D. ?/4 × d² × ?_c
Answer : B

6. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)
A. R_u × T
B. 1.5 R_u × T
C. 2 R_u × T
D. 3 R_u × T
Answer : B

7. Resilience 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 the specimen maximum strain
C. Energy which can be stored in a body
D. None of the above
Answer : D

8. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. All of these
Answer : D

9. A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : B

10. The measurement of a thermodynamic property known as temperature is based on
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. None of these
Answer : A

11. Modular ratio of two materials is the ratio of
A. Strains
B. Stress and strain
C. Shear stress and shear strain
D. Moduli and elasticity
Answer : D

12. The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
Answer : B

13. For the same maximum pressure and temperature,
A. Otto cycle is more efficient than Diesel cycle
B. Diesel cycle is more efficient than Otto cycle
C. Dual cycle is more efficient than Otto and Diesel cycles
D. Dual cycle is less efficient than Otto and Diesel cycles
Answer : B

14. Diesel cycle consists of __________ processes.
A. Two constant volume and two isentropic
B. Two constant pressure and two isentropic
C. Two constant volume and two isothermal
D. One constant pressure, one constant volume and two isentropic
Answer : D

15. Second law of thermodynamics defines
A. Heat
B. Work
C. Internal energy
D. Entropy
Answer : D

16. 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

17. Which of the following statement is incorrect?
A. The liquid fuels have higher calorific value than solid fuels
B. The solid fuels have higher calorific value than liquid fuels
C. A good fuel should have low ignition point
D. The liquid fuels consist of hydrocarbons
Answer : B

18. 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

19. The efficiency of Stirling cycle is __________ Carnot cycle.
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : C

20. 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

21. For a beam, as shown in the below figure, when the load W is applied in the centre of the beam, the maximum deflection is

A. Wl3 / 48EI
B. 5Wl3 / 384EI
C. Wl3 / 392EI
D. Wl3 / 384EI
Answer : A

22. 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

23. 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

24. In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.
A. Same as
B. Less than
C. Greater than
D. None of these
Answer : B

25. Which of the following statement is correct?
A. The heat and work are boundary phenomena
B. The heat and work represent the energy crossing the boundary of the system
C. The heat and work are path functions
D. All of the above
Answer : D

26. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
A. More
B. Less
C. Equal
D. Depends on other factors
Answer : C

27. 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

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

29. The section modulus of a circular section about an axis through its C.G., is
A. ?d²/4
B. ?d²/16
C. ?d³/16
D. ?d³/32
Answer : D

30. 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

31. 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

32. The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as
A. Element
B. Compound
C. Atom
D. Molecule
Answer : D

33. Which of the following is an intensive property of a thermodynamic system?
A. Volume
B. Temperature
C. Mass
D. Energy
Answer : B

34. 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

35. The specific heat at constant volume is
A. The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
B. The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
C. The amount of heat required to raise the temperature of 1 kg of water through one degree
D. Any one of the above
Answer : B

36. 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
Answer : C

37. The efficiency of a Carnot engine depends on
A. Working substance
B. Design of engine
C. Size of engine
D. Temperatures of source and sink
Answer : D

38. The oxygen atom is ________ times heavier than the hydrogen atom.
A. 2
B. 8
C. 16
D. 32
Answer : C

39. The maximum bending moment for the beam shown in the below figure, is

A. wl²/3?3
B. wl²/6?3
C. wl²/9?3
D. wl²/12?3
Answer : C

40. Which of the following gas has a minimum molecular mass?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Methane
Answer : C

41. According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end free is __________ the crippling load for a similar column hinged at both the ends.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : B

42. One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A. 11/7
B. 9/7
C. 4/7
D. All of the above
Answer : C

43. The total strain energy stored in a body is termed a
A. Resilience
B. Proof resilience
C. Modulus of resilience
D. Toughness
Answer : A

44. 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
Answer : A

45. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. Diesel cycle
Answer : D

46. 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

47. Hooke's law holds good up to
A. Yield point
B. Limit of proportionality
C. Breaking point
D. Elastic limit
Answer : B

48. When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring (?) is given by (where d = Diameter of spring wire, n = No. of turns of the spring, and C = Modulus of rigidity for the spring material)
A. WD3n/Cd?
B. 2WD3n/Cd?
C. 4WD3n/Cd?
D. 8WD3n/Cd?
Answer : D

49. The most probable velocity of the gas molecules is given by
A. ?(KT/m)
B. ?(2KT/m)
C. ?(3KT/m)
D. ?(5KT/m)
Answer : B

50. Which of the following process can be made reversible with the help of a regenerator?
A. Constant pressure process
B. Constant volume process
C. Constant pvn process
D. All of these
Answer : D