Strength of Materials 1000+ MCQ with answer for NEET PG

1. Reversed Joule cycle is known as
A. Carnot cycle
B. Bell-Coleman cycle
C. Rankine cycle
D. Stirling cycle
Answer : B

2. The property of a material which allows it to be drawn into a smaller section is called
A. Plasticity
B. Ductility
C. Elasticity
D. Malleability
Answer : B

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

4. The rivets are used for __________ fastenings.
A. Permanent
B. Temporary
C. Semi-permanent
D. None of these
Answer : A

5. 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

6. The polytropic index (n) is given by
A. log (p₁p₂)/log (v₁v₂)
B. log (p₂/ p₁)/log (v₁/ v₂)
C. log (v₁/ v₂)/ log (p₁/p₂)
D. log [(p1v1)/(p2v2)]
Answer : B

7. Which of the following cycles has maximum efficiency?
A. Rankine
B. Stirling
C. Carnot
D. Brayton
Answer : C

8. One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.
A. 9/7
B. 11/7
C. 7/4
D. 1/4
Answer : A

9. The property of a material by virtue of which it can be beaten or rolled into plates is called
A. Malleability
B. Ductility
C. Plasticity
D. Elasticity
Answer : A

10. 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

11. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
A. r^? - 1
B. 1 - r^? - 1
C. 1 - (1/r) ^{?/? - 1}
D. 1 - (1/r) ^{? - 1/ ?}
Answer : D

12. 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

13. The mass of carbon per kg of flue gas is given by
A. (11/3) CO₂ + (3/7) CO
B. (3/7) CO₂ + (11/3) CO
C. (7/3) CO₂ + (3/11) CO
D. (3/11) CO₂ + (7/3) CO
Answer : A

14. In an irreversible process, there is a
A. Loss of heat
B. No loss of heat
C. Gain of heat
D. No gain of heat
Answer : A

15. The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C

16. Which is the incorrect statement about Carnot cycle?
A. It is used as the alternate standard of comparison of all heat engines.
B. All the heat engines are based on Carnot cycle.
C. It provides concept of maximising work output between the two temperature limits.
D. All of the above
Answer : B

17. 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

18. 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

19. 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

20. In order to know whether a column is long or short, we must know its
A. Ultimate shear stress of the column
B. Factor of safety
C. Torque resisting capacity
D. Slenderness ratio
Answer : D

21. 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

22. Strain re-setters are used to
A. Measure shear strain
B. Measure linear strain
C. Measure volumetric strain
D. Relieve strain
Answer : B

23. According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.
A. Change
B. Do not change
C. Both (A) and (B)
D. None of these
Answer : B

24. The neutral axis of the cross-section a beam is that axis at which the bending stress is
A. Zero
B. Minimum
C. Maximum
D. Infinity
Answer : A

25. The heating of gas at constant volume is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : C

26. 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

27. The stress induced in a body due to suddenly applied load compared to when it is applied gradually is
A. Same
B. Half
C. Two times
D. Four times
Answer : C

28. 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

29. The natural solid fuel is
A. Wood
B. Coke
C. Anthracite coal
D. Pulverised coal
Answer : A

30. Slenderness of a column is zero when
A. Ends are firmly fixed
B. Column is supported on all sides throughout the length
C. Length is equal to radius of gyration
D. Length is twice the radius of gyration
Answer : D

31. Which of the following statement is correct according to Clausis statement of second law of thermodynamics?
A. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
B. It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
C. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
D. None of the above
Answer : B

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

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

34. One kg of carbon produces __________ kg of carbon dioxide.
A. 3/7
B. 7/3
C. 11/3
D. 3/11
Answer : C

35. 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

36. In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
A. Isothermal
B. Isentropic
C. Polytropic
D. None of these
Answer : B

37. 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

38. The property of a material by virtue of which a body returns to its original, shape after removal of the load is called
A. Plasticity
B. Elasticity
C. Ductility
D. Malleability
Answer : B

39. 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

40. Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kinetic theory of gases
Answer : B

41. 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

42. 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

43. The torsional rigidity of a shaft is expressed by the
A. Maximum torque it can transmit
B. Number of cycles it undergoes before failure
C. Elastic limit up to which it resists torsion, shear and bending stresses
D. Torque required to produce a twist of one radian per unit length of shaft
Answer : D

45. A cycle consisting of two adiabatic and two constant pressure processes is known as
A. Otto cycle
B. Ericsson cycle
C. Joule cycle
D. Stirling cycle
Answer : C

46. One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
A. 8/3
B. 11/3
C. 11/7
D. 7/3
Answer : D

47. 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

48. 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

49. 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

50. The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
A. pv = mRT
B. pv = RTm
C. pvm = C
D. pv = (RT)m
Answer : A