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

1. 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

2. 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

3. During which of the following process does heat rejection takes place in Carnot cycle?
A. Isothermal expansion
B. Isentropic expansion
C. Isothermal compression
D. Isentropic compression
Answer : C

4. When gas is heated at constant pressure, the heat supplied is utilised in
A. Increasing the internal energy of gas
B. Doing some external work
C. Increasing the internal energy of gas and also for doing some external work
D. None of the above
Answer : C

5. According to First law of thermodynamics,
A. Total internal energy of a system during a process remains constant
B. Total energy of a system remains constant
C. Workdone by a system is equal to the heat transferred by the system
D. Internal energy, enthalpy and entropy during a process remain constant
Answer : B

6. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, then
A. The stress and strain induced is compressive
B. The stress and strain induced is tensile
C. Both A and B is correct
D. None of these
Answer : A

7. The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as
A. Enthalpy
B. Internal energy
C. Entropy
D. External energy
Answer : C

8. 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

9. 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

10. 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

11. 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

12. Impact strength of a material is an index of its
A. Toughness
B. Tensile strength
C. Capability of being cold worked
D. Hardness
Answer : A

13. The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
A. Boyle's law
B. Charle's law
C. Gay-Lussac law
D. Joule's law
Answer : D

14. 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

15. 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

16. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)
A. v₁/v₂
B. v₂/v₁
C. (v₁ + v₂)/v₁
D. (v₁ + v₂)/v₂
Answer : B

17. 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

18. Which of the following has the highest calorific value?
A. Peat
B. Lignite
C. Bituminous coal
D. Anthracite coal
Answer : D

19. 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

20. 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

21. 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

22. The throttling process is __________ process.
A. Reversible
B. Irreversible
C. Reversible or irreversible
D. None of these
Answer : B

23. 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

24. The ultimate tensile stress of mild steel compared to ultimate compressive stress is
A. Same
B. More
C. Less
D. Unpredictable
Answer : B

25. 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

26. 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

27. An open cycle gas turbine works on
A. Carnot cycle
B. Otto cycle
C. Joule's cycle
D. Stirling cycle
Answer : C

28. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
A. Axis of load
B. Perpendicular to the axis of load
C. Maximum moment of inertia
D. Minimum moment of inertia
Answer : D

29. 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

30. The capacity of a strained body for doing work on the removal of the straining force, is called
A. Strain energy
B. Resilience
C. Proof resilience
D. Impact energy
Answer : B

31. The efficiency and work ratio of a simple gas turbine cycle are
A. Low
B. Very low
C. High
D. Very high
Answer : B

32. The safe twisting moment for a compound shaft is equal to the
A. Maximum calculated value
B. Minimum calculated value
C. Mean value
D. Extreme value
Answer : B

33. 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

34. In the torsion equation T/J = ?/r = G?/ L, the term J/R is called
A. Shear modulus
B. Section modulus
C. Polar modulus
D. None of these
Answer : C

35. 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

36. The efficiency of Diesel cycle with decrease in cut-off
A. Increases
B. Decreases
C. First increases and then decreases
D. First decreases and then increases
Answer : A

37. 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

38. The mass of flue gas per kg of fuel is the ratio of the
A. Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
B. Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
C. Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
D. Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas
Answer : C

39. 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

40. Which of the following materials is most elastic?
A. Rubber
B. Plastic
C. Brass
D. Steel
Answer : D

41. A column that fails due to direct stress, is called
A. Short column
B. Long column
C. Weak column
D. Medium column
Answer : A

42. A material obeys hooks law up to
A. Plastic limit
B. Elastic limit
C. Yield point
D. Limit of proportionality
Answer : B

43. 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

44. Which of the following statement is incorrect?
A. The liquid fuels have highr 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

45. 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

46. Coke is produced
A. When coal is first dried and then crushed to a fine powder by pulverising machine
B. From the finely ground coal by moulding under pressure with or without a binding material
C. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
D. By heating wood with a limited supply of air to a temperature not less than 280°C
Answer : C

47. 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

48. The calorific value of gaseous fuel is expressed in
A. kJ
B. kJ/kg
C. kJ/m²
D. kJ/m³
Answer : D

49. When the gas is heated at constant volume, the heat supplied
A. Increases the internal energy of the gas and increases the temperature of the gas
B. Does some external work during expansion
C. Both (A) and (B)
D. None of these
Answer : A

50. The entropy __________ in an irreversible cyclic process.
A. Remains constant
B. Decreases
C. Increases
D. None of these
Answer : C