Strength of Materials 1000+ MCQ with answer for ESIC

1. 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

2. The point of contraflexure is a point where
A. Shear force changes sign
B. Bending moment changes sign
C. Shear force is maximum
D. Bending moment is maximum
Answer : B

3. Kelvin-Planck's law deals with
A. Conservation of work
B. Conservation of heat
C. Conversion of heat into work
D. Conversion of work into heat
Answer : C

4. A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
A. Same
B. Lower
C. Higher
D. None of these
Answer : C

5. A hollow shaft of same cross-section area as compared to a solid shaft transmit
A. Same torque
B. Less torque
C. More torque
D. Unpredictable
Answer : C

6. 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

7. Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the un-punched plate in
A. Tension
B. Compression
C. Bearing
D. Any one of the above
Answer : A

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

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

10. When both ends of a column are fixed, the effective length is
A. Its own length
B. Twice its length
C. Half its length
D. 1/?2 × its length
Answer : C

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

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

13. 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

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

15. Diesel cycle consists of following four processes
A. Two isothermal 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 : C

16. 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

17. 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

18. The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is
A. L = l/2
B. L = l/?2
C. L = l
D. L = 2l
Answer : A

19. 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

20. 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

21. 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

22. If a part is constrained to move and heated, it will develop
A. Principal stress
B.C. Compressive stress
D. Shear stress
Answer : C

23. According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.
A. Equal to
B. Directly proportional to
C. Inversely proportional to
D. None of these
Answer : B

24. 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

25. For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : B

26. The materials which exhibit the same elastic properties in all directions are called
A. Homogeneous
B. Inelastic
C. Isotropic
D. Isentropic
Answer : C

27. According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
A. First kind
B. Second kind
C. Third kind
D. None of these
Answer : B

28. Reversed joule cycle is called
A. Carnot cycle
B. Rankine cycle
C. Brayton cycle
D. Bell Coleman cycle
Answer : C

29. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
A. Of same magnitude as that of bar and applied at the lower end
B. Half the weight of bar applied at lower end
C. Half of the square of weight of bar applied at lower end
D. One fourth of weight of bar applied at lower end
Answer : B

30. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
A. Less than
B. Equal to
C. More than
D. None of these
Answer : C

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

32. 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

33. The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of
A. One right angled triangle
B. Two right angled triangles
C. One equilateral triangle
D. Two equilateral triangles
Answer : B

34. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
A. Tensile
B. Compressive
C. Shear
D. Zero
Answer : B

35. When a gas is heated at constant volume
A. Its temperature will increase
B. Its pressure will increase
C. Both temperature and pressure will increase
D. Neither temperature nor pressure will increase
Answer : C

36. The bending moment at a point on a beam is the algebraic ________ of all the moments on either side of the point.
A. Sum
B. Difference
C. Multiplication
D. None of the above
Answer : A

37. One kilowatt is equal to
A. 1 N-m/s
B. 100 N-m
C. 1000 N-m/s
D. 1 × 10⁶ N-m/s
Answer : C

38. The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : A

39. Carnot cycle has maximum efficiency for
A. Petrol engine
B. Diesel engine
C. Reversible engine
D. Irreversible engine
Answer : C

40. The moment of resistance of a balanced reinforced concrete beam is based on the stresses in
A. Steel only
B. Concrete only
C. Steel and concrete both
D. None of these
Answer : C

41. 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

42. 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

43. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
A. 30 kJ
B. 54 kJ
C. 84 kJ
D. 114 kJ
Answer : B

44. Workdone in a free expansion process is
A. Zero
B. Minimum
C. Maximum
D. Positive
Answer : A

45. 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

46. A composite shaft consisting of two stepped portions having spring constants K? and K? is held between two rigid supports at the ends. Its equivalent spring constant is
A. K? K?
B. (K? + K?)/ 2
C. (K? + K?)/ K? K?
D. K? K?/ (K? + K?)
Answer : A

47. The entropy may be expressed as a function of
A. Pressure and temperature
B. Temperature and volume
C. Heat and work
D. All of these
Answer : A

48. The compression ratio for petrol engines is
A. 3 to 6
B. 5 to 8
C. 10 to 20
D. 15 to 30
Answer : B

49. 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

50. A fletched beam is used to
A. Change the shape of the beam
B. Effect the saving in material
C. Equalise the strength in tension and compression
D. Increase the cross-section of the beam
Answer : C