IBPS Clerk - Strength of Materials 1000+ MCQ [Solved] PDF Download

1. The value of cp/cv for air is
A. 1
B. 1.4
C. 1.45
D. 2.3
Answer : B

2. The stress at which extension of the material takes place more quickly as compared to the increase in load is called
A. Elastic point of the material
B. Plastic point of the material
C. Breaking point of the material
D. Yielding point of the material
Answer : D

3. The fuel mostly used in steam boilers is
A. Brown coal
B. Peat
C. Coking bituminous coal
D. Non-coking bituminous coal
Answer : D

4. The entropy of water at 0°C is assumed to be
A. 1
B. 0
C. -1
D. 10
Answer : B

5. If in the equation pvn = C, the value of n = ?, then the process is called
A. Constant volume process
B. Adiabatic process
C. Constant pressure process
D. Isothermal process
Answer : A

6. The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
A. 0.224 litres
B. 2.24 litres
C. 22.4 litres
D. 224 litres
Answer : C

7. 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

8. An adiabatic process is one in which
A. No heat enters or leaves the gas
B. The temperature of the gas changes
C. The change in internal energy is equal to the mechanical workdone
D. All of the above
Answer : D

9. The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is
A. In the vertical plane
B. In the horizontal plane
C. In the same plane in which the beam bends
D. At right angle to the plane in which the beam bends
Answer : D

10. 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

11. 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

12. The fuel mostly used in blast furnace for extracting pig iron from iron ores is
A. Hard coke
B. Soft coke
C. Pulverised coal
D. Bituminous coal
Answer : A

13. The amount of heat generated per kg of fuel is known as
A. Calorific value
B. Heat energy
C. Lower calorific value
D. Higher calorific value
Answer : A

14. 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

15. 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

16. In a free expansion process,
A. W_{1 - 2} = 0
B. Q_{1 - 2} = 0
C. dU = 0
D. All of these
Answer : D

17. 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

18. After reaching the yielding stage while testing a mild steel specimen, strain
A. Becomes constant
B. Starts decreasing
C. Increases without any increase in load
D. None of the above
Answer : C

19. The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to
A. Young's modulus
B. Bulk modulus
C. Modulus of rigidity
D. Modulus of elasticity
Answer : B

20. 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

21. For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)
A. p v = constant, if T is kept constant
B. v/T = constant, if p is kept constant
C. p/T = constant, if v is kept constant
D. T/p = constant, if v is kept constant
Answer : A

22. 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

23. Which of the following is an irreversible cycle?
A. Carnot
B. Stirling
C. Ericsson
D. None of the above
Answer : D

24. 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

25. Select the wrong statement
A. A Joule cycle consists of two constant volume and two isentropic processes.
B. An Otto cycle consists of two constant volume and two isentropic processes.
C. An Ericsson cycle consists of two constant pressure and two isothermal processes.
D. All of the above
Answer : A

26. Which of the following statement is correct?
A. The increase in entropy is obtained from a given quantity of heat at a low temperature.
B. The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.
C. The entropy represents the maximum amount of work obtainable per degree drop in temperature.
D. All of the above
Answer : D

27. The layer at the centre of gravity of the beam as shown in the below figure, will be

A. In tension
B. In compression
C. Neither in tension nor in compression
D. None of these
Answer : C

28. When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
A. Young's modulus
B. Modulus of rigidity
C. Bulk modulus
D. Poisson's ratio
Answer : C

29. When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
A. Equal to
B. Directly proportional to
C. Inversely proportional to
D. Independent of
Answer : B

30. 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

31. 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

32. 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

33. The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C

34. 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

35. One molecule of oxygen is __________ times heavier than the hydrogen atom.
A. 12
B. 14
C. 16
D. 32
Answer : D

36. When a body is subjected to a direct tensile stress (?x) in one plane accompanied by a simple shear stress (?xy), the minimum normal stress is
A. (?_x/2) + (1/2) × ?(?_x² + 4 ?²_xy)
B. (?_x/2) - (1/2) × ?(?_x² + 4 ?²_xy)
C. (?_x/2) + (1/2) × ?(?_x² - 4 ?²_xy)
D. (1/2) × ?(?x² + 4 ?²_xy)
Answer : B

37. A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
A. l/8
B. l/4
C. l/2
D. l
Answer : C

38. 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

39. In a steady flow process, the ratio of
A. Heat transfer is constant
B. Work transfer is constant
C. Mass flow at inlet and outlet is same
D. All of these
Answer : D

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

41. Stirling and Ericsson cycles are
A. Reversible cycles
B. Irreversible cycles
C. Semi-reversible cycles
D. Quasi-static cycles
Answer : A

42. According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
A. Remains constant
B. Increases
C. Decreases
D. None of these
Answer : B

43. For riveting, the size of hole drilled in plates is __________ shank diameter of rivet.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C

44. When two plates are butt together and riveted with cover plates with two rows of rivets, the joint is known as
A. Lap joint
B. Butt joint
C. Single riveted single cover butt joint
D. Double riveted double cover butt joint
Answer : D

45. When shear force at a point is zero, then bending moment is _________ at that point.
A. Zero
B. Minimum
C. Maximum
D. Infinity
Answer : C

46. 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

47. The gas constant (R) is equal to the
A. Sum of two specific heats
B. Difference of two specific heats
C. Product of two specific heats
D. Ratio of two specific heats
Answer : B

48. 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

49. The efficiency of Diesel cycle increases with
A. Decrease in cut-off
B. Increase in cut-off
C. Constant cut-off
D. None of these
Answer : A

50. Which of the following is the correct statement?
A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.
B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.
D. The efficiency of Otto or Diesel cycle has nothing to do with compression ratio.
Answer : B