1000+ Strength of Materials MCQ for IBPS PO [Solved]

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

2. 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

3. When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as
A. Thermodynamic law
B. Thermodynamic process
C. Thermodynamic cycle
D. None of these
Answer : B

4. 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

5. 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

6. 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

7. Which of the following gas has the highest calorific value?
A. Coal gas
B. Producer gas
C. Mond gas
D. Blast furnace gas
Answer : A

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

9. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Thermal stress
Answer : D

10. 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

11. When it is indicated that a member is elastic, it means that when force is applied, it will
A. Not deform
B. Be safest
C. Stretch
D. Not stretch
Answer : C

12. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
A. Top layer
B. Bottom layer
C. Neutral axis
D. Every cross-section
Answer : B

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

14. The fuel mostly used in cement industry and in metallurgical processes is
A. Wood charcoal
B. Bituminous coke
C. Pulverised coal
D. Coke
Answer : C

15. Proof resilience per material is known as
A. Resilience
B. Proof resilience
C. Modulus of resilience
D. Toughness
Answer : C

16. For the beam shown in the below figure, the shear force diagram between A and B is

A. A horizontal line
B. A vertical line
C. An inclined line
D. A parabolic curve
Answer : D

17. Which of the following is a proper sequence?
A. Proportional limit, elastic limit, yielding, failure
B. Elastic limit, proportional limit, yielding, failure
C. Yielding, proportional limit, elastic limit, failure
D. None of the above
Answer : A

18. The energy absorbed in a body, when it is strained within the elastic limits, is known as
A. Strain energy
B. Resilience
C. Proof resilience
D. Modulus of resilience
Answer : A

19. In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : B

20. The materials having same elastic properties in all directions are called
A. Ideal materials
B. Uniform materials
C. Isotropic materials
D. Piratical materials
Answer : C

21. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
A. Specific heat at constant volume
B. Specific heat at constant pressure
C. Kilo Joule
D. None of these
Answer : A

22. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A. Combustion is at constant volume
B. Expansion and compression are isentropic
C. Maximum temperature is higher
D. Heat rejection is lower
Answer : D

23. 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

24. Euler's formula holds good only for
A. Short columns
B. Long columns
C. Both short and long columns
D. Weak columns
Answer : B

25. If the value of n = 0 in the equation pvn = C, then the process is called
A. Constant volume process
B. Adiabatic process
C. Constant pressure process
D. Isothermal process
Answer : C

26. Which of the following has the minimum atomic mass?
A. Oxygen
B. Sulphur
C. Nitrogen
D. Carbon
Answer : D

27. Which is the false statement about true stress strain method?
A. It does not exist
B. It is more sensitive to changes in both metallurgical and mechanical conditions
C. It gives a more accurate picture of the ductility
D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.
Answer : A

28. 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

29. A key is subjected to side pressure as well at shearing forces. These pressures are called
A. Bearing stresses
B. Fatigue stresses
C. Crushing stresses
D. Resultant stresses
Answer : A

30. The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
A. ?Q = T.ds
B. ?Q = T/ds
C. dQ = ds/T
D. None of these
Answer : A

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. The volumetric or molar specific heat at constant pressure is the product of
A. Molecular mass of the gas and the specific heat at constant volume
B. Atomic mass of the gas and the gas constant
C. Molecular mass of the gas and the gas constant
D. None of the above
Answer : D

33. A shaft revolving at ? rad/s transmits torque (T) in Nm. The power developed is
A. T.? watts
B. 2?. T.? watts
C. 2?. T.?/75 watts
D. 2?. T.?/4500 watts
Answer : A

34. 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

35. In an extensive property of a thermodynamic system
A. Extensive heat is transferred
B. Extensive work is done
C. Extensive energy is utilised
D. None of these
Answer : D

36. The change in the unit volume of a material under tension with increase in its Poisson's ratio will
A. Increase
B. Decrease
C. Remain same
D. Increase initially and then decrease
Answer : B

37. The condition for the reversibility of a cycle is
A. The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
B. All the processes, taking place in the cycle of operation, must be extremely slow
C. The working parts of the engine must be friction free
D. All of the above
Answer : D

38. 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

39. 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

40. Within elastic limit, stress is
A. Inversely proportional to strain
B. Directly proportional to strain
C. Square root of strain
D. Equal to strain
Answer : B

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

42. 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

43. 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

44. The atomic mass of oxygen is
A. 12
B. 14
C. 16
D. 32
Answer : C

45. 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

46. Which of the following statement is wrong?
A. The closed cycle gas turbine plants are external combustion plants.
B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.
Answer : B

47. 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

48. The increase in entropy of a system represents
A. Increase in availability of energy
B. Increase in temperature
C. Decrease in pressure
D. Degradation of energy
Answer : D

49. The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.
A. Equal to
B. More than
C. Less than
D. None of these
Answer : B

50. 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