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

1. 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

2. The hyperbolic process is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A

3. 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

4. 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

5. 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

6. 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

7. The value of one bar (in S. I. units) is equal to
A. 1 × 10² N/m²
B. 1 × 10³ N/m²
C. 1 × 10⁴ N/m²
D. 1 × 10⁵ N/m²
Answer : D

8. 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

9. 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

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

11. 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

12. 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

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

14. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as
A. Law of equipartition of energy
B. Law of conservation of energy
C. Law of degradation of energy
D. None of these
Answer : A

15. When a gas is heated, change takes place in
A. Pressure
B. Volume
C. Temperature
D. All of these
Answer : D

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

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

18. The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
Answer : B

19. If a material expands freely due to heating it will develop
A. Thermal stresses
B. Tensile stress
C. Bending
D. No stress
Answer : D

20. 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

21. The bending stress in a beam is _________ section modulus.
A. Inversely proportional to two times
B. Directly proportional to
C. Inversely proportional to
D. None of these
Answer : C

22. 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

23. The following cycle is used for air craft refrigeration
A. Brayton cycle
B. Joule cycle
C. Carnot cycle
D. Reversed Brayton cycle
Answer : D

24. 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

25. For the same compression ratio, the efficiency of dual combustion cycle is
A. Greater than Diesel cycle and less than Otto cycle
B. Less than Diesel cycle and greater than Otto cycle
C. Greater than Diesel cycle
D. Less than Diesel cycle
Answer : A

26. A cycle consisting of two isothermal and two isentropic processes, is known as
A. Carnot cycle
B. Stirling cycle
C. Ericsson cycle
D. Joule cycle
Answer : A

27. A cylindrical section having no joint is known as
A. Joint less section
B. Homogeneous section
C. Perfect section
D. Seamless section
Answer : D

28. 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

29. 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

30. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
A. t
B. 2t
C. 4t
D. 8t
Answer : C

31. 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

32. 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

33. Which of the following is the extensive property of a thermodynamic system?
A. Pressure
B. Volume
C. Temperature
D. Density
Answer : B

34. The distance between the centres of the rivets in adjacent rows of zigzag riveted joint is known as
A. Pitch
B. Back pitch
C. Diagonal pitch
D. Diametric pitch
Answer : C

35. 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

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

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

38. The maximum bending moment for the beam shown in the below figure, is

A. wl²/3?3
B. wl²/6?3
C. wl²/9?3
D. wl²/12?3
Answer : C

39. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
A. Workdone
B. Entropy
C. Enthalpy
D. None of these
Answer : C

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

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

42. The efficiency of a Carnot engine depends on
A. Working substance
B. Design of engine
C. Size of engine
D. Temperatures of source and sink
Answer : D

43. The deformation per unit length is called
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Strain
Answer : D

44. The stress necessary to initiate yielding is
A. Considerably greater than that necessary to continue it
B. Considerably lesser than that necessary to continue it
C. Greater than that necessary to stop it
D. Lesser than that necessary to stop it
Answer : A

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

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

47. The process is adiabatic, if the value of n in the equation pvn = C, is
A. 0
B. 1
C. ?
D. ?
Answer : C

48. A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce
A. No stress
B. Shear stress
C. Tensile stress
D. Compressive stress
Answer : A

49. The heat supplied to the gas at constant volume is (where m = Mass of gas, c_v = Specific heat at constant volume, c_p = Specific heat at constant pressure, T₂ - T₁ = Rise in temperature, and R = Gas constant)
A. mR (T₂ - T₁)
B. mc_v (T₂ - T₁)
C. mc_p (T₂ - T₁)
D. mc_p (T₂ + T₁)
Answer : B

50. 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