Strength of Materials 1000+ MCQ with answer for SSC JHT

1. 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

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

3. 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

4. In compression test, the fracture in cast iron specimen would occur along
A. The axis of load
B. An oblique plane
C. At right angles to the axis of specimen
D. Would not occur
Answer : B

5. The absolute zero pressure can be attained at a temperature of
A. 0°C
B. 273°C
C. 273 K
D. None of these
Answer : D

6. 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

7. 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

8. Otto cycle is also known as
A. Constant pressure cycle
B. Constant volume cycle
C. Constant temperature cycle
D. Constant temperature and pressure cycle
Answer : B

9. Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.
A. The shaft 'B' has the greater diameter
B. The shaft 'A' has the greater diameter
C. Both are of same diameter
D. None of these
Answer : B

10. A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : C

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

12. 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

13. The efficiency of a gas turbine is given by
A. (Net work output)/(Workdone by the turbine)
B. (Net work output)/(Heat supplied)
C. (Actual temperature drop)/(Isentropic temperature drop)
D. (Isentropic increase in temperature)/(Actual increase in temperature)
Answer : B

14. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : C

15. 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

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

17. The main cause for the irreversibility is
A. Mechanical and fluid friction
B. Unrestricted expansion
C. Heat transfer with a finite temperature difference
D. All of the above
Answer : D

18. The ratio of the largest load in a test to the original cross-sectional area of the test piece is called
A. Elastic limit
B. Yield stress
C. Ultimate stress
D. Breaking stress
Answer : C

19. A double strap butt joint with equal straps is
A. Always in single shear
B. Always in double shear
C. Either in single shear or double shear
D. None of these
Answer : B

20. When a body is subjected to biaxial stress i.e. direct stresses (?_x) and (?_y) in two mutually perpendicular planes accompanied by a simple shear stress (?_xy), then maximum normal stress is
A. (?_x + ?_y)/2 + (1/2) × ?[(?_x - ?_y)² + 4 ?²_xy]
B. (?_x + ?_y)/2 - (1/2) × ?[(?_x - ?_y)² + 4 ?²_xy]
C. (?_x - ?_y)/2 + (1/2) × ?[(?_x + ?_y)² + 4 ?²_xy]
D. (?_x - ?_y)/2 - (1/2) × ?[(?_x + ?_y)² + 4 ?²_xy]
Answer : A

21. When the gas is cooled at constant pressure,
A. Its temperature increases but volume decreases
B. Its volume increases but temperature decreases
C. Both temperature and volume increases
D. Both temperature and volume decreases
Answer : D

22. 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

23. 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

24. 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

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

26. Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kinetic theory of gases
Answer : B

27. 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

28. The property of a material which allows it to be drawn into a smaller section is called
A. Plasticity
B. Ductility
C. Elasticity
D. Malleability
Answer : B

29. The heating of a gas at constant pressure is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : B

30. The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C

31. The buckling load for a given column depends upon
A. Area of cross-section of the column
B. Length and least radius of gyration of the column
C. Modulus of elasticity for the material of the column
D. All of the above
Answer : D

32. For a simply supported beam of length l, when a concentrated load W is applied in the centre of the beam, the maximum deflection is
A. 5WL³/ 384EI
B. WL³/384EI
C. WL³/ 348EI
D. WL³/ 48EI
Answer : D

33. 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

34. 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

35. A cantilever beam is one which is
A. Fixed at both ends
B. Fixed at one end and free at the other end
C. Supported at its ends
D. Supported on more than two supports
Answer : B

36. Principal planes are planes having
A. Maximum shear stress
B. No shear stress
C. Minimum shear stress
D. None of the above
Answer : B

37. 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

38. 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

39. Shear stress induced in a shaft subjected to tension will be
A. Maximum at periphery and zero at center
B. Maximum at center
C. Uniform throughout
D. None of the above
Answer : D

40. Modular ratio of two materials is the ratio of
A. Strains
B. Stress and strain
C. Shear stress and shear strain
D. Moduli and elasticity
Answer : D

41. 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

42. A riveted joint in whih the number otrivets decrease from innermost to outer most rows is called
A. Chain riveted joint
B. Diamond riveted joint
C. Crisscross riveted joint
D. Zigzag riveted joint
Answer : B

43. 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

44. The behaviour of super-heated vapour is similar to that of
A. Perfect gas
B. Air
C. Steam
D. Ordinary gas
Answer : A

45. 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

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

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. 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

49. 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

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