1000+ Strength of Materials Multiple Choice Question Answer [Solved]

1. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
A. Isothermal process
B. Hyperbolic process
C. Adiabatic process
D. Polytropic process
Answer : A

2. Slenderness of a column is zero when
A. Ends are firmly fixed
B. Column is supported on all sides throughout the length
C. Length is equal to radius of gyration
D. Length is twice the radius of gyration
Answer : D

3. High air-fuel ratio in gas turbines
A. Increases power output
B. Improves thermal efficiency
C. Reduces exhaust temperature
D. Do not damage turbine blades
Answer : C

4. 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

5. 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

6. 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

7. 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

8. The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by
A. E = 3K.C/(3K + C)
B. E = 6K.C/(3K + C)
C. E = 9K.C/(3K + C)
D. E = 12K.C/(3K + C)
Answer : C

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

10. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
A. Dual cycle, Diesel cycle, Otto cycle
B. Otto cycle, Diesel cycle, Dual cycle
C. Dual cycle, Otto cycle, Diesel cycle
D. Diesel cycle, Otto cycle, Dual cycle
Answer : A

11. Which of the following gas is mostly used in town for street and domestic lighting and heating?
A. Producer gas
B. Coal gas
C. Mond gas
D. Coke oven gas
Answer : B

12. The value of 1 mm of Hg is equal to
A. 1.333 N/m²
B. 13.33 N/m²
C. 133.3 N/m²
D. 1333 N/m²
Answer : C

13. For which material the Poisson's ratio is more than unity
A. Steel
B. Copper
C. Aluminium
D. None of the above
Answer : D

14. The principal constituents of a fuel are
A. Carbon and hydrogen
B. Oxygen and hydrogen
C. Sulphur and oxygen
D. Sulphur and hydrogen
Answer : A

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

16. Workdone during adiabatic expansion is given by (where p₁ v₁, T₁ = Pressure, volume and temperature for the initial condition of gas, p_2, v₂, T₂ = Corresponding values for the final condition of gas, R = Gas constant, and ? = Ratio of specific heats)
A. (p₁ v₁ - p₂ v₂)/(? - 1)
B. [m R (T₁ - T₂)] /(? - 1)
C. [m R T₁/(? - 1)][1 - (p₂ v₂ /p₁ v₁)]
D. All of these
Answer : D

17. The ratio of lateral strain to the linear strain within elastic limit is known as
A. Young's modulus
B. Bulk modulus
C. Modulus of rigidity
D. Poisson's ratio
Answer : D

18. When a body is subjected to a direct tensile stress (?) in one plane, then maximum normal stress occurs at a section inclined at __________ to the normal of the section.
A. 0°
B. 30°
C. 45°
D. 90°
Answer : A

19. 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

20. Which of the following materials is most elastic?
A. Rubber
B. Plastic
C. Brass
D. Steel
Answer : D

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

22. The pressure exerted by an ideal gas is ________ of the kinetic energy of all the molecules contained in a unit volume of gas.
A. One-half
B. One-third
C. Two-third
D. Three-fourth
Answer : C

23. Resilience of a material is considered when it is subjected to
A. Frequent heat treatment
B. Fatigue
C. Creep
D. Shock loading
Answer : D

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

25. According to Avogadro's law
A. The product of the gas constant and the molecular mass of an ideal gas is constant
B. The sum of partial pressure of the mixture of two gases is sum of the two
C. Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
D. All of the above
Answer : C

26. Impact strength of a material is an index of its
A. Toughness
B. Tensile strength
C. Capability of being cold worked
D. Hardness
Answer : A

27. If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to
A. Bending moment (i.e. M)
B. Bending moment² (i.e. M²)
C. Bending moment³ (i.e. M³)
D. Bending moment? (i.e. M?)
Answer : A

28. Which of the following is the correct statement?
A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.
Answer : C

29. When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ?? = Hoop strain, and ?? = Longitudinal strain)
A. 2?? - ??
B. 2?? + ??
C. 2?? - ??
D. 2?? + ??
Answer : B

30. 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

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

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

33. Which of the following is an intensive property of a thermodynamic system?
A. Volume
B. Temperature
C. Mass
D. Energy
Answer : B

34. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
A. 0.086
B. 1.086
C. 1.086
D. 4.086
Answer : B

35. Which of the following statement is wrong?
A. The deformation of the bar per unit length in the direction of the force is called linear strain.
B. The Poisson's ratio is the ratio of lateral strain to the linear strain.
C. The ratio of change in volume to the original volume is called volumetric strain.
D. The bulk modulus is the ratio of linear stress to the linear strain.
Answer : D

36. 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

37. 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

38. 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

39. 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

40. The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and ?t = Allowable tensile stress for weld metal)
A. 0.5 s.l.?_t
B. s.l.?_t
C. ?2 s.l.?_t
D. 2.s.l.?t
Answer : C

41. A definite area or a space where some thermodynamic process takes place is known as
A. Thermodynamic system
B. Thermodynamic cycle
C. Thermodynamic process
D. Thermodynamic law
Answer : A

42. 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

43. A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
A. -140 kJ
B. -80 kJ
C. -40 kJ
D. +60 kJ
Answer : D

44. Which of the following has the highest calorific value?
A. Peat
B. Lignite
C. Bituminous coal
D. Anthracite coal
Answer : D

45. 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

46. One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A. 11/7
B. 9/7
C. 4/7
D. All of the above
Answer : C

47. The temperature at which the volume of a gas becomes zero is called
A. Absolute scale of temperature
B. Absolute zero temperature
C. Absolute temperature
D. None of these
Answer : B

48. 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

49. The strain energy stored in a solid circular shaft in torsion, subjected to shear stress (?), is: (Where, G = Modulus of rigidity for the shaft material)
A. ?²/ 2G × Volume of shaft
B. ?/ 2G × Volume of shaft
C. ?²/ 4G × Volume of shaft
D. ?/ 4G × Volume of shaft
Answer : C

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