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

Thursday 9th of March 2023

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1. 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
2. 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
3. The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the fixed end.
A. wl/4
B. wl/2
C. wl
D. wl²/2
Answer : D
4. 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
5. 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
6. First law of thermodynamics deals with
A. Conservation of heat
B. Conservation of momentum
C. Conservation of mass
D. Conservation of energy
Answer : D
7. The heat and mechanical energies are mutually convertible. This statement was established by
A. Boyle
B. Charles
C. Joule
D. None of these
Answer : C
8. An open cycle gas turbine works on
A. Carnot cycle
B. Otto cycle
C. Joule's cycle
D. Stirling cycle
Answer : C
9. Resilience of a material is considered when it is subjected to
A. Frequent heat treatment
B. Fatigue
C. Creep
D. Shock loading
Answer : D
10. The entropy may be expressed as a function of
A. Pressure and temperature
B. Temperature and volume
C. Heat and work
D. All of these
Answer : A
11. 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
12. The mass of excess air supplied is equal to
A. (23/100) × Mass of excess carbon
B. (23/100) × Mass of excess oxygen
C. (100/23) × Mass of excess carbon
D. (100/23) × Mass of excess oxygen
Answer : D
13. 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
14. The efficiency of Diesel cycle depends upon
A. Temperature limits
B. Pressure ratio
C. Compression ratio
D. Cut-off ratio and compression ratio
Answer : D
15. The strain energy stored in a solid circular shaft 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 : A
16. 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
17. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
A. Cut-off is increased
B. Cut-off is decreased
C. Cut-off is zero
D. Cut-off is constant
Answer : C
18. A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to
A. wl/6
B. wl/3
C. wl
D. 2wl/3
Answer : A
19. 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
20. In a uniform bar, supported at one end in position, the maximum stress under self weight of bar shall occur at the
A. Middle of bar
B. Supported end
C. Bottom end
D. None of these
Answer : B
21. A masonry dam may fail due to
A. Tension in the masonry of the dam and its base
B. Overturning of the dam
C. Crushing of masonry at the base of the dam
D. Any one of the above
Answer : D
22. For which material the Poisson' ratio is more than unity
A. Steel
B. Copper
C. Aluminium
D. None of the above
Answer : D
23. The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.
A. Greater than
B. Less than
C. Equal to
D. None of these
Answer : A
24. The torsional rigidity of a shaft is expressed by the
A. Maximum torque it can transmit
B. Number of cycles it undergoes before failure
C. Elastic limit up to which it resists torsion, shear and bending stresses
D. Torque required to produce a twist of one radian per unit length of shaft
Answer : D
25. The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is
A. 23.97 bar
B. 25 bar
C. 26.03 bar
D. 34.81 bar
Answer : C
26. 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
27. 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
28. 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
29. Stirling cycle consists of
A. Two constant volume and two isentropic processes
B. Two constant volume and two isothermal processes
C. Two constant pressure and two isothermal processes
D. One constant volume, one constant pressure and two isentropic processes
Answer : B
30. Strain is equal to (where l = Original length, and ?l = Change in length)
A. l/?l
B. ?l/l
C. l.?l
D. l + ?l
Answer : B
31. 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
32. 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
33. 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
34. 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
35. 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
36. Formula based on IS codes is based on
A. Straight line formula
B. Eulers formula
C. Rankines formula
D. Secant formula
Answer : D
37. Which of the following cycles is not a reversible cycle?
A. Carnot
B. Ericsson
C. Stirling
D. None of the above
Answer : D
38. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
A. Of same magnitude as that of bar and applied at the lower end
B. Half the weight of bar applied at lower end
C. Half of the square of weight of bar applied at lower end
D. One fourth of weight of bar applied at lower end
Answer : B
39. 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
40. Diamond riveted joint can be adopted in the case of following type of joint
A. Butt joint
B. Lap joint
C. Double riveted lap joints
D. All types of joints
Answer : A
41. 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
42. The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
Answer : B
43. A pressure vessel is said to be a thick shell, when
A. It is made of thick sheets
B. The internal pressure is very high
C. The ratio of wall thickness of the vessel to its diameter is less than 1/10.
D. The ratio of wall thickness of the vessel to its diameter is greater than 1/10.
Answer : D
44. 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
45. Coke is produced
A. When coal is first dried and then crushed to a fine powder by pulverising machine
B. From the finely ground coal by moulding under pressure with or without a binding material
C. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
D. By heating wood with a limited supply of air to a temperature not less than 280°C
Answer : C
46. In a tensile test, near the elastic limit zone, the
A. Tensile strain increases more quickly
B. Tensile strain decreases more quickly
C. Tensile strain increases in proportion to the stress
D. Tensile strain decreases in proportion to the stress
Answer : A
47. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
A. Less than
B. Equal to
C. More than
D. None of these
Answer : C
48. A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.
A. Two constant pressure
B. Two constant volume
C. Two isentropic
D. One constant pressure, one constant volume
Answer : B
49. The columns whose slenderness ratio is less than 80, are known as
A. Short columns
B. Long columns
C. Weak columns
D. Medium columns
Answer : A
50. The ratio of molar specific heats for mono-atomic gas is
A. 1
B. 1.4
C. 1.67
D. 1.87
Answer : C
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