1000+ Strength of Materials MCQ for CTET [Solved]

1. 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

2. 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

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

4. 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

5. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as
A. Isothermal process
B. Adiabatic process
C. Free expansion process
D. Throttling process
Answer : D

6. 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

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

8. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, then
A. The stress and strain induced is compressive
B. The stress and strain induced is tensile
C. Both A and B is correct
D. None of these
Answer : A

9. Which of the following gas has a minimum molecular mass?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Methane
Answer : C

10. When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
A. Zero
B. 1/5
C. 4/5
D. 1
Answer : A

11. In open cycle gas turbine plants
A. The indirect heat exchanger and cooler is avoided
B. Direct combustion system is used
C. A condenser is used
D. All of the above
Answer : D

12. 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

13. 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

14. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)
A. R_u × T
B. 1.5 R_u × T
C. 2 R_u × T
D. 3 R_u × T
Answer : B

15. The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
A. More than 50 %
B. 25-50 %
C. 10-25 %
D. Negligible
Answer : D

16. 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

17. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
A. Dual combustion cycle
B. Diesel cycle
C. Atkinson cycle
D. Rankine cycle
Answer : C

18. A molecule consisting of one atom is known as
A. Mono-atomic
B. Di-atomic
C. Tri-atomic
D. Poly-atomic
Answer : A

19. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
A. Flow processes
B. Non-flow processes
C. Adiabatic processes
D. None of these
Answer : A

20. The fuel mostly used in blast furnace for extracting pig iron from iron ores is
A. Hard coke
B. Soft coke
C. Pulverised coal
D. Bituminous coal
Answer : A

21. The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
A. 0.224 litres
B. 2.24 litres
C. 22.4 litres
D. 224 litres
Answer : C

22. 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

23. For same compression ratio and for same heat added
A. Otto cycle is more efficient than Diesel cycle
B. Diesel cycle is more efficient than Otto cycle
C. Efficiency depends on other factors
D. Both Otto and Diesel cycles are equally efficient
Answer : A

24. The lower layer 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 : A

25. 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

26. A beam is loaded as cantilever. If the load at the end is increased, the failure will occur
A. In the middle
B. At the tip below the load
C. At the support
D. Anywhere
Answer : D

27. An isothermal process is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A

28. 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

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

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. Mond gas is obtained by
A. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
B. Carbonisation of bituminous coal
C. Passing steam over incandescent coke
D. Passing air and a large amount of steam over waste coal at about 650°C
Answer : D

32. 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

33. 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

34. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
A. 30 kJ
B. 54 kJ
C. 84 kJ
D. 114 kJ
Answer : B

35. 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

36. 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

37. A material obeys hooks law up to
A. Plastic limit
B. Elastic limit
C. Yield point
D. Limit of proportionality
Answer : B

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

39. 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

40. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m, and then the hoop stress will be
A. 30 MN/m²
B. 50 MN/m²
C. 100 MN/m²
D. 200 MN/m²
Answer : C

41. True stress strain-curve for materials is plotted between
A. Load/original cross-sectional area and change in length/original length
B. Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)
C. Load/ instantaneous cross-sectional area and change in length/ original length
D. Load/ instantaneous area and instantaneous area/original area
Answer : B

42. 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