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Thermodynamics Objective Type MCQs are very important for semester exams, campus placement test, job interviews and competitive exams like GATE, IES, PSU, NET, SET, JRF etc. Thermodynamics Questions And Answers are provided on this page for assistance of applicants who are preparing for competitive and other exams. You can download Thermodynamics Practice Test Questions And Answers PDF through this page.

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Question 1: The energy of an isolated system

1. is always decreasing
2. is always constant
3. is always increasing
4. none of the above

Question 2: The thermodynamic work done by the system on the surrounding is considered as ____.

1. positive
2. negative
3. neutral
4. none of the above

Question 3: When the heat transfer into a system is more than the work transfer out of the system, then

1. the internal energy of the system remains constant
2. the internal energy of the system decreases
3. the internal energy of the system increases
4. none of the above

Question 4: Practically heat and work are completely interchangeable forms of energy

1. True
2. False

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Question 5: First law of thermodynamics provides

1. a statement that energy balance occurs when a system undergoes the change of state or the process
2. a statement about whether the change of state or the process is at all feasible or not
3. both a. and b.
4. none of the above

Question 6: Which of the following is NOT the heat engine cycle

1. refrigerator
2. stem power plant
3. mass of gas confined in a cylinder and piston machine
4. none of the above

Question 7: Efficiency of heat engine cycle is the ratio of

1. total heat input to the cycle (Qin) to net work output of the cycle (Wnet)
2. net work output of the cycle (Wnet) to total heat input to the cycle (Qin)
3. net work output of the cycle (Wnet) to heat rejected from the system (Qout)
4. none of the above

Question 8: A thermal energy reservoir (TER) has

1. a finite heat capacity
2. an infinite heat capacity
3. a finite mass
4. none of the above

Question 9: Two reversible adiabatic paths

1. can intersect with each other
2. cannot intersect with each other
3. may intersect or may not intersect
4. none of the above

Question 10: Which property of a system is constant in reversible adiabatic process?

1. pressure
2. volume
3. temperature
4. entropy

Question 11: The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

1. one-half
2. one-third
3. two-third
4. three-fourth

Question 12: The compression ratio for petrol engines is

1. 3 to 6
2. 5 to 8
3. 15 to 20
4. 20 to 30

Question 13: The efficiency of Diesel cycle approaches to Otto cycle efficiency when

1. cut-off is increased
2. cut-off is decreased
3. cut-off is zero
4. cut-off is constant

Question: 14. The entropy __________ in an irreversible cyclic process.

1. remains constant
2. decreases
3. increases

Question 15: The atomic mass of oxygen is

1. 12
2. 14
3. 16
4. 32

Question 16: The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

1. equal to one
2. less than one
3. greater than one
4. none of these

Question 17: Carbonisation of coal consists of

1. drying and crushing the coal to a fine powder
2. moulding the finely ground coal under pressure with or without a binding material
3. heating the wood with a limited supply of air to temperature not less than 280°C
4. none of the above

Question 18: The efficiency of Stirling cycle is __________ Carnot cycle.

1. greater than
2. less than
3. equal to

Question 19: According to Gay-Lussac law for a perfect gas, p/T = constant, if v is kept constant.

1. True
2. False

Question 20: There is no change in internal energy in an isothermal process.

1. Correct
2. Incorrect

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Question 21: If the value of n = 0 in the equation pvn = C, then the process is called

1. constant volume process
3. constant pressure process
4. isothermal process

Question 22: The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

1. less than
2. equal to
3. more than

Question 23: When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.

1. atomisation
2. carbonisation

Question 24: Which of the following is correct?

1. Absolute pressure = Gauge pressure + Atmospheric pressure
2. Gauge pressure = Absolute pressure + Atmospheric pressure
3. Atmospheric pressure = Absolute pressure + Gauge pressure
4. Absolute pressure = Gauge pressure – Atmospheric pressure

Question 25: 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

1. cracking
2. carbonisation
3. fractional distillation
4. full distillation

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Question 26: Which of the following statement is incorrect?

1. The liquid fuels consist of hydrocarbons.
2. The liquid fuels have higher calorific value than solid fuels.
3. The solid fuels have higher calorific value than liquid fuels.
4. A good fuel should have low ignition point.

Question 27: Which of the following gas is mostly used in town for street and domestic lighting and heating?

1. Producer gas
2. Coal gas
3. Mond gas
4. Coke oven gas

Question 28: The efficiency of Diesel cycle increases with

1. decrease in cut-off
2. increase in cut-off
3. constant cut-off
4. none of these

Question 29:

The absolute zero temperature is taken as

1. -273°C
2. 273°C
3. 237°F
4. -237°F

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Question 30: The specific heat of water is

1. 817
2. 2512
3. 187
4. none of these

Thermodynamics Objective Type Questions with Answers:

Thermodynamics is a branch of physics concerned with heat and temperature and their relation to energy and work. Here, we are providing Thermodynamics Test Questions And Answers through which students may practice and improve their skills.

Those who are preparing for any engineering competition exam, they must learn Thermodynamics topic also. In any engineering competition test, there will be some Thermodynamics MCQs ask in exam.