Thermodynamics MCQ for SSC JE: Notes and Questions

Thermodynamics Questions for SSC JE PDF

Mechanical Engineering Aspirants preparing for the SSC JE exam and looking for the most important questions of thermodynamics can download the 100 most important questions of thermodynamics pdf and can practice the questions and check their preparedness for SSC JE Exam:

100 Most Important Thermodynamics Questions PDF for SSC JE

Candidates can practice the following questions to get an idea of the difficulty level of the question that is asked in the SSC JE Paper-1 exam.

1. In free expansion process _________.

A. W_1-2= 0
B. Q_1-2 = 0
C. dU = 0
D. All of the above

Answer ||| D

Solution ||| Free expansion:

• In a free expansion, gas is allowed to expand into a vacuum. This happens so quickly, that there is no heat transferred in the process.
• No work is done, because the gas does not work against anything.
• According to the first law, this means that: dU = 0. Thus, there is no change in internal energy, so the temperature also stays the same.

2. For a system of an ideal gas, in a reversible isothermal process, the heat transferred to the system is 0.75 kJ. The internal energy at the initial point is 2.05 kJ. Determine the work done during the process.

A. -1.3 kJ
B. 0.75 kJ
C. -0.75 kJ
D. 2.8 kJ

Answer ||| B

Solution ||| Given:
Heat: Q = 0.75 kJ
For an ideal gas:
U_a = U_b ⇒ dU = 0 (Isothermal process)
Therefore the work done: 
Q = U_b – U_a + W
0.75 = 0 + W
W = 0.75 kJ

3. Which Thermodynamics law predicts correctly, the feasibility/directionality of the process __________?

A. Zeroth law
B. First law
C. Second law
D. Third law

Answer ||| C

Solution ||| The direction of any process is governed by the entropy value which is defined in the Second law of thermodynamics.
Thus, the Second law of thermodynamics provides the direction of possible energy conversion through the concept of entropy.

4. Which of the following is not high-grade energy?

A. Mechanical work
B. Water power
C. Tidal power
D. Heat is derived from nuclear fission or fusion.

Answer ||| D

Solution ||| High grade energy:
Mechanical Work, Electrical Energy, Water Power, Wind Power, Kinetic Energy of a jet, Tidal Power.
Low-grade energy:
Heat or thermal energy, Heat derived from nuclear fission or fusion, Heat derived from combustion of fossil fuels.
So, option (d) is not high-grade energy.

5. On a U-V diagram, triple point is a _________.

A. a point
B. a line
C. a triangle
D. not present

Answer ||| C

Solution ||| Triple point:

• The “triple point” is the point at which the liquid, solid, and vapor phases can exist together.
• On P‐V or T‐V diagrams, these triple‐phase states form a line called the triple line.
• On P-T diagram, triple point is a point.
• On U-V diagram, it is a triangle.

Thermodynamics Notes for SSC JE PDF

We have provided the effective & most reliable thermodynamics Notes below. Aspirants can study these notes as last-minute revision notes as well since they have been prepared in a segregated manner which is important to clear thermodynamics concepts. Good SSC JE Study Material plays an important role in your SSC JE exam preparation as it will help you to grasp the concepts quickly and aspirants can easily tackle thermodynamics questions in SSC JE Exam. 

Candidates must also practice SSC JE Previous Year Question Papers as it gives you an idea about the trend of the questions asked in the SSC JE Exam and what is their difficulty level. Mechanical Engineering Aspirants who are looking for Important formula notes of thermodynamics can download the thermodynamics notes pdf for SSC JE Exam from the direct link given below:

Download Thermodynamics Notes for SSC JE PDF

Thermodynamics Syllabus for SSC JE

The SSC JE Thermodynamics Syllabus includes the following topics mentioned below in the table.

SSC JE Thermodynamics Topic
1st Law of Thermodynamics	2nd Law of Thermodynamics
Definition of Stored Energy & Internal Energy	Definition of Sink
1st Law of Thermodynamics of Cyclic Process	Source Reservoir of Heat
Non Flow Energy Equation	Heat Engine
Flow Energy & Definition of Enthalpy	Heat Pump & Refrigerator
Conditions For Steady State Steady Flow	Thermal Efficiency of Heat Engines & Co-Efficient of Performance of Refrigerators
Steady State Steady Flow Energy Equation	Kelvin – Planck & Clausius Statements of 2nd Law of Thermodynamics
Absolute or Thermodynamic Scale of Temperature	Clausius Integral
Entropy	Entropy Change Calculation of Ideal Gas Processes
Carnot Cycle & Carnot Efficiency	Pmm-2; Definition & Its Impossibility

Read here: SSC JE Mechanical Syllabus

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