# Thermodynamics MCQ for SSC JE: Notes and Questions

By BYJU'S Exam Prep

Updated on: October 17th, 2023

Thermodynamics is one of the important subjects of mechanical engineering that carries a good weightage in the SSC JE Tier-1 exam. With the help of the previous year’s SSC JE paper-1 analysis, it came to know that at least 8-12 questions come from thermodynamics in the paper-1 exam. Hence it is important for all the aspirants to practice as many thermodynamics mcq for the SSC JE as they can to score well in the SSC JE Tier-1 examination and also refer to good thermodynamics notes for SSC JE to clear the concept of that subject so that you easily tackle the thermodynamics questions in the SSC JE exam.

The mechanical engineering candidates who are searching for the best thermodynamics notes for SSC JE can download them from here. The given thermodynamics notes for SSC JE will help you in resolving a number of queries related to exam preparation according to the SSC JE syllabus.

Table of content

## 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. W1-2= 0
B. Q1-2 = 0
C. dU = 0
D. All of the above

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

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

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.

Mechanical Work, Electrical Energy, Water Power, Wind Power, Kinetic Energy of a jet, Tidal Power.
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

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:

## 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