Thermodynamics Practice Questions
JEE · Physics · 1704 free MCQs with instant results and detailed explanations.
1704
Total
414
Easy
775
Medium
515
Hard
Start Practicing Thermodynamics
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Topics in Thermodynamics
Laws of Thermodynamics
116
Kinetic Theory of Gases
103
Heat Transfer
204
Zeroth Law
146
First Law
167
Work Done by Gas
182
Thermodynamic Processes
220
Carnot Engine
165
Second Law
178
Entropy
223
Sample Questions from Thermodynamics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the primary mode of heat transfer in fluids?
A.
Conduction
B.
Radiation
C.
Convection
D.
Insulation
Show Answer & Explanation
Correct Answer: C
In fluids, heat is primarily transferred through convection, where warmer fluid rises and cooler fluid sinks, creating a current.
Q2
Easy
Which of the following materials is a poor conductor of heat?
A.
Copper
B.
Aluminum
C.
Wood
D.
Iron
Show Answer & Explanation
Correct Answer: C
Wood is a poor conductor of heat compared to metals like copper and aluminum, which are good conductors.
Q3
Easy
If you double the temperature of a substance in Kelvin, what happens to the heat content assuming constant pressure?
A.
It doubles
B.
It triples
C.
It quadruples
D.
It stays the same
Show Answer & Explanation
Correct Answer: C
At constant pressure, the heat content of an ideal gas is directly proportional to its absolute temperature in Kelvin.
Q4
Medium
Which of the following statements best describes the First Law of Thermodynamics?
A.
Energy can neither be created nor destroyed, only transformed.
B.
The temperature of a system is always constant in any process.
C.
Only heat can be converted into work, not vice versa.
D.
Work done on a system is independent of heat transfer.
Show Answer & Explanation
Correct Answer: A
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another.
Q5
Medium
A gas expands isothermally from volume V1 to V2 at temperature T. What is the work done by the gas?
A.
nRT ln(V2/V1)
B.
nR(T2 - T1)
C.
P(V2 - V1)
D.
nC_v(T2 - T1)
Show Answer & Explanation
Correct Answer: A
For an isothermal process, the work done is given by W = nRT ln(V2/V1).
Q6
Medium
In an adiabatic process, which of the following is true regarding the heat transfer?
A.
Heat is absorbed from the surroundings.
B.
Heat is released to the surroundings.
C.
No heat is exchanged with the surroundings.
D.
Heat transfer is always zero only if pressure is constant.
Show Answer & Explanation
Correct Answer: C
An adiabatic process is defined by the absence of heat transfer—no heat is exchanged with the surroundings.
Q7
Medium
A gas is compressed in a piston-cylinder arrangement. If the initial pressure is P1 and the final pressure is P2, what can be said about the work done on the gas?
A.
It is always positive.
B.
It is always negative.
C.
It depends on the path taken.
D.
It cannot be determined without temperature data.
Show Answer & Explanation
Correct Answer: C
The work done on or by a gas depends on the specific process path taken during compression or expansion.
Q8
Hard
A metal rod is heated at one end. If the temperature at the heated end is maintained at 100°C and the other end is insulated, what will be the temperature gradient along the rod assuming steady-state conduction?
A.
Linear gradient towards insulated end
B.
Exponential decrease towards insulated end
C.
Constant temperature throughout
D.
Gradually increasing towards insulated end
Show Answer & Explanation
Correct Answer: A
In steady-state conduction, the temperature distribution in a rod with one end heated and the other insulated forms a linear gradient.
Q9
Hard
Two surfaces, one at 500 K and one at 300 K, exchange heat. If they are separated by a distance of 0.1 m and the thermal conductivity of the medium between them is 0.2 W/m·K, what is the rate of heat transfer?
A.
20 W
B.
30 W
C.
5 W
D.
10 W
Show Answer & Explanation
Correct Answer: D
Using Fourier's law of heat conduction, the heat transfer can be calculated as Q = kA(T1-T2)/d.
Q10
Hard
Which of the following statements about convection is true?
A.
Convection can only occur in liquids.
B.
Natural convection occurs due to buoyancy forces.
C.
Convection does not transfer heat in gases.
D.
All convection processes are forced.
Show Answer & Explanation
Correct Answer: B
Natural convection is driven by density differences caused by temperature variations, leading to buoyancy forces.
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Thermodynamics — JEE Physics Practice Questions Online
This page contains 1704 practice MCQs for the chapter Thermodynamics in JEE Physics. The questions are organized by difficulty — 414 easy, 775 medium, 515 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 10 topics, giving you comprehensive coverage of the entire chapter.