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Previous year question hub

Heat And Thermodynamics - Mechanics - Physics Previous Year Questions

Practice Heat And Thermodynamics - Mechanics - Physics previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

5Papers
5Years
7Questions
1Topics

Heat And Thermodynamics question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Heat And Thermodynamics. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Not classified 7 100%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

Multiple Choices 7 100%

Subject weightage

Top subjects by unique question coverage.

Physics
7 Qs

Most asked topics

Top topics across the included previous year papers.

Mechanics
7 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Heat And Thermodynamics
7 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

IAT IISER 2025
1 Qs
IAT IISER 2024
2 Qs
IAT IISER 2023
1 Qs
IAT IISER 2022
1 Qs
IAT IISER 2020
2 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
IAT IISER 202520251View paper
IAT IISER 202420242View paper
IAT IISER 202320231View paper
IAT IISER 202220221View paper
IAT IISER 202020202View paper

All Heat And Thermodynamics previous year questions

Practice every matching question in batches of 20, with every available option.

1
2020 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2020

Two identical containers kept at the same temperature carry the same gas with different molecular mean free paths $l_1$ and $l_2$. The gas from the first container is completely transferred into the second at the same temperature. What is the molecular mean free path of the resultant mixture in the second container?

A
$\frac{l_1 l_2}{l_1+l_2}$
B
$\sqrt{l_1 l_2}$
C
$l_1+l_2$
D
$\sqrt{l_1^2+l_2^2}$
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2
2020 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2020
An ideal rigid diatomic gas undergoes expansion at constant pressure when $\Delta Q$ heat is added to it. What is the ratio of the change in the internal energy $\Delta U$ to the heat supplied $\Delta Q$ ?
A
$\frac{\Delta U}{\Delta Q}=\frac{3}{5}$
B
$\frac{\Delta U}{\Delta Q}=\frac{5}{7}$
C
$\frac{\Delta U}{\Delta Q}=\frac{7}{9}$
D
$\frac{\Delta U}{\Delta Q}=\frac{2}{3}$
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3
2022 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2022
A monoatomic ideal gas at pressure $P$ and volume $V$ is first adiabatically compressed to volume $V / 8$ and then is allowed to expand isothermally back to its original volume. What is the final pressure of the gas?
A
$P$
B
$2 P$
C
$4 P$
D
$P / 2$
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4
2023 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2023
57. Consider a Carnot heat engine operating between a heat reservoir at temperature 600 K , and an external atmosphere at temperature 300 K . In one cycle, 1000 kJ of heat is extracted from the heat reservoir, and the associated work is input to a reversible refrigerator that operates between 200 K and the same external atmosphere at 300 K . The refrigerator completes one cycle and releases heat into the atmosphere. How much heat is released into the atmosphere at the end of one cycle of the combined system?
A
2500 Kj
B
2000 kJ
C
1000 kJ
D
500 kJ
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5
2024 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2024
Two identical boxes contain the same ideal gas. Let $\left(n_1, \lambda_1, T_1\right)$ and $\left(n_2, \lambda_2, T_2\right)$ be the number density, mean free path and temperature of the gas in the first and the second box, respectively. One of the boxes is empty into the other one. What will be the mean free path? $\lambda$ and temperature $T$ of the gas now?
A
$\lambda=\frac{\lambda_1 \lambda_2}{\lambda_1+\lambda_2}, T=\frac{n_1 T_1+n_2 T_2}{n_1+n_2}$
B
$\lambda=\frac{n_1 \lambda_1+n_2 \lambda_2}{n_1+n_2}, T=\frac{n_1 T_1+n_2 T_2}{n_1+n_2}$
C
$\lambda=\frac{n_1 \lambda_1+n_2 \lambda_2}{n_1+n_2}, T=\sqrt{T_1 T_2}$
D
$\lambda=\frac{\lambda_1 \lambda_2}{\lambda_1+\lambda_2}, T=\sqrt{T_1 T_2}$
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6
2024 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2024
One mole of an ideal gas of volume $V$ and temperature $T$ is allowed to expand adiabatically to volume $2 V$ while doing no external work. The universal gas constant is $R$. What is the pressure of the gas after expansion?
A
$\frac{R T}{V}$
B
$\frac{R T}{2 V}$
C
$\frac{2 R T}{V}$
D
$\frac{R T}{4 V}$
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7
2025 · Physics · Mechanics · Heat And Thermodynamics
IAT IISER 2025

A metallic cube initially kept at a temperature $T$ is emitting black body radiation with a power $P$ (energy emitted per unit time). If $T$ is increased by $1 \%$, the power being radiated increases by $4.5 \%$. What is the approximate percentage increase in the volume of the cube in this process?

A

$0.75 \%$

B

$0.50 \%$

C

\(1.56 \times 10^{-6} \%\)

D

\(6.25 \times 10^{-6} \%\)

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