Heat and Thermodynamics PYQs - Last 10 Years

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Practice 422 JEE Main Physics questions from Heat and Thermodynamics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Heat and Thermodynamics Questions

Showing 50 of 422 filtered questions.

1Heat And Thermodynamics

A piston of mass $M$ is hung from a massless spring whose restoring force law goes as $F=-k x^3$, where k is the spring constant of appropriate dimension. The piston separates the vertical chamber into two parts, where the bottom part is fi...

2Heat And Thermodynamics

During the melting of a slab of ice at 273 K at atmospheric pressure :

3Heat And Thermodynamics

A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of $800 \mathrm{~cm}^3$ and temperature $27^{\circ} \mathrm{C}$. The change in temperature when the gas is adiabatically compressed...

4Heat And Thermodynamics

Pressure of an ideal gas, contained in a closed vessel, is increased by $0.4 \%$ when heated by $1^{\circ} \mathrm{C}$. Its initial temperature must be:

5Heat And Thermodynamics

An ideal gas exists in a state with pressure $P_0$, volume $V_0$. It is isothermally expanded to 4 times of its initial volume $\left(\mathrm{V}_0\right)$, then isobarically compressed to its original volume. Finally the system is heated is...

6Heat And Thermodynamics

The equation for real gas is given by $\left(\mathrm{P}+\frac{\mathrm{a}}{\mathrm{V}^2}\right)(\mathrm{V}-\mathrm{b})=\mathrm{RT}$, where $\mathrm{P}, \mathrm{V}, \mathrm{T}$ and R are the pressure, volume, temperature and gas constant, res...

7Heat And Thermodynamics

$\gamma_{\mathrm{A}}$ is the specific heat ratio of monoatomic gas A having 3 translational degrees of freedom. $\gamma_B$ is the specific heat ratio of polyatomic gas $B$ having 3 translational, 3 rotational degrees of freedom and 1 vibrat...

INTEGER+4 / -12025

8Heat And Thermodynamics

In an adiabatic process, which of the following statements is true?

9Heat And Thermodynamics

The internal energy of air in $4 \mathrm{~m} \times 4 \mathrm{~m} \times 3 \mathrm{~m}$ sized room at 1 atmospheric pressure will be___________________$\times 10^6 \mathrm{~J}$
(Consider air as diatomic molecule)

INTEGER+4 / -12025

10Heat And Thermodynamics

Identify the characteristics of an adiabatic process in a monoatomic gas.
(A) Internal energy is constant.
(B) Work done in the process is equal to the change in internal energy.
(C) The product of temperature and volume is a constant.
(D) ...

11Heat And Thermodynamics

\(\text { Match List - I with List - II. }\)

$$ \begin{array}{lll} & \text { List - I } & {List - II }\\ \text { } \\ \text { (A) } & \text { Heat capacity of body } & \text { (I) } \mathrm{J} \mathrm{~kg}^{-1} \\ \text { (B) } & \text ...

12Heat And Thermodynamics

A container of fixed volume contains a gas at 27°C. To double the pressure of the gas, the temperature of gas should be raised to _____ °C.

INTEGER+4 / -12025

13Heat And Thermodynamics

The work done in an adiabatic change in an ideal gas depends upon only :

14Heat And Thermodynamics

A poly-atomic molecule $\left(C_V=3 R, C_P=4 R\right.$, where $R$ is gas constant) goes from phase space point $\mathrm{A}\left(\mathrm{P}_{\mathrm{A}}=10^5 \mathrm{~Pa}, \mathrm{~V}_{\mathrm{A}}=4 \times 10^{-6} \mathrm{~m}^3\right)$ to po...

15Heat And Thermodynamics

A cup of coffee cools from 90°C to 80°C in t minutes when the room temperature is 20°C. The time taken by the similar cup of coffee to cool from 80°C to 60°C at the same room temperature is:

16Heat And Thermodynamics

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : With the increase in the pressure of an ideal gas, the volume falls off more rapidly in an isothermal process in compar...

17Heat And Thermodynamics

The difference of temperature in a material can convert heat energy into electrical energy. To harvest the heat energy, the material should have

18Heat And Thermodynamics

For a particular ideal gas which of the following graphs represents the variation of mean squared velocity of the gas molecules with temperature?

19Heat And Thermodynamics

A Carnot engine $(\mathrm{E})$ is working between two temperatures 473 K and 273 K . In a new system two engines - engine $E_1$ works between 473 K to 373 K and engine $E_2$ works between 373 K to 273 K .
If $\eta_{12}, \eta_1$ and $\eta_2$...

20Heat And Thermodynamics

The kinetic energy of translation of the molecules in 50 g of $ \text{CO}_2 $ gas at 17°C is :

21Heat And Thermodynamics

The ratio of vapour densities of two gases at the same temperature is $ \frac{4}{25} $, then the ratio of r.m.s. velocities will be :

22Heat And Thermodynamics

An ideal gas goes from an initial state to final state. During the process, the pressure of gas increases linearly with temperature.
A. The work done by gas during the process is zero.
B. The heat added to gas is different from change in it...

23Heat And Thermodynamics

The temperature of 1 mole of an ideal monoatomic gas is increased by $50^{\circ} \mathrm{C}$ at constant pressure. The total heat added and change in internal energy are $E_1$ and $E_2$, respectively. If $\frac{E_1}{E_2}=\frac{x}{9}$ then t...

INTEGER+4 / -12025

24Heat And Thermodynamics

The magnitude of heat exchanged by a system for the given cyclic process ABCA (as shown in figure) is (in SI unit) :

25Heat And Thermodynamics

Which of the following figure represents the relation between Celsius and Fahrenheit temperatures?

26Heat And Thermodynamics

The temperature of a body in air falls from $40^{\circ} \mathrm{C}$ to $24^{\circ} \mathrm{C}$ in 4 minutes. The temperature of the air is $16^{\circ} \mathrm{C}$. The temperature of the body in the next 4 minutes will be :

27Heat And Thermodynamics

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In an insulated container, a gas is adiabatically shrunk to half of its initial volume. The temperature of the gas dec...

28Heat And Thermodynamics

An ideal gas initially at $0^{\circ} \mathrm{C}$ temperature, is compressed suddenly to one fourth of its volume. If the ratio of specific heat at constant pressure to that at constant volume is $3 / 2$, the change in temperature due to the...

INTEGER+4 / -12025

29Heat And Thermodynamics

A gun fires a lead bullet of temperature 300 K into a wooden block. The bullet having melting temperature of 600 K penetrates into the block and melts down. If the total heat required for the process is 625 J , then the mass of the bullet i...

30Heat And Thermodynamics

Match the List - I with List - II

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.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:n...

31Heat And Thermodynamics

Using the given $P-V$ diagram, the work done by an ideal gas along the path $A B C D$ is :

32Heat And Thermodynamics

Water of mass $m$ gram is slowly heated to increase the temperature from $T_1$ to $T_\gamma$. The change in entropy of the water, given specific heat of water is $1 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}$, is :

33Heat And Thermodynamics

Three conductors of same length having thermal conductivity $k_1, k_2$ and $k_3$ are connected as shown in figure.

Area of cross sections of $1^{\text {st }}$ and $2^{\text {nd }}$ conductor are same and for $3^{\text {rd }}$ conductor it ...

INTEGER+4 / -12025

34Heat And Thermodynamics

Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K . If the energy radiated from the smaller body is E,...

35Heat And Thermodynamics

An amount of ice of mass $10^{-3} \mathrm{~kg}$ and temperature $-10^{\circ} \mathrm{C}$ is transformed to vapour of temperature $110^{\circ} \mathrm{C}$ by applying heat. The total amount of work required for this conversion is, (Take, spe...

36Heat And Thermodynamics

For a diatomic gas, if $\gamma_1=\left(\frac{C p}{C v}\right)$ for rigid molecules and $\gamma_2=\left(\frac{C p}{C v}\right)$ for another diatomic molecules, but also having vibrational modes. Then, which one of the following options is co...

37Heat And Thermodynamics

Given are statements for certain thermodynamic variables,
(A) Internal energy, volume $(\mathrm{V})$ and mass $(\mathrm{M})$ are extensive variables.
(B) Pressure (P), temperature ( T ) and density ( $\rho$ ) are intensive variables.
(C) Vo...

38Heat And Thermodynamics

A sample of 1 mole gas at temperature \(T\) is adiabatically expanded to double its volume. If adiab constant for the gas is \(\gamma=\frac{3}{2}\), then the work done by the gas in the process is :

39Heat And Thermodynamics

The volume of an ideal gas \((\gamma=1.5)\) is changed adiabatically from 5 litres to 4 litres. The ratio of initial pressure to final pressure is :

40Heat And Thermodynamics

A real gas within a closed chamber at \(27^{\circ} \mathrm{C}\) undergoes the cyclic process as shown in figure. The gas obeys \(P V^3=R T\) equation for the path \(A\) to \(B\). The net work done in the complete cycle is (assuming $$R=8 \m...

41Heat And Thermodynamics

The temperature of a gas is \(-78^{\circ} \mathrm{C}\) and the average translational kinetic energy of its molecules is \(\mathrm{K}\). The temperature at which the average translational kinetic energy of the molecules of the same gas becom...

42Heat And Thermodynamics

Two different adiabatic paths for the same gas intersect two isothermal curves as shown in P-V diagram. The relation between the ratio \(\frac{V_a}{V_d}\) and the ratio \(\frac{V_b}{V_c}\) is:

43Heat And Thermodynamics

A mixture of one mole of monoatomic gas and one mole of a diatomic gas (rigid) are kept at room temperature \((27^{\circ} \mathrm{C})\). The ratio of specific heat of gases at constant volume respectively is:

44Heat And Thermodynamics

A diatomic gas \((\gamma=1.4)\) does \(100 \mathrm{~J}\) of work in an isobaric expansion. The heat given to the gas is :

45Heat And Thermodynamics

Given below are two statements :
Statement (I) : The mean free path of gas molecules is inversely proportional to square of molecular diameter.
Statement (II) : Average kinetic energy of gas molecules is directly proportional to absolute te...

46Heat And Thermodynamics

A sample contains mixture of helium and oxygen gas. The ratio of root mean square speed of helium and oxygen in the sample, is :

47Heat And Thermodynamics

The specific heat at constant pressure of a real gas obeying \(P V^2=R T\) equation is:

48Heat And Thermodynamics

A total of \(48 \mathrm{~J}\) heat is given to one mole of helium kept in a cylinder. The temperature of helium increases by \(2^{\circ} \mathrm{C}\). The work done by the gas is:
Given, $$\mathrm{R}=8.3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm...

49Heat And Thermodynamics

Energy of 10 non rigid diatomic molecules at temperature \(\mathrm{T}\) is :

50Heat And Thermodynamics

Given below are two statements:
Statement (I) : Dimensions of specific heat is \([\mathrm{L}^2 \mathrm{~T}^{-2} \mathrm{~K}^{-1}]\).
Statement (II) : Dimensions of gas constant is $$[\mathrm{M} \mathrm{L}^2 \mathrm{~T}^{-1} \mathrm{~K}^{-1}...