Heat and Thermodynamics PYQs - Last 10 Years

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Practice 41 NEET 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 41 of 41 filtered questions.

1Heat And Thermodynamics

One mole of an ideal monatomic gas undergoes a cyclic process as shown in the figure. The total heat supplied to the gas is:

2Heat And Thermodynamics

The mean free path of molecules in an ideal gas $A$ is half that of another ideal gas $B$. The diameter of the spherical molecules of gas $A$ is twice the diameter of the molecules of $B$. If number densities of the gases $A$ and $B$ are $n...

3Heat And Thermodynamics

An ideal gas is made of polyatomic molecules. Each of the molecules has three translational, three rotational and $f$ number of vibrational modes. If the ratio of heat capacities $C_P / C_V$ of the gas is $8 / 7$, then the value of $f$ is:

4Heat And Thermodynamics

In an adiabatic expansion, the temperature of one mole of an ideal monatomic gas ( $\gamma=5 / 3$ ) decreases from 60 K to 50 K . The work done by the gas in the process is:
(Take the universal gas constant as $R=8.3 \mathrm{~J} \mathrm{~mo...

5Heat And Thermodynamics

The temperature of a metallic sphere of radius $R$ is increased by a small amount $\Delta T$. If the linear coefficient of thermal expansion of the metal is $\alpha$, the approximate increase in the volume of the sphere is:

6Heat And Thermodynamics

An electric heater supplies heat to a system at a rate of 100 W . If the system performs work at a rate of $75 \mathrm{~J} / \mathrm{s}$, then the rate at which internal energy increases will be:

7Heat And Thermodynamics

A flask contains argon and chlorine in the ratio of $2: 1$ by mass. The temperature of the mixture is $27^{\circ} \mathrm{C}$. The ratio of root mean square speed of the molecules of the two gases $\left(\frac{V_{\mathrm{rms}}^{\mathrm{Ar}}...

8Heat And Thermodynamics

Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity $2 K$ while that in the middle has thermal conductivity $K$. The left end of the combination is maintained ...

9Heat And Thermodynamics

A container has two chambers of volumes $V_1=2$ litres and $V_2=3$ litres separated by a partition made of a thermal insulator. The chambers contain $n_1=5$ and $n_2=4$ moles of ideal gas at pressures $p_1=1 \mathrm{~atm}$ and $p_2=2 \mathr...

10Heat And Thermodynamics

Two gases $A$ and $B$ are filled at the same pressure in separate cylinders with movable pistons of radius $r_A$ and $r_B$, respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pisto...

11Heat And Thermodynamics

An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11 atmospheric pressures at temperature $27^{\circ} \mathrm{C}$. The mass of the oxygen withdrawn...

12Heat And Thermodynamics

According to the law of equipartition of energy, the number of vibrational modes of a polyatomic gas of constant \(\gamma=\frac{C_p}{C_v}\) is (\(C_P\) where \(C_V\) are the specific heat capacities of the gas at constant pressure and const...

13Heat And Thermodynamics

The equilibrium state of a thermodynamic system is described by
A. Pressure
B. Total heat
C. Temperature
D. Volume
E. Work done
Choose the most appropriate answer from the options given below.

14Heat And Thermodynamics

Given below are two statements: One is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\).
Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer.
Reason R: The ...

15Heat And Thermodynamics

The following graph represents the \(T\)-\(V\) curves of an ideal gas (where \(T\) is the temperature and \(V\) the volume) at three pressures \(P_1, P_2\) and \(P_3\) compared with those of Charles's law represented as dotted lines.

Then ...

16Heat And Thermodynamics

A thermodynamic system is taken through the cycle \(abcda\). The work done by the gas along the path \(b c\) is:

17Heat And Thermodynamics

A container of volume \(200 \mathrm{~cm}^3\) contains 0.2 mole of hydrogen gas and 0.3 mole of argon gas. The pressure of the system at temperature \(200 \mathrm{~K}\) (\(\mathrm{R}=8.3 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\)) will be :-

18Heat And Thermodynamics

For the given cycle, the work done during isobaric process is:

19Heat And Thermodynamics

A Carnot engine has an efficiency of \(50 \%\) when its source is at a temperature \(327^{\circ} \mathrm{C}\). The temperature of the sink is :-

20Heat And Thermodynamics

The temperature of a gas is \(-50^{\circ} \mathrm{C}\). To what temperature the gas should be heated so that the rms speed is increased by \(3\) times?

21Heat And Thermodynamics

Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains helium (monoatomic), the second contains fluorine (diatomic) and the third contains sulfur hexafluoride (polyatomic). The correct sta...

22Heat And Thermodynamics

Two rods one made of copper and other made of steel of same length and same cross sectional area are joined together. The thermal conductivity of copper and steel are 385 J s\(-\)1 K\(-\)1 m\(-\)1 and 50 J s\(-\)1 K\(-\)1 m\(-\)1 respective...

23Heat And Thermodynamics

An ideal gas follows a process described by the equation \(P{V^2} = C\) from the initial \(({P_1},\,{V_1},\,{T_1})\) to final \(({P_2},\,{V_2},\,{T_2})\) thermodynamic states, where C is a constant. Then

24Heat And Thermodynamics

The volume occupied by the molecules contained in 4.5 kg water at STP, if the intermolecular forces vanish away is

25Heat And Thermodynamics

An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric and isochoric. The curve which represents the adiabatic process among 1, 2, 3 and ...

26Heat And Thermodynamics

Match Column - I and Column - II and choose the correct match from the given choices.

Column - I

Column - II

(A)
Root mean square speed of gas molecules
(P)
\({1 \over 3}nm{\overline v ^2}\)

...

27Heat And Thermodynamics

A cup of coffee cools from 90\(^\circ\)C to 80\(^\circ\)C in t minutes, when the room temperature is 20\(^\circ\)C. The time taken by a similar cup of coffee to cool from 80\(^\circ\)C to 60\(^\circ\)C at a room temperature same at 20$$^\ci...

28Heat And Thermodynamics

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire systems is thermally insulated. The stop cock is sudden...

29Heat And Thermodynamics

A cylinder contains hydrogen gas at pressure 249 kPa and temperature 27\(^\circ\)CIts density is : (R = 8.3 J mol-1 K-1)

30Heat And Thermodynamics

The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2 (r1 = 1.5r2) through 1 K are in the ratio :

31Heat And Thermodynamics

The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T absolute temperature)

32Heat And Thermodynamics

The mean free path for a gas, with molecular diameter d and number density n can be expressed as :

33Heat And Thermodynamics

Increase in tempertaure of a gas filled in a container would lead to :

34Heat And Thermodynamics

In which of the following processes, heat is neither absorbed nor released by a system?

35Heat And Thermodynamics

The efficiency of an ideal heat engine working
between the freezing point and boiling point
of water, is

36Heat And Thermodynamics

At what temperature will the rms speed of
oxygen molecules become just sufficient for
escaping from the Earth’s atmosphere? (Given :
Mass of oxygen molecule (m) = 2.76 × 10–26 kg,
Boltzmann’s constant kB
= 1.38 × 10–23 J K–1)

37Heat And Thermodynamics

A sample of 0.1 g of water at 100°C and normal
pressure (1.013 × 105
N m–2) requires 54 cal
of heat energy to convert to steam at 100°C.
If the volume of the steam produced is 167.1 cc,
the change in internal energy of the sample, is

38Heat And Thermodynamics

The volume (V) of a monatomic
gas varies with its temperature
(T), as shown in the graph. The
ratio of work done by the gas,
to the heat absorbed by it, when
it undergoes a change from state
A to state B, is

39Heat And Thermodynamics

Thermodynamic processes are indicated in the following diagram.

Match the following

.tg {border-collapse:collapse;border-spacing:0;border:none;width:100%}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:...

40Heat And Thermodynamics

A carnot engine having an efficiency of \({1 \over {10}}\) as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

41Heat And Thermodynamics

A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is