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 22 of 422 filtered questions.

1Heat And Thermodynamics

A 25 × 10–3 m3 volume cylinder is filled with
1 mol of O2 gas at room temperature (300K).
The molecular diameter of O2, and its root
mean square speed, are found to be 0.3 nm, and
200 m/s, respectively. What is the average
collision rate (p...

2Heat And Thermodynamics

A cylinder with fixed capacity of 67.2 lit
contains helium gas at STP. The amount of heat
needed to raise the temperature of the gas by
20°C is : [Given that R = 8.31 J mol–1 K–1]

3Heat And Thermodynamics

When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by
\(\Delta\)T. the heat required to produce the same change in temperature, at a constant pressure is :

4Heat And Thermodynamics

One mole of ideal gas passes through a process where pressure and volume obey the relation
\(P = {P_0}\left[ {1 - {1 \over 2}{{\left( {{{{V_0}} \over V}} \right)}^2}} \right]\).
Here P0 and V0 are constants. Calculate the change in the temp...

5Heat And Thermodynamics

Two moles of helium are mixed with n moles of hydrogen. If \({{Cp} \over {Cv}} = {3 \over 2}\) for the mixture, then the value of n is :

6Heat And Thermodynamics

One mole of an ideal monoatomic gas is taken along the path ABCA as show in the PV diagram. The maximum temperature attained by the gas along the path BC is given by :

7Heat And Thermodynamics

One mole of an ideal monoatomic gas is compressed isothermally in a rigid vessel to double its pressure at room temperature, \({27^ \circ }C.\) The work done on the gas will be :

8Heat And Thermodynamics

A Carnot's engine works as a refrigerator between \(250\) K and \(300\) K. It receives \(500\) cal heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is :

9Heat And Thermodynamics

Two Carnot engines A and B are operated in series. Engine A receives heat from a reservoir at 600 K and rejects heat to a reservoir at temperature T. Engine B receives heat rejected by engine A and in turn rejects it to a reservoir at 100 K...

10Heat And Thermodynamics

The value closest to the thermal velocity of a Helium atom at room temperature (300 K) in ms-1 is :
[kB =1.4 \(\times\) 10-23 J/K; mHe = 7 \(\times\) 10 -27 kg ]

11Heat And Thermodynamics

Two moles of an ideal monatomic gas occupies a volume V at 27oC. The gas expands adiabatically to a
volume 2 V. Calculate (a) the final temperature of the gas and (b) change in its internal energy.

12Heat And Thermodynamics

A steel rail of length 5 m and area of cross section 40cm2
is prevented from expanding along its length while the temperature rises
by 10oC. If coefficient of linear expansion and Young’s modulus of steel are 1.2×10−5 K−1 and 2×1011 Nm−2...

13Heat And Thermodynamics

N moles of a diatomic gas in a cylinder are at a temperature T. Heat is supplied to the cylinder such that the temperature remains constant but n moles of the diatomic gas get converted into monoatomic gas. What is the change in the total k...

14Heat And Thermodynamics

For the P-V diagram given for an ideal gas,

out of the following which one correctly represents the T-P diagram ?

15Heat And Thermodynamics

A compressive force, F is applied at the two ends of a long thin steel rod. It is heated, simultaneously, such that its temperature increases by \(\Delta\)T. The net change in its length is zero. Let \(\ell\) be the length of the rod, A i...

16Heat And Thermodynamics

An engine operates by taking n moles of an ideal gas through the cycle ABCDA shown in figure. The thermal efficiency of the engine is :
(Take Cv = 1.5 R, where R is gas constant)

17Heat And Thermodynamics

In an experiment, a sphere of aluminium of mass 0.20 kg is heated upto 150oC. Immediately, it is put into water of volume 150 cc at 27oC kept in a calorimeter of water equivalent to 0.025 kg. Final temperature of the system is 40oC. The spe...

18Heat And Thermodynamics

An ideal gas has molecules with 5 degrees of freedom. The ratio of specific heats at constant pressure (Cp ) and at constant volume (Cv) is :

19Heat And Thermodynamics

A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm,
filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to
be 75oC. T is given by: (Give...

20Heat And Thermodynamics

An external pressure P is applied on a cube at 0oC so that it is equally compressed from all sides. K is the
bulk modulus of the material of the cube and \(\alpha\) is its coefficient of linear expansion. Suppose we want to
bring the cube t...

21Heat And Thermodynamics

CP and Cv are specific heats at constant pressure and constant volume respectively. It is observed that CP – Cv = a for hydrogen gas CP – Cv = b for nitrogen gas The correct relation between a and b is

22Heat And Thermodynamics

The temperature of an open room of volume 30 m3 increases from 17oC to 27oC due to the sunshine. The atmospheric pressure in the room remains 1 \(\times\) 105 Pa. If Ni
and Nf are the number of molecules in the room
before and after heat...