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

In the reported figure, there is a cyclic process ABCDA on a sample of 1 mol of a diatomic gas. The temperature of the gas during the process A \(\to\) B and C \(\to\) D are T1 and T2 (T1 > T2) respectively.Choose the correct option out of ...

2Heat And Thermodynamics

The number of molecules in one litre of an ideal gas at 300 K and 2 atmospheric pressure with mean kinetic energy 2 \(\times\) 10\(-\)9 J per molecules is :

3Heat And Thermodynamics

Two Carnot engines A and B operate in series such that engine A absorbs heat at T1 and rejects heat to a sink at temperature T. Engine B absorbs half of the heat rejected by Engine A and rejects heat to the sink at T3. When workdone in both...

4Heat And Thermodynamics

One mole of an ideal gas is taken through an adiabatic process where the temperature rises from 27\(^\circ\) C to 37\(^\circ\) C. If the ideal gas is composed of polyatomic molecule that has 4 vibrational modes, which of the following is tr...

5Heat And Thermodynamics

A rod CD of thermal resistance 10.0 KW\(-\)1 is joined at the middle of an identical rod AB as shown in figure. The end A, B and D are maintained at 200\(^\circ\)C, 100\(^\circ\)C and 125\(^\circ\)C respectively. The heat current in CD is P...

INTEGER+4 / -12021

6Heat And Thermodynamics

An ideal gas is expanding such that PT3 = constant. The coefficient of volume expansion of the gas is :

7Heat And Thermodynamics

A balloon carries a total load of 185 kg at normal pressure and temperature of 27\(^\circ\)C. What load will the balloon carry on rising to a height at which the barometric pressure is 45 cm of Hg and the temperature is \(-\)7\(^\circ\)C. A...

8Heat And Thermodynamics

A heat engine operates between a cold reservoir at temperature T2 = 400 K and a hot reservoir at temperature T1. It takes 300 J of heat from the hot reservoir and delivers 240 J of heat to the cold reservoir in a cycle. The minimum temperat...

INTEGER+4 / -12021

9Heat And Thermodynamics

The height of victoria falls is 63 m. What is the difference in temperature of water at the top and at the bottom of fall?[Given 1 cal = 4.2 J and specific heat of water = 1 cal g\(-\)1 \(^\circ\)0C\(-\)1]

10Heat And Thermodynamics

if the rms speed of oxygen molecules at 0\(^\circ\)C is 160 m/s, find the rms speed of hydrogen molecules at 0\(^\circ\)C.

11Heat And Thermodynamics

A container is divided into two chambers by a partition. The volume of first chamber is 4.5 litre and second chamber is 5.5 litre. The first chamber contain 3.0 moles of gas at pressure 2.0 atm and second chamber contain 4.0 moles of gas at...

INTEGER+4 / -12021

12Heat And Thermodynamics

The temperature \(\theta\) at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top and bottom temperatures \(\theta\)1 and \(\theta\)2 (as shown in figure) is given by :

13Heat And Thermodynamics

1 mole of rigid diatomic gas performs a work of \({Q \over 5}\) when heat Q is supplied to it. The molar heat capacity of the gas during this transformation is \({xR \over 8}\). The value of x is _________. [R = universal gas constant]

INTEGER+4 / -12021

14Heat And Thermodynamics

The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U \(=\) 3PV + 4. The gas is :

15Heat And Thermodynamics

The volume V of a given mass of monoatomic gas changes with temperature T according to the relation \(V = K{T^{{2 \over 3}}}\). The workdone when temperature changes by 90K will be xR. The value of x is _________. [R = universal gas constan...

INTEGER+4 / -12021

16Heat And Thermodynamics

The rms speeds of the molecules of Hydrogen, Oxygen and Carbon dioxide at the same temperature are VH, VO and VC respectively then :

17Heat And Thermodynamics

An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90W. How long it would take to increase the internal energy by 2.5 \(\times\) 103 J ?

18Heat And Thermodynamics

A refrigerator consumes an average 35W power to operate between temperature \(-\)10\(^\circ\)C to 25\(^\circ\)C. If there is no loss of energy then how much average heat per second does it transfer?

19Heat And Thermodynamics

A cylindrical container of volume 4.0 \(\times\) 10\(-\)3 m3 contains one mole of hydrogen and two moles of carbon dioxide. Assume the temperature of the mixture is 400 K. The pressure of the mixture of gases is :[Take gas constant as 8.3 J...

20Heat And Thermodynamics

The temperature of equal masses of three different liquids x, y and z are 10\(^\circ\)C, 20\(^\circ\)C and 30\(^\circ\)C respectively. The temperature of mixture when x is mixed with y is 16\(^\circ\)C and that when y is mixed with z is 26$...

21Heat And Thermodynamics

Two different metal bodies A and B of equal mass are heated at a uniform rate under similar conditions. The variation of temperature of the bodies is graphically represented as shown in the figure. The ratio of specific heat capacities is :

22Heat And Thermodynamics

A monoatomic ideal gas, initially at temperature T1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. If l1 and l2 are the lengths o...

23Heat And Thermodynamics

For a gas CP \(-\) CV = R in a state P and CP \(-\) CV = 1.10 R in a state Q, TP and TQ are the temperatures in two different states P and Q respectively. Then

24Heat And Thermodynamics

A system consists of two types of gas molecules A and B having same number density 2 \(\times\) 1025/m3. The diameter of A and B are 10 \(\mathop A\limits^o\) and 5 \(\mathop A\limits^o\) respectively. They suffer collision at room temper...

INTEGER+4 / -12021

25Heat And Thermodynamics

A heat engine has an efficiency of \({1 \over 6}\). When the temperature of sink is reduced by 62\(^\circ\)C, its efficiency get doubled. The temperature of the source is :

26Heat And Thermodynamics

A monoatomic gas of mass 4.0 u is kept in an insulated container. Container is moving with velocity 30 m/s. If container is suddenly stopped then change in temperature of the gas (R = gas constant) is \({x \over {3R}}\). Value of x is _____...

INTEGER+4 / -12021

27Heat And Thermodynamics

A diatomic gas, having \({C_p} = {7 \over 2}R\) and \({C_v} = {5 \over 2}R\), is heated at constant pressure. The ratio dU : dQ : dW :

28Heat And Thermodynamics

In a certain thermodynamical process, the pressure of a gas depends on its volume as kV3. The work done when the temperature changes from 100\(^\circ\)C to 300\(^\circ\)C will be ___________ nR, where n denotes number of moles of a gas.

INTEGER+4 / -12021

29Heat And Thermodynamics

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : When a rod lying freely is heated, no thermal stress is developed in it.Reason R : On heating, the length of the rod increas...

30Heat And Thermodynamics

Thermodynamic process is shown below on a P-V diagram for one mole of an ideal gas. If V2 = 2V1 then the ratio of temperature T2/T1 is :

31Heat And Thermodynamics

Given below are two statements :Statement I : In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the t...

32Heat And Thermodynamics

A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52K, its efficiency is doubled. The temperature in Kelvin of the source will be __________.

INTEGER+4 / -12021

33Heat And Thermodynamics

Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is '\(\alpha\)'. The metal sheet is heated uniformly, by a small temperature \(\Delta\)T, so that i...

34Heat And Thermodynamics

Match List I with List II.

List I

List II

(a)
Isothermal
(i)
Pressure constant

(b)
Isochoric
(ii)
Temperature constant

(c)
Adiabatic
(iii)
Volume cons...

35Heat And Thermodynamics

n mole of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes.A \(\to\) B : Isothermal expansion at temperature T so that the volume is doubled from V1 to V2 = 2V1 and pressure charges from P1 ...

36Heat And Thermodynamics

On the basis of kinetic theory of gases, the gas exerts pressure because its molecules :

37Heat And Thermodynamics

The root mean square speed of molecules of a given mass of a gas at 27\(^\circ\)C and 1 atmosphere pressure is 200 ms\(-\)1. The root mean square speed of molecules of the gas at 127\(^\circ\)C and 2 atmosphere pressure is $${{x \over {\sqr...

INTEGER+4 / -12021

38Heat And Thermodynamics

If one mole of an ideal gas at (P1, V1) is allowed to expand reversibly and isothermally (A to B) its pressure is reduced to one-half of the original pressure (see figure). This is followed by a constant volume cooling till its pressure is ...

39Heat And Thermodynamics

The area of cross-section of a railway track is 0.01 m2. The temperature variation is 10\(^\circ\)C. Coefficient of liner expansion of material of track is 10\(-\)5/\(^\circ\)C. The energy stored per meter in the track is ____________ J/m.(...

INTEGER+4 / -12021

40Heat And Thermodynamics

What will be the average value of energy for a monoatomic gas in thermal equilibrium at temperature T?

41Heat And Thermodynamics

The entropy of any system is given by \(S = {\alpha ^2}\beta \ln \left[ {{{\mu kR} \over {J{\beta ^2}}} + 3} \right]\) where \(\alpha\) and \(\beta\) are the constants. \(\mu\), J, k and R are no. of moles, mechanical equivalent of heat, Bo...

42Heat And Thermodynamics

The amount of heat needed to raise the temperature of 4 moles of rigid diatomic gas from 0\(^\circ\) C to 50\(^\circ\) C when no work is done is ___________. (R is the universal gas constant).

43Heat And Thermodynamics

Consider a mixture of gas molecule of types A, B and C having masses mA < mB < mC. The ratio of their root mean square speeds at normal temperature and pressure is :

44Heat And Thermodynamics

In the reported figure, heat energy absorbed by a system in going through a cyclic process is ___________ \(\pi\)J.

INTEGER+4 / -12021

45Heat And Thermodynamics

One mole of an ideal gas at 27\(^\circ\) is taken from A to B as shown in the given PV indicator diagram. The work done by the system will be _________ \(\times\) 10\(-\)1 J. [Given : R = 8.3 J/mole K, ln2 = 0.6931] (Round off to the neare...

INTEGER+4 / -12021

46Heat And Thermodynamics

The correct relation between the degrees of freedom f and the ratio of specific heat \(\gamma\) is :

47Heat And Thermodynamics

Which of the following graphs represent the behavior of an ideal gas? Symbols have their usual meaning.

48Heat And Thermodynamics

The average translational kinetic energy of N2 gas molecules at .............\(^\circ\)C becomes equal to the K.E. of an electron accelerated from rest through a potential difference of 0.1 volt. (Given kB = 1.38 \(\times\) 10\(-\)23 J/K) (...

INTEGER+4 / -12021

49Heat And Thermodynamics

The temperature of 3.00 mol of an ideal diatomic gas is increased by 40.0\(^\circ\)C without changing the pressure of the gas. The molecules in the gas rotate but do not oscillate. If the ratio of change in internal energy of the gas to the...

INTEGER+4 / -12021

50Heat And Thermodynamics

What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature T? (kB is Boltzmann constant)