Heat and Thermodynamics PYQs - Last 10 Years
WB JEE / Physics / Mechanics / 36 recent questions
PhysicsMechanics2017-2026
Practice 36 WB JEE 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 36 of 36 filtered questions.
1Heat And Thermodynamics
Two identical metal bars are heated in two different temperatures and allowed to cool in the same surroundings. Which one of the following figures correctly shows their cooling curves?
MCQ+1 / -0.252026
2Heat And Thermodynamics
2 moles of an ideal gas with $\frac{C_p}{C_v}=\frac{5}{3}$ are mixed with 3 moles of another ideal gas with $\frac{C_p}{C_v}=\frac{4}{3}$ ．The value of $\frac{C_p}{C_v}$ for the mixture is
MCQM+2 / -0.52026
3Heat And Thermodynamics
Temperature of a body $\theta$ is slightly more than the temperature of the surrounding $\theta_0$. Its rate of cooling $(R)$ versus temperature of the body $(\theta)$ is plotted. Its shape would be
MCQ+2 / -0.52025
4Heat And Thermodynamics
For an ideal gas, a cyclic process ABCA as shown in P-T diagram, when presented in P-V plot, would be
MCQ+1 / -0.252025
5Heat And Thermodynamics
Let $\bar{V}, V_{m s}, V_p$ denotes the mean speed, root mean square speed and most probable speed of the molecules each of mass $m$ in an ideal monoatomic gas at absolute temperature $T$ Kelvin. Which statement(s) is/are correct?
MCQM+2 / -02025
6Heat And Thermodynamics
The speed distribution for a sample of \(\mathrm{N}\) gas particles is shown below. \(\mathrm{P}(\mathrm{v})=0\) for \(\mathrm{v}>2 \mathrm{v}_0\). How many particles have speeds between \(1.2 \mathrm{v}_0\) and \(1.8 \mathrm{v}_0\) ?
MCQ+1 / -0.252024
7Heat And Thermodynamics
The internal energy of a thermodynamic system is given by \(U=a s^{4 / 3} V^\alpha\) where \(\mathrm{s}\) is entropy, \(\mathrm{V}\) is volume and '\(\mathrm{a}\)' and '\(\alpha\)' are constants. The value of \(\alpha\) is
MCQ+1 / -0.252024
8Heat And Thermodynamics
A cyclic process is shown in p-v diagram and T-S diagram. Which of the following statements is/are true?
MCQM+2 / -02023
9Heat And Thermodynamics
Two substances A and B of same mass are heated at constant rate. The variation of temperature \(\theta\) of the substances with time t is shown in the figure. Choose the correct statement.
MCQ+1 / -0.252023
10Heat And Thermodynamics
A given quantity of gas is taken from A to C in two ways; a) directly from A \(\to\) C along a straight line and b) in two steps, from A \(\to\) B and then from B \(\to\) C. Work done and heat absorbed along the direct path A \(\to\) C is ...
MCQ+1 / -0.252023
11Heat And Thermodynamics
Six molecules of an ideal gas have velocities 1, 3, 5, 5, 6 and 5 m/s respectively. At any given temperature, if \(\mathrm{\overline V}\) and \(\mathrm{V_{rms}}\) represent average and rms speed of the molecules, then
MCQ+1 / -0.252023
12Heat And Thermodynamics
One mole of an ideal monoatomic gas expands along the polytrope PV3 = constant from V1 to V2 at a constant pressure P1. The temperature during the process is such that molar specific heat \({C_V} = {{3R} \over 2}\). The total heat absorbed ...
MCQ+2 / -0.52022
13Heat And Thermodynamics
One mole of a diatomic ideal gas undergoes a process shown in P-V diagram. The total heat given to the gas (ln 2 = 0.7) is
MCQ+1 / -0.252022
14Heat And Thermodynamics
Consider a thermodynamic process where integral energy \(U = A{P^2}V\) (A = constant). If the process is performed adiabatically, then
MCQ+1 / -0.252022
15Heat And Thermodynamics
Certain amount of an ideal gas is taken from its initial state 1 to final state 4 through the paths 1 \(\to\) 2 \(\to\) 3 \(\to\) 4 as shown in figure. AB, CD, EF are all isotherms. If vp is the most probable speed of the molecules, then
MCQ+1 / -0.252022
16Heat And Thermodynamics
Consider the p - V diagram for 1 mole of an ideal monatomic gas shown in the figure. Which of the following statements is/are true?
MCQM+2 / -02021
17Heat And Thermodynamics
300 g of water at 25\(^\circ\)C is added to 100 g of ice at 0\(^\circ\)C. The final temperature of the mixture is
MCQ+1 / -0.252021
18Heat And Thermodynamics
If pressure of real gas O2, in a container is given by \(p = {{RT} \over {2V - b}} - {a \over {4{b^2}}}\), then the mass of the gas in the container is
MCQ+1 / -0.252021
19Heat And Thermodynamics
In the given figure, 1 represents isobaric, 2 represents isothermal and 3 represents adiabatic processes of an ideal gas. If \(\Delta\)U1, \(\Delta\)U2 and \(\Delta\)U3 be the changes in internal energy in these processes respectively, then
MCQ+1 / -0.252021
20Heat And Thermodynamics
When 100 g of boiling water at 100\(^\circ\)
C is added into a calorimeter containing 300 g of cold water at 10\(^\circ\)
C, temperature of the mixture becomes 20\(^\circ\)
C. Then, a metallic block of mass 1 kg at 10\(^\circ\)
C is dip...
C is added into a calorimeter containing 300 g of cold water at 10\(^\circ\)
C, temperature of the mixture becomes 20\(^\circ\)
C. Then, a metallic block of mass 1 kg at 10\(^\circ\)
C is dip...
MCQ+1 / -0.252020
21Heat And Thermodynamics
A container AB in the shape of a rectangular parallelopiped of length 5 m is divided internally by a movable partition P as shown in the figure.The left compartment is filled with a given mass of an ideal gas of molar mass 32 while the righ...
MCQ+1 / -0.252020
22Heat And Thermodynamics
A metallic block of mass 20 kg is dragged with a uniform velocity of 0.5 ms-1 on a horizontal table for 2.1 s. The coefficient of static friction between the block and the table is 0.10. What will be the maximum possible rise in temperature...
MCQ+2 / -0.52020
23Heat And Thermodynamics
An ideal gas undergoes the cyclic process abca as shown in the given p - V diagramIt rejects 50J of heat during ab and absorbs 80J of heat during ca. During bc, there is no transfer of heat and 40J of work is done by the gas. What should be...
MCQ+1 / -0.252020
24Heat And Thermodynamics
What will be the molar specific heat at constant volume of an ideal gas consisting of rigid diatomic molecules?
MCQ+1 / -0.252019
25Heat And Thermodynamics
A horizontal fire hose with a nozzle of cross-sectional area \({5 \over {\sqrt {21} }} \times {10^{ - 3}}{m^2}\) delivers a cubic metre of water in 10s. What will be the maximum possible increase in the temperature of water while it hits a ...
MCQ+2 / -0.52019
26Heat And Thermodynamics
Two black bodies A and B have equal surface areas are maintained at temperatures 27\(^\circ\)C and 177\(^\circ\)C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B?
MCQ+1 / -0.252019
27Heat And Thermodynamics
The initial pressure and volume of a given mass of an ideal gas with \(\left( {{{{C_p}} \over {{C_V}}} = \gamma } \right)\), taken in a cylinder fitted with a piston, are p0 and V0 respectively. At this stage the gas has the same temperatur...
MCQM+2 / -02019
28Heat And Thermodynamics
Consider the given diagram. An ideal gas is contained in a chamber (left) of volume V and is at an absolute temperature T. It is allowed to rush freely into the right chamber of volume V which is initially vacuum. The whole system is therma...
MCQ+1 / -0.252019
29Heat And Thermodynamics
Two identical blocks of ice move in opposite directions with equal speed and collide with each other. What will be the minimum speed required to make both the blocks melt completely, if the initial temperatures of the blocks were \(-\)8$$^\...
MCQ+2 / -0.52019
30Heat And Thermodynamics
For an ideal gas with initial pressure and volume pi and Vi respectively, a reversible isothermal expansion happens, when its volume becomes V0. Then, it is compressed to its original volume Vi by a reversible adiabatic process. If the fina...
MCQ+1 / -0.252018
31Heat And Thermodynamics
Which of the following statement(s) is/are true?"Internal energy of an ideal gas .............."
MCQM+2 / -02018
32Heat And Thermodynamics
One mole of a monoatomic ideal gas undergoes a quasistatic process, which is depicted by a straight line joining points \(({V_0},{T_0})\) and \(({2V_0},{3T_0})\) in a V-T diagram. What is the value of the heat capacity of the gas at the poi...
MCQ+1 / -0.252018
33Heat And Thermodynamics
The water equivalent of a calorimeter is 10 g and it contains 50 g of water at 15\(^\circ\)C. Some amount of ice, initially at \(-\) 10\(^\circ\)C is dropped in it and half of the ice melts till equilibrium is reached. What was the initial ...
MCQ+1 / -0.252018
34Heat And Thermodynamics
2 moles of an ideal monoatomic gas is carried from a state (p0, V0) to state (2p0, 2V0) along a straight line path in a p-V diagram. The amount of heat absorbed by the gas in the process is given by
MCQ+1 / -0.252017
35Heat And Thermodynamics
Temperature of an ideal gas, initially at 27\(^\circ\)C, is raised by 6\(^\circ\)C. The rms velocity of the gas molecules will
MCQ+1 / -0.252017
36Heat And Thermodynamics
If the pressure, temperature and density of an ideal gas are denoted by p, T and \(\rho\), respectively, the velocity of sound in the gas is
MCQM+2 / -02017