Heat and Thermodynamics PYQs - Last 5 Years
WB JEE / Physics / Mechanics / 15 recent questions
PhysicsMechanics2022-2026
Practice 15 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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2022-2026
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2022-2026
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Last 5 Years Heat and Thermodynamics Questions
Showing 15 of 15 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