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 statement, among the following is :

The root mean square speed of helium is the largest

The root mean square speed of sulfur hexafluoride is the largest

All vessels contain unequal number of respective molecules

The root mean square speed of molecules is same in all three cases

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

$\frac{1}{\sqrt{2} n \pi d^{2}}$

$\frac{1}{\sqrt{2} n^{2} \pi d^{2}}$

$${1 \over {\sqrt 2 {n^2}{\pi ^2}{d^2}}}$$

Heat And Thermodynamics — NEET Previous Year Questions

42 solved PYQs · 2016–2026 · Physics

Solved PYQs: 42
Years covered: 2016–2026
Avg / year: ~4
Subject: Physics

How many NEET questions come from Heat And Thermodynamics?

Heat And Thermodynamics has contributed 42 questions to National Eligibility cum Entrance Test (UG) papers between 2016 and 2026 — an average of about 4 questions a year. That count is measured from EByAi’s bank of 46,150 NEET questions, not estimated from a syllabus. Every one of the 42 questions carries a written, step-by-step solution, and each is tagged to Heat And Thermodynamics within Physics, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Heat And Thermodynamics questions from real NEET papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 42 Heat And Thermodynamics questions (with full written solutions) are available in practice.

Question 1 · NEET 2024
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.
1. (A) $A, B and E only$
2. (B) $B, C and D only$
3. (C) $A, B and C only$
4. (D) $A, C and D only$
Show answerAnswer
$Answer: (D) A, C and D only$
Question 2 · NEET 2022
The volume occupied by the molecules contained in 4.5 kg of water at STP, if the intermolecular forces vanish away is
1. (A) $5.6 \times 1 0^{6} m 3$
2. (B) $5.6 \times 1 0^{3} m 3$
3. (C) $5.6 \times 1 0^{- 3} m 3$
4. (D) $5.6 m3$
Show answerAnswer
$Answer: (D) 5.6 m3$
Question 3 · NEET 2022
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 statement, among the following is :
1. (A) $The root mean square speed of sulfur hexafluoride is the largest$
2. (B) $All vessels contain unequal number of respective molecules$
3. (C) $The root mean square speed of molecules is same in all three cases$
4. (D) $The root mean square speed of helium is the largest$
Show answerAnswer
$Answer: (D) The root mean square speed of helium is the largest$
Question 4 · NEET 2020
The mean free path for a gas, with molecular diameter d and number density n can be expressed as :
1. (A) $\frac{1}{2 nπ d ^{2}}$
2. (B) $\frac{1}{2 n ^{2} π d ^{2}}$
3. (C) $\frac{1}{2 n ^{2} π ^{2} d ^{2}}$
4. (D) $\frac{1}{2 nπ d}$
Show answerAnswer
$Answer: (A) \frac{1}{2 nπ d ^{2}}$
Question 5 · NEET 2020
The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T absolute temperature)
1. (A) $\frac{3}{2} k_{B} T$
2. (B) $\frac{5}{2} k_{B} T$
3. (C) $\frac{7}{2} k_{B} T$
4. (D) $\frac{1}{2} k_{B} T$
Show answerAnswer
$Answer: (A) \frac{3}{2} k_{B} T$

Heat And Thermodynamics questions by year

Year	Questions	Share of chapter questions
2026	2
2025	4
2024	5
2023	4
2022	5
2021	2
2020	5
2019	2
2018	4
2017	3
2016	6

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FAQs

How many NEET questions have been asked from Heat And Thermodynamics?

EByAi's bank holds 42 real NEET questions from Heat And Thermodynamics, asked between 2016 and 2026 — about 4 per year on average. Every count is measured from actual papers, not estimated.

Is Heat And Thermodynamics important for NEET?

42 questions over 11 papers make Heat And Thermodynamics a steady-weightage chapter in NEET Physics. The year-wise table above shows exactly how often it appears.

Can I solve Heat And Thermodynamics PYQs online for free?

Yes. EByAi lets you solve NEET past-year questions in the browser with written solutions — free daily practice, no card needed.

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