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Kinetic Theory — NEET & JEE Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

Under which conditions does a real gas most closely approach ideal behaviour?
  1. Low pressure and high temperature ✓
  2. High pressure and low temperature
  3. High pressure at every temperature
  4. Near condensation only
Answer: A. At low pressure and high temperature molecules are far apart and interaction effects are relatively negligible.
Why not B: Crowding and low thermal energy make intermolecular interactions most important.
Why not C: High pressure reduces separation and increases departures from the ideal model.
Why not D: Near condensation the neglected attractive forces strongly affect the gas.
A gas occupies 24.9 L at 1.00×10⁵ Pa and 300 K. Taking R=8.30 J mol⁻¹ K⁻¹, how many moles are present?
  1. 0.100 mol
  2. 10.0 mol
  3. 1.00 mol ✓
  4. 3.00 mol
Answer: C. n=PV/(RT)=10⁵×2.49×10⁻²/(8.30×300)=1.00 mol.
Why not A: This treats 24.9 L as 2.49×10⁻³ m³ instead of 2.49×10⁻² m³.
Why not B: This converts litres in the opposite direction, adding a factor ten.
Why not D: This divides by temperature alone and omits the gas constant.
Nitrogen at 300 K occupies 24.9 L at 2.49×10⁵ Pa. Taking R=8.30 J mol⁻¹ K⁻¹ and molar mass 28.0 g mol⁻¹, what gas mass is present?
  1. 69.7 g ✓
  2. 28.0 g
  3. 697 g
  4. 6.97 g
Answer: A. n=PV/(RT)=2.49 mol, so mass=2.49×28.0=69.7 g.
Why not B: This assumes one mole without using the stated pressure and volume.
Why not C: This treats 24.9 L as 0.249 m³, adding a factor ten to mole count.
Why not D: This treats 24.9 L as 0.00249 m³, losing a factor ten.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Kinetic Theory →

Other NEET Physics chapters

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Questions

How many NEET and JEE questions are there on Kinetic Theory?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET and JEE Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.