NEET Physics: Behaviour of Perfect Gas and Kinetic Theory — MCQ Test 8

Q6. The mean free path of a gas molecule is \(1.5 \times 10^{-6} \, \text{m}\) at 0.2 atm. What will it be at 0.8 atm if temperature remains constant?

Q7. What is the total internal energy of 0.4 moles of a diatomic gas at 400 K with no vibrational modes? (\(R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}\))

Q8. A gas at 1.5 atm and 300 K has a density of \(1.2 \, \text{kg m}^{-3}\). What is its molecular mass? (\(R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}\), 1 atm = \(1.01 \times 10^5 \, \text{Pa}\))

Q9. A gas has a \(C_v\) of \(20.8 \, \text{J mol}^{-1} \text{K}^{-1}\). What is the ratio of specific heats (\(\gamma\))? (\(R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}\))

Q10. The mean free path of a gas molecule is \(1.0 \times 10^{-6} \, \text{m}\) at 0.5 atm. What will it be at 2 atm if temperature remains constant?

NEET Physics — Behaviour of Perfect Gas and Kinetic Theory

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The mean free path of air molecules at STP is \(2.9 \times 10^{-7} \, \text{m}\). If temperature doubles at constant pressure, what is the new mean free path?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Behaviour of Perfect Gas and Kinetic Theory. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Molecules, Temperature, Constant, Pressure, Molecular, and Container.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. The mean free path of air molecules at STP is \(2.9 \times 10^{-7} \, \text{m}\). If temperature doubles at constant pressure, what is the new mean free path?

  • A. \(1.45 \times 10^{-7} \, \text{m}\)
  • B. \(2.9 \times 10^{-7} \, \text{m}\)
  • C. \(5.8 \times 10^{-7} \, \text{m}\)
  • D. \(8.7 \times 10^{-7} \, \text{m}\)

Q2. At what temperature is the rms speed of oxygen molecules 964 m/s? (Molecular mass of \(O_2 = 32 \, \text{u}\), \(k_B = 1.38 \times 10^{-23} \, \text{J K}^{-1}\))

  • A. 900 K
  • B. 1200 K
  • C. 1500 K
  • D. 1800 K

Q3. A mixture of 0.1 moles of helium and 0.9 moles of oxygen is at 500 K in a 30-litre container. What is the total pressure? (\(R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}\))

  • A. 1.00 atm
  • B. 1.39 atm
  • C. 1.75 atm
  • D. 2.00 atm

Q4. What is the average translational kinetic energy of a hydrogen molecule at 700 K? (\(k_B = 1.38 \times 10^{-23} \, \text{J K}^{-1}\))

  • A. \(9.66 \times 10^{-21} \, \text{J}\)
  • B. \(1.242 \times 10^{-20} \, \text{J}\)
  • C. \(1.449 \times 10^{-20} \, \text{J}\)
  • D. \(1.656 \times 10^{-20} \, \text{J}\)

Q5. A gas at 1.5 atm and 300 K has a volume of 12 litres. If the temperature increases to 450 K at constant pressure, what is the new volume?

  • A. 9 litres
  • B. 12 litres
  • C. 18 litres
  • D. 24 litres

+ 5 more questions in the actual test

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