NEET Physics: Behaviour of Perfect Gas and Kinetic Theory — MCQ Test 10

Q6. What is the average translational kinetic energy of a neon atom at 800 K? (\(k_B = 1.38 \times 10^{-23} \, \text{J K}^{-1}\))

Q7. What is the collision frequency of a gas molecule if its mean free path is \(2 \times 10^{-7} \, \text{m}\) and average speed is 500 m/s?

Q8. A gas mixture has equal masses of neon and nitrogen at 300 K. What is the ratio of their rms speeds? (Atomic mass: Ne = 20.2 u, \(N_2 = 28 \, \text{u}\))

Q9. A gas occupies 33.6 litres at STP. How many molecules are present? (\(N_A = 6.02 \times 10^{23} \, \text{mol}^{-1}\), molar volume at STP = 22.4 litres)

Q10. A vessel contains 1 mole of a diatomic gas at 300 K. What is its total internal energy if vibrational modes are not excited? (\(R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}\))

NEET Physics — Behaviour of Perfect Gas and Kinetic Theory

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A gas at 1 atm and 273 K has a density of 1.43 kg m−31.43 \, \text{kg m}^{-3}. What is its molecular mass? (R=8.31 J mol−1K−1R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}, 1 atm = 1.01×105 Pa1.01 \times 10^5 \, \text{Pa})

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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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Easy
10
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0
Hard

Key concepts covered in this specific test include Molecular, Collisions, Molecule, Required, Temperature, and Constant.

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.

A gas at 1 atm and 273 K has a density of 1.43 kg m−31.43 \, \text{kg m}^{-3}. What is its molecular mass? (R=8.31 J mol−1K−1R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}, 1 atm = 1.01×105 Pa1.01 \times 10^5 \, \text{Pa})

  • A.

    28 g/mol

  • B.

    32 g/mol

  • C.

    36 g/mol

  • D.

    40 g/mol

Q2.

A gas has a CvC_v of 21.0 J mol−1K−121.0 \, \text{J mol}^{-1} \text{K}^{-1}. What is its CpC_p? (R=8.31 J mol−1K−1R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1})

  • A.

    25.4 J mol⁻¹ K⁻¹

  • B.

    27.1 J mol⁻¹ K⁻¹

  • C.

    29.3 J mol⁻¹ K⁻¹

  • D.

    33.2 J mol⁻¹ K⁻¹

Q3.

What is the time between collisions for a gas molecule with a mean free path of 4.5×10−7 m4.5 \times 10^{-7} \, \text{m} and average speed of 450 m/s?

  • A.

    5.0×10−10 s5.0 \times 10^{-10} \, \text{s}

  • B.

    7.5×10−10 s7.5 \times 10^{-10} \, \text{s}

  • C.

    1.0×10−9 s1.0 \times 10^{-9} \, \text{s}

  • D.

    1.5×10−9 s1.5 \times 10^{-9} \, \text{s}

Q4.

How much heat is required to raise the temperature of 0.5 moles of neon by 25 K at constant volume? (R=8.31 J mol−1K−1R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1})

  • A.

    103.9 J

  • B.

    155.8 J

  • C.

    207.8 J

  • D.

    259.7 J

Q5.

How many degrees of freedom does a diatomic molecule have if its vibrational mode is active?

  • A.

    5

  • B.

    6

  • C.

    7

  • D.

    8

+ 5 more questions in the actual test

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