NEET Physics: Atoms and Nuclei — MCQ Test 10

Q6. In Rutherford’s scattering experiment, what does the small number of alpha-particles undergoing head-on collisions suggest?

Q7. A hydrogen atom emits a photon when an electron drops from \( n = 5 \) to \( n = 2 \). What is the energy of the photon? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

Q8. What is the minimum energy required to excite a hydrogen atom from its ground state to the first excited state? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

Q9. What was the primary evidence from Rutherford’s alpha-particle scattering experiment that led to the nuclear model of the atom?

Q10. What is the speed of an electron in the \( n = 3 \) orbit of a hydrogen atom if its speed in \( n = 1 \) is \( 2.2 \times 10^6 \, \text{m/s} \)?

NEET Physics — Atoms and Nuclei

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What is the angular momentum of an electron in the \( n = 3 \) state of a hydrogen atom? (Use \( h = 6.6 \times 10^{-34} \, \text{J·s} \))

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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 Atoms and Nuclei. 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 Momentum, Electron, Hydrogen, Frequency, Revolution, and Rutherford.

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. What is the angular momentum of an electron in the \( n = 3 \) state of a hydrogen atom? (Use \( h = 6.6 \times 10^{-34} \, \text{J·s} \))

  • A. \( 1.05 \times 10^{-34} \, \text{J·s} \)
  • B. \( 2.1 \times 10^{-34} \, \text{J·s} \)
  • C. \( 3.15 \times 10^{-34} \, \text{J·s} \)
  • D. \( 4.2 \times 10^{-34} \, \text{J·s} \)

Q2. An electron in a hydrogen atom falls from \( n = 4 \) to \( n = 2 \). What is the energy of the emitted photon? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

  • A. 1.89 eV
  • B. 10.2 eV
  • C. 2.55 eV
  • D. 12.09 eV

Q3. A hydrogen atom in the \( n = 3 \) state emits a photon and returns to the ground state. What is the maximum energy of the photon? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

  • A. 1.89 eV
  • B. 2.55 eV
  • C. 10.2 eV
  • D. 12.09 eV

Q4. What is the frequency of revolution of an electron in the first orbit of a hydrogen atom if its speed is \( 2.2 \times 10^6 \, \text{m/s} \) and radius is \( 5.3 \times 10^{-11} \, \text{m} \)?

  • A. \( 3.3 \times 10^{15} \, \text{Hz} \)
  • B. \( 6.6 \times 10^{15} \, \text{Hz} \)
  • C. \( 1.1 \times 10^{16} \, \text{Hz} \)
  • D. \( 2.2 \times 10^{15} \, \text{Hz} \)

Q5. In Rutherford’s model, what is the ratio of the size of the nucleus to the size of the atom if the nuclear radius is \( 10^{-15} \, \text{m} \) and atomic radius is \( 10^{-10} \, \text{m} \)?

  • A. \( 10^{-5} \)
  • B. \( 10^{-4} \)
  • C. \( 10^5 \)
  • D. \( 10^4 \)

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