NEET Physics: Atoms and Nuclei — MCQ Test 5

Q6. What is the total energy of an electron in the \( n = 5 \) state of a hydrogen atom? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

Q7. What is the wavelength of the photon emitted when an electron in a hydrogen atom drops from \( n = 3 \) to \( n = 2 \)? (Use \( h = 6.6 \times 10^{-34} \, \text{J·s} \), \( c = 3 \times 10^8 \, \text{m/s} \), 1 eV = \( 1.6 \times 10^{-19} \, \text{J} \))

Q8. Which of the following is a key feature of Bohr’s model for the hydrogen atom?

Q9. In Rutherford’s model, what provides the centripetal force for an electron orbiting the nucleus in a hydrogen atom?

Q10. In Rutherford’s model, what is the order of magnitude of the ratio of the atomic size to the nuclear size?

NEET Physics — Atoms and Nuclei

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The radius of the first orbit in a hydrogen atom is \( 5.3 \times 10^{-11} \, \text{m} \). What is the circumference of the fourth orbit?

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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 Hydrogen, Circumference, Following, Statements, Rutherford, and Scattering.

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 radius of the first orbit in a hydrogen atom is \( 5.3 \times 10^{-11} \, \text{m} \). What is the circumference of the fourth orbit?

  • A. \( 5.33 \times 10^{-9} \, \text{m} \)
  • B. \( 3.0 \times 10^{-9} \, \text{m} \)
  • C. \( 1.33 \times 10^{-9} \, \text{m} \)
  • D. \( 2.12 \times 10^{-9} \, \text{m} \)

Q2. Which of the following statements is correct about Thomson’s model of the atom?

  • A. Positive charge is spread uniformly with electrons embedded in it
  • B. Positive charge is concentrated in a small nucleus
  • C. Electrons orbit the nucleus like planets
  • D. Atom consists of discrete energy levels

Q3. In the Bohr model, what is the ground state of a hydrogen atom?

  • A. State with \( n = 2 \)
  • B. State with zero energy
  • C. State with \( n = 1 \)
  • D. State with infinite radius

Q4. In Rutherford’s scattering experiment, what fraction of alpha-particles scatter by more than 90° out of 8000 incident particles?

  • A. 0.000125
  • B. 0.0014
  • C. 0.01
  • D. 0.00025

Q5. An electron in a hydrogen atom has a speed of \( 2.2 \times 10^6 \, \text{m/s} \) in the first orbit. What is its kinetic energy? (Mass of electron = \( 9.1 \times 10^{-31} \, \text{kg} \), 1 eV = \( 1.6 \times 10^{-19} \, \text{J} \))

  • A. 13.6 eV
  • B. 6.8 eV
  • C. 27.2 eV
  • D. 3.4 eV

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