NEET Physics: Atoms and Nuclei — MCQ Test 9

Q6. What is the speed of an electron in the \( n = 4 \) orbit of a hydrogen atom if its speed in \( n = 1 \) is \( 2.2 \times 10^6 \, \text{m/s} \)?

Q7. In a hydrogen atom, the total energy of the electron in the ground state is -13.6 eV. What is its kinetic energy?

Q8. What limitation of Bohr’s model prevents it from explaining the spectrum of helium?

Q9. What is the energy of a photon emitted when an electron drops from \( n = 5 \) to \( n = 4 \) in a hydrogen atom? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

Q10. In Rutherford’s nuclear model, why do most alpha-particles pass through the gold foil without deflection?

NEET Physics — Atoms and Nuclei

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An electron beam of 12.0 eV excites a hydrogen atom in the ground state. What is the highest energy level reached? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

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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 Electron, Hydrogen, Parameter, Rutherford, Particle, 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. An electron beam of 12.0 eV excites a hydrogen atom in the ground state. What is the highest energy level reached? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

  • A. 3
  • B. 4
  • C. 1
  • D. 2

Q2. What is the role of the impact parameter in Rutherford’s alpha-particle scattering?

  • A. Measures the energy of alpha-particles
  • B. Determines the scattering angle
  • C. Indicates the size of the foil
  • D. Controls the speed of alpha-particles

Q3. Which of the following statements is incorrect about de Broglie’s explanation of Bohr’s model?

  • A. Electrons form standing waves in orbits
  • B. Circumference is an integer multiple of wavelength
  • C. Electrons emit continuous waves
  • D. Quantization arises from wave nature

Q4. The radius of the first orbit in a hydrogen atom is \( 5.3 \times 10^{-11} \, \text{m} \). What is the radius of the fifth orbit?

  • A. \( 1.325 \times 10^{-9} \, \text{m} \)
  • B. \( 2.12 \times 10^{-10} \, \text{m} \)
  • C. \( 4.77 \times 10^{-10} \, \text{m} \)
  • D. \( 8.48 \times 10^{-10} \, \text{m} \)

Q5. In the Bohr model, what is the ratio of the radius of the \( n = 5 \) orbit to the \( n = 1 \) orbit?

  • A. 9
  • B. 16
  • C. 25
  • D. 4

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