NEET Physics: Atoms and Nuclei — MCQ Test 4

Q6. Why did Rutherford’s nuclear model fail to explain the stability of atoms?

Q7. What is the orbital period of an electron in the \( n = 2 \) orbit of a hydrogen atom if \( v_1 = 2.2 \times 10^6 \, \text{m/s} \) and \( r_1 = 5.3 \times 10^{-11} \, \text{m} \)?

Q8. A photon of energy 10.2 eV is absorbed by a hydrogen atom in the ground state. To which energy level does the electron jump? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

Q9. What is the potential energy of an electron in the \( n = 5 \) state of a hydrogen atom? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

Q10. In an alpha-particle scattering experiment, a 5.5 MeV alpha-particle approaches a gold nucleus (Z = 79). What is the approximate distance of closest approach? (Take \( \frac{1}{4\pi\epsilon_0} = 9 \times 10^9 \, \text{N·m}^2/\text{C}^2 \), \( e = 1.6 \times 10^{-19} \, \text{C} \), 1 MeV = \( 1.6 \times 10^{-13} \, \text{J} \))

NEET Physics — Atoms and Nuclei

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Which of the following statements is incorrect about the hydrogen atom’s energy levels in Bohr’s model?

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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 Following, Statements, Incorrect, Hydrogen, 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. Which of the following statements is incorrect about the hydrogen atom’s energy levels in Bohr’s model?

  • A. Energy is negative in bound states
  • B. Energy levels are discrete
  • C. Energy is positive in all orbits
  • D. Energy approaches zero as \( n \) increases

Q2. In Rutherford’s scattering experiment, what percentage of alpha-particles scatter by more than 1°?

  • A. 1.4%
  • B. 0.14%
  • C. 0.014%
  • D. 14%

Q3. What is the orbital period 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. \( 1.0 \times 10^{-16} \, \text{s} \)
  • B. \( 1.2 \times 10^{-16} \, \text{s} \)
  • C. \( 1.8 \times 10^{-16} \, \text{s} \)
  • D. \( 1.51 \times 10^{-16} \, \text{s} \)

Q4. What is the angular momentum of an electron in the \( n = 2 \) 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. \( 3.15 \times 10^{-34} \, \text{J·s} \)
  • C. \( 2.1 \times 10^{-34} \, \text{J·s} \)
  • D. \( 4.2 \times 10^{-34} \, \text{J·s} \)

Q5. What does the line spectrum of hydrogen indicate about its atomic structure?

  • A. Continuous energy distribution
  • B. Discrete energy levels
  • C. Uniform charge distribution
  • D. Random electron motion

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