NEET Physics: Atoms and Nuclei — MCQ Test 11

Q6. In the Bohr model, how many de Broglie wavelengths fit into the circumference of the \( n = 5 \) orbit?

Q7. Which of the following statements is incorrect about Thomson’s model?

Q8. What does the absorption spectrum of a hydrogen atom reveal?

Q9. An electron in a hydrogen atom has a total energy of -3.4 eV. What is its kinetic energy?

Q10. The kinetic energy of an alpha-particle is 7.7 MeV. If it approaches a nucleus with atomic number 79, what is its distance of closest approach? (Use constants: \( \frac{1}{4\pi\epsilon_0} = 9 \times 10^9 \, \text{N·m}^2/\text{C}^2 \), \( e = 1.6 \times 10^{-19} \, \text{C} \), 1 MeV = \( 1.6 \times 10^{-13} \, \text{J} \))

NEET Physics — Atoms and Nuclei

Free MCQ Test 11 of 22

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In the Bohr model, what is the ratio of the kinetic energy of an electron in the \( n = 2 \) state to that in the \( n = 1 \) state?

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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, Difference, Hydrogen, Wavelengths, Circumference, and Following.

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. In the Bohr model, what is the ratio of the kinetic energy of an electron in the \( n = 2 \) state to that in the \( n = 1 \) state?

  • A. 2
  • B. 0.5
  • C. 0.25
  • D. 4

Q2. What is the orbital period of an electron in the \( n = 3 \) orbit if \( v_1 = 2.2 \times 10^6 \, \text{m/s} \) and \( r_1 = 5.3 \times 10^{-11} \, \text{m} \)?

  • A. \( 1.51 \times 10^{-16} \, \text{s} \)
  • B. \( 1.21 \times 10^{-15} \, \text{s} \)
  • C. \( 6.05 \times 10^{-16} \, \text{s} \)
  • D. \( 4.09 \times 10^{-15} \, \text{s} \)

Q3. What is the energy difference between the \( n = 4 \) and \( n = 2 \) states in a hydrogen atom? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

  • A. 1.89 eV
  • B. 2.55 eV
  • C. 0.66 eV
  • D. 12.75 eV

Q4. What is the speed of an electron in the \( n = 5 \) orbit of a hydrogen atom if its speed in \( n = 1 \) is \( 2.2 \times 10^6 \, \text{m/s} \)?

  • A. \( 5.5 \times 10^5 \, \text{m/s} \)
  • B. \( 4.4 \times 10^5 \, \text{m/s} \)
  • C. \( 7.33 \times 10^5 \, \text{m/s} \)
  • D. \( 1.1 \times 10^6 \, \text{m/s} \)

Q5. What is the kinetic energy of an electron in the \( n = 4 \) state of a hydrogen atom? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

  • A. 0.85 eV
  • B. 1.51 eV
  • C. 3.4 eV
  • D. 0.544 eV

+ 5 more questions in the actual test

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