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CBSE Class 11 Chemistry MCQs – Photoelectric Effect and de Broglie Concept Practice Test
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📚 Introduction Paragraph
The Photoelectric Effect and de Broglie Concept form a cornerstone of Chapter 2: Structure of Atom in CBSE Class 11 Chemistry. These topics mark the transition from classical to quantum theory, explaining how light and matter exhibit both wave and particle characteristics. The photoelectric effect, explained by Albert Einstein, shows that light consists of energy quanta called photons, while Louis de Broglie’s hypothesis introduced the concept of matter waves, revolutionizing atomic theory.
This online MCQ practice test is designed strictly as per the NCERT Class 11 Chemistry syllabus, making it ideal for CBSE board exam preparation, as well as entrance tests like JEE Main and NEET. The questions test your understanding of photon energy, threshold frequency, de Broglie wavelength, and their mathematical relationships.
By practicing these Photoelectric Effect and de Broglie Concept MCQs, students strengthen conceptual clarity, enhance problem-solving skills, and gain deeper insight into the quantum behavior of light and matter.
🧩 Sample MCQs (with Answers & Explanations):
Q1. Who proposed that particles like electrons have wave properties?
A. Planck B. Bohr C. de Broglie D. Einstein
✅ Answer: C
💡 Explanation: Louis de Broglie proposed that matter exhibits wave-like behavior, with wavelength λ = h/p.
Q2. The photoelectric effect provided experimental proof for the ______ nature of light.
A. Wave B. Dual C. Particle D. Magnetic
✅ Answer: C
💡 Explanation: The photoelectric effect proved that light behaves as discrete photons with quantized energy (E = hν).
Q3. Which equation represents the energy of a photon?
A. E = mc² B. E = hν C. E = ½mv² D. E = hcλ
✅ Answer: B
💡 Explanation: Planck’s equation (E = hν) defines photon energy in terms of its frequency.
Q4. If the frequency of incident light is doubled, the kinetic energy of emitted electrons will:
A. Double B. Remain constant C. Increase linearly D. Decrease
✅ Answer: C
💡 Explanation: As per Einstein’s photoelectric equation, KE = hν − φ, so KE increases linearly with frequency.
Q5. The de Broglie wavelength of an electron is inversely proportional to its:
A. Mass B. Velocity C. Momentum D. Charge
✅ Answer: C
💡 Explanation: From the de Broglie equation (λ = h/p), wavelength is inversely proportional to momentum.