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Dawn of Modern Physics MCQs for MDCAT Practice

Physics section, Dawn of Modern Physics chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 1,239 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    de Broglie wavelength of moving cricket ball is not noticed due to:
    • Low mass
    • High speed
    • Time delay
    • Low Speed (correct answer)
    Correct answer: D
    The de Broglie wavelength of macroscopic objects like cricket balls is imperceptible due to their large mass and momentum, making the wavelength extremely small.
  2. Question 2
    For black body, the energy of emitted thermal radiations depends on:
    • Temperature (correct answer)
    • Material
    • Nature of substance
    • All of them
    Correct answer: A
    Black body radiation intensity and spectrum are solely dictated by its temperature, not its material composition.
  3. Question 3
    λ is proportional to
    • 1/E for both photons and particles
    • 1/E for photons and 1/√E for particles (correct answer)
    • 1/√E for both photons and particles
    • 1/√E for photons and 1/E for particles
    Correct answer: B
    This question tests the de Broglie wavelength and photon energy-momentum relationships, differentiating between wave-particle duality for photons and matter waves.
  4. Question 4
    Plank׳s constant is analogus to:
    • Inertia
    • Wave nature
    • Angular momentum (correct answer)
    • Linear momentum
    Correct answer: C
    Plank's constant (h) quantifies energy packets and is analogous to angular momentum (L), representing fundamental discrete units in quantum mechanics.
  5. Question 5
    When light of suitable frequency falls on a metal surface and electrons are emitted from the surface, the phenomenon is called
    • Pair production
    • Compton effect
    • Photoelectric effect (correct answer)
    • Zeeman effect
    Correct answer: C
    This question tests your understanding of the photoelectric effect, where light energy ejects electrons from a metal surface.
  6. Question 6
    Which of the following experiments prove the particle nature of light?
    • Interference
    • Diffraction
    • Reflection
    • Photoelectric effect (correct answer)
    Correct answer: D
    The photoelectric effect is the definitive experiment showcasing light's particle nature (photons), unlike wave phenomena like interference, diffraction, and reflection.
  7. Question 7
    The process of pair production is also known as:
    • Compton effect
    • Photoelectric effect
    • Materialization of energy (correct answer)
    • None of these
    Correct answer: C
    Pair production is the conversion of energy into matter, specifically an electron-positron pair. This process is also termed materialization of energy, contrasting with particle interactions like the photoelectric or Compton effects.
  8. Question 8
    Rdiations are always emitted or absorbed in the form of packets of energy. This is the statement of:
    • Rayleigh-Jean’s law
    • Wein’s displacement law
    • Stefan’s law
    • Planck’s quantum law (correct answer)
    Correct answer: D
    The quantization of energy emission/absorption, a cornerstone of modern physics, is precisely stated by Planck's quantum law.

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