Dawn of Modern Physics MCQs for MDCAT Practice

Physics section, Dawn of Modern Physics chapter. Sample questions from past PMC papers.

1. Question 1
   de Broglie wavelength of moving cricket ball is not noticed due to:
   • A.Low mass
   • B.High speed
   • C.Time delay
   • D.Low Speed
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2. Question 2
   For black body, the energy of emitted thermal radiations depends on:
   • A.Temperature
   • B.Material
   • C.Nature of substance
   • D.All of them
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3. Question 3
   λ is proportional to
   • A.1/E for both photons and particles
   • B.1/E for photons and 1/√E for particles
   • C.1/√E for both photons and particles
   • D.1/√E for photons and 1/E for particles
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4. Question 4
   Plank׳s constant is analogus to:
   • A.Inertia
   • B.Wave nature
   • C.Angular momentum
   • D.Linear momentum
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5. Question 5
   When light of suitable frequency falls on a metal surface and electrons are emitted from the surface, the phenomenon is called
   • A.Pair production
   • B.Compton effect
   • C.Photoelectric effect
   • D.Zeeman effect
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6. Question 6
   Which of the following experiments prove the particle nature of light?
   • A.Interference
   • B.Diffraction
   • C.Reflection
   • D.Photoelectric effect
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7. Question 7
   The process of pair production is also known as:
   • A.Compton effect
   • B.Photoelectric effect
   • C.Materialization of energy
   • D.None of these
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8. Question 8
   Rdiations are always emitted or absorbed in the form of packets of energy. This is the statement of:
   • A.Rayleigh-Jean’s law
   • B.Wein’s displacement law
   • C.Stefan’s law
   • D.Planck’s quantum law
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