Dual Nature of Radiation and Matter MCQs Class 12
Dual Nature of Radiation & Matter MCQs
Class: CBSE Class 12
Subject: Physics
Section: Dual Nature of Radiation & Matter
Topic: Dual Nature of Radiation and Matter
Based on: CBSE Board Examination Pattern (NCERT)
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Photoelectric effect supports the ______ nature of light.
Answer: B
Emission of electrons occurs due to photons, proving particle nature.
Emission of electrons occurs due to photons, proving particle nature.
2. Einstein received Nobel Prize for explaining:
Answer: B
He explained photoelectric emission using photon theory.
He explained photoelectric emission using photon theory.
3. Energy of photon is:
Answer: A
E = hν where h is Planck’s constant.
E = hν where h is Planck’s constant.
4. Threshold frequency depends on:
Answer: B
It is a property of the material.
It is a property of the material.
5. Stopping potential measures:
Answer: B
It determines maximum kinetic energy of electrons.
It determines maximum kinetic energy of electrons.
6. Increasing intensity increases:
Answer: B
More photons → more emitted electrons.
More photons → more emitted electrons.
7. de Broglie wavelength is:
Answer: A
λ = h/p shows wave nature of matter.
λ = h/p shows wave nature of matter.
8. Electron diffraction proves:
Answer: B
Diffraction is a wave phenomenon.
Diffraction is a wave phenomenon.
9. Work function unit:
Answer: A
Minimum energy required to eject electron.
Minimum energy required to eject electron.
10. Photoelectric emission is instantaneous because:
Answer: B
Energy transfer occurs in single photon collision.
Energy transfer occurs in single photon collision.
11. KE of electrons depends on:
Answer: B
Higher frequency → higher photon energy.
Higher frequency → higher photon energy.
12. Planck constant unit:
Answer: A
h = 6.626×10⁻³⁴ J·s.
h = 6.626×10⁻³⁴ J·s.
13. Dual nature applies to:
Answer: C
Both show wave–particle duality.
Both show wave–particle duality.
14. Larger mass → de Broglie wavelength:
Answer: B
λ ∝ 1/p, so heavier objects have negligible wavelength.
λ ∝ 1/p, so heavier objects have negligible wavelength.
15. Photocurrent depends on:
Answer: A
Higher intensity emits more electrons.
Higher intensity emits more electrons.
16. Stopping potential increases with:
Answer: B
Higher frequency → greater KE.
Higher frequency → greater KE.
17. Photon momentum is:
Answer: A
p = h/λ.
p = h/λ.
18. Wave nature of electrons shown by:
Answer: A
Electron diffraction confirmed matter waves.
Electron diffraction confirmed matter waves.
19. Minimum energy to remove electron:
Answer: B
Defined as work function φ.
Defined as work function φ.
20. If ν < ν₀, photoelectric emission:
Answer: B
Frequency must exceed threshold value.
Frequency must exceed threshold value.