Class 12 Physics MCQ Chapter 11 Dual Nature of Radiation and Matter
Dive into the fascinating world of modern physics with our Class 12 Physics MCQ Chapter 11 Dual Nature of Radiation and Matter English Medium collection. This article features a carefully selected set of multiple-choice questions (MCQs) with answers, designed specifically for AHSEC Higher Secondary students preparing for board examinations.
The chapter Dual Nature of Radiation and Matter explores revolutionary concepts that transformed our understanding of physics. Students will learn about the particle nature of light, photoelectric effect, Einstein’s photoelectric equation, photons, de Broglie’s hypothesis, matter waves, and the wave-particle duality of matter and radiation. These topics form the foundation of quantum physics and are among the most important sections of the Class 12 syllabus.
All MCQs are prepared in accordance with the latest AHSEC syllabus and examination pattern. These objective questions help students revise key concepts, improve conceptual clarity, and gain familiarity with the types of questions commonly asked in examinations. Regular practice can significantly enhance confidence and problem-solving abilities.
Whether you are preparing for unit tests, model papers, or the AHSEC Higher Secondary Final Examination, these Chapter 11 MCQ solutions will help you strengthen your understanding of modern physics and achieve better results.
PART II
Class 12 Physics MCQ Chapter 11 Dual Nature of Radiation and Matter
VSA & MCQ
I. Very Short Answer Questions
Q. What is dual nature of radiation?
Ans: Light shows both wave and particle nature.
Q. What is photon?
Ans: Photon is a packet of energy of electromagnetic radiation.
Q. What is energy of photon?
Ans: E = hν.
Q. What is Planck’s constant?
Ans: h = 6.626 × 10⁻³⁴ J·s.
Q. What is photoelectric effect?
Ans: Emission of electrons when light falls on a metal.
Q. What is threshold frequency?
Ans: Minimum frequency required to emit electrons.
Q. What is work function?
Ans: Minimum energy needed to remove an electron.
Q. Write Einstein’s photoelectric equation.
Ans: hν = φ + K_max.
Q. What is stopping potential?
Ans: Potential required to stop photoelectrons.
Q. What is de Broglie hypothesis?
Ans: Matter has wave nature.
Q. What is de Broglie wavelength?
Ans: λ = h / p.
Q. What is momentum of photon?
Ans: p = h / λ.
Q. What is intensity of light?
Ans: Number of photons per unit area per second.
Q. What is saturation current?
Ans: Maximum current in photoelectric effect.
Q. What is cut-off potential?
Ans: Same as stopping potential.
Q. What is emission dependent on frequency?
Ans: Kinetic energy.
Q. What is emission dependent on intensity?
Ans: Number of electrons.
Q. What is Compton effect?
Ans: Scattering of photons with change in wavelength.
Q. What is Compton shift?
Ans: Δλ = (h / mc)(1 − cosθ).
Q. What is wave-particle duality?
Ans: Matter behaves as wave and particle.
Q. What is electron diffraction?
Ans: Evidence of wave nature of electrons.
Q. What is mass-energy relation?
Ans: E = mc².
Q. What is frequency of photon?
Ans: ν = c / λ.
Q. What is relation between energy and wavelength?
Ans: E = hc / λ.
Q. What is nature of photoelectric emission?
Ans: Instantaneous.
Q. What is binding energy?
Ans: Energy required to remove electron.
Q. What is photon mass?
Ans: Zero rest mass.
Q. What is particle nature shown by?
Ans: Photoelectric effect.
Q. What is wave nature shown by?
Ans: Interference and diffraction.
Q. What is electron wavelength relation?
Ans: λ = h / mv.
II. Multiple Choice Questions
Q. Photon energy is:
(a) h/ν
(b) hν
(c) ν/h
(d) hv²
Ans: (b)
Q. Photoelectric effect proves:
(a) Wave nature
(b) Particle nature
(c) Both
(d) None
Ans: (b)
Q. Threshold frequency depends on:
(a) Intensity
(b) Material
(c) Voltage
(d) Current
Ans: (b)
Q. Work function unit is:
(a) Joule
(b) Volt
(c) Ampere
(d) Ohm
Ans: (a)
Q. de Broglie wavelength is:
(a) h/p
(b) p/h
(c) hv
(d) v/h
Ans: (a)
Q. Stopping potential depends on:
(a) Intensity
(b) Frequency
(c) Area
(d) Time
Ans: (b)
Q. Saturation current depends on:
(a) Frequency
(b) Intensity
(c) Voltage
(d) Material
Ans: (b)
Q. Compton effect shows:
(a) Wave nature
(b) Particle nature
(c) Both
(d) None
Ans: (b)
Q. Photon momentum is:
(a) hλ
(b) h/λ
(c) λ/h
(d) hv
Ans: (b)
Q. Electron diffraction proves:
(a) Particle nature
(b) Wave nature
(c) Both
(d) None
Ans: (b)
Q. Assertion: Photoelectric emission is instantaneous. Reason: Energy is absorbed continuously over time.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (c)
Q. Assertion: Increasing intensity increases kinetic energy. Reason: Kinetic energy depends on frequency.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (d)
Q. Assertion: de Broglie wavelength decreases with momentum. Reason: λ = h/p.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Compton effect proves particle nature of light. Reason: Photons have momentum.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Threshold frequency depends on material. Reason: Work function varies with material.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Stopping potential depends on intensity. Reason: More electrons require more stopping voltage.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (d)
Q. Assertion: Electron shows wave nature. Reason: It produces diffraction pattern.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
