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Physics - Dual Nature of Matter

Practise 207 JEE Main previous year questions on Dual Nature of Matter, compiled from papers spanning 2002 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Dual Nature of Matter has been asked in 25 of the 25 years of JEE Main papers analysed (2002–2026), with 207 questions in all. 44% of them were easy, 46% moderate and 10% tough. Most of its questions came from 2021, with 30 questions that year. In the last three years (2024–2026) it had 47 questions across 49 papers, about 1 per paper.

The chapter's 4 topics are not weighted equally: Photoelectric Effect (111 questions, 54%), Matter Waves (85 questions, 41%), and Davison and Germer Experiment (10 questions, 5%) have been asked the most. Photoelectric Effect has also led over the last five years, with 61 questions. Photoelectric Effect has produced the most tough questions (11).

  1. 1and be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength and , respectiv08 Apr, 2026 (E)Photoelectric Effect
  2. 2The de Broglie wavelength for an electron accelerated through the potential difference of volt is . When the potential difference is changed06 Apr, 2026 (E)Matter Waves
  3. 3An electron of mass is moving in an electric field ( constant ), with an initial velocity ( constant ). If , its de Broglie wavelength at ti05 Apr, 2026 (M)Matter Waves
  4. 4Light source having wavelength nm is used to generate photo-electrons whose stopping potential is V. The work function of the used metal in 05 Apr, 2026 (M)Photoelectric Effect
  5. 5Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The electromagnetic05 Apr, 2026 (E)Photoelectric Effect
  6. 6An electron is travelling with a velocity in free space and when it enters a medium, its velocity is reduced by . The de Broglie wavelength 05 Apr, 2026 (E)Matter Waves
  7. 7The graph shows variation of stopping potential with the frequency of the incident radiation for three photosensitive metals , and . Which m04 Apr, 2026 (M)Photoelectric Effect
  8. 8Match the LIST-I with LIST-II List-I List-II A. Planck's constant I. B. Stopping potential II. C. Work function III. D. Threshold frequency 04 Apr, 2026 (E)Photoelectric Effect
  9. 9The de Broglie wavelength associated with an electron accelerated through a potential difference V is and the de Broglie wavelength associat04 Apr, 2026 (E)Matter Waves
  10. 10For a certain metal, when monochromatic light of wavelength is incident, the stopping potential for photoelectrons is . When the same metal 02 Apr, 2026 (M)Photoelectric Effect
  11. 11The ratio of de Broglie wavelength of a deutron with kinetic energy to that of an alpha particle with kinetic energy , is . The value of is 28 Jan, 2026 (M)Matter Waves
  12. 12Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is . (Given : and )28 Jan, 2026 (E)Photoelectric Effect
  13. 13When a light of a given wavelength falls on a metallic surface the stopping potential for photoelectrons is 3.2 V. If a second light having 24 Jan, 2026 (E)Photoelectric Effect
  14. 14The de Broglie wavelength of an oxygen molecule at is . The value of is (take Planck's constant , Boltzmann constant , mass of oxygen molecu23 Jan, 2026 (M)Matter Waves
  15. 15Light is incident on a metallic plate having work function . If the produced photoelectrons have zero kinetic energy then the angular freque22 Jan, 2026 (E)Photoelectric Effect
  16. 16A light wave described by (in SI units) falls on a metal surface of work function 2.8 eV. The maximum kinetic energy of ejected photoelectro21 Jan, 2026 (M)Photoelectric Effect
  17. 17A particle having electric charge and mass is accelerated by applying an electric potential of 1.21 V. Wavelength of the matter wave associa21 Jan, 2026 (E)Matter Waves
  18. 18A photo-emissive substance is illuminated with a radiation of wavelength so that it releases electrons with de-Broglie wavelength . The long07 Apr, 2025 (E)Matter Waves
  19. 19Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason Assertion A: In photoelectric effect, on 04 Apr, 2025 (M)Photoelectric Effect
  20. 20A small mirror of mass is suspended by a massless thread of length . Then the small angle through which the thread will be deflected when a 04 Apr, 2025 (M)Photoelectric Effect
  21. 21The radiation pressure exerted by a 450 W light source on a perfectly reflecting surface placed at 2 m away from it, is :03 Apr, 2025 (M)Photoelectric Effect
  22. 22The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons is03 Apr, 2025 (M)Photoelectric Effect
  23. 23A monochromatic light is incident on a metallic plate having work function . An electron, emitted normally to the plate from a point with ma02 Apr, 2025 (M)Photoelectric Effect
  24. 24An electron with mass ' ' with an initial velocity enters a magnetic field . If the initial de-Broglie wavelength at is then its value after02 Apr, 2025 (E)Matter Waves
  25. 25If \( \) and \(K\) are de Broglie wavelength and kinetic energy, respectively, of a particle with constant mass. The correct graphical repre29 Jan, 2025 (M)Matter Waves
  26. 26In an experiment with photoelectric effect, the stopping potential,29 Jan, 2025 (E)Photoelectric Effect
  27. 27A proton of mass ' ' has same energy as that of a photon of wavelength ' '. If the proton is moving at non-relativistic speed, then ratio of28 Jan, 2025 (M)Matter Waves
  28. 28An electron of mass ' m ' with an initial velocity enters an electric field . If the initial de Broglie wavelength is , the value after time24 Jan, 2025 (M)Matter Waves
  29. 29In photoelectric effect, the stopping potential frequency curve is plotted. ( h is the Planck's constant and is work function of metal ) (A)24 Jan, 2025 (E)Photoelectric Effect
  30. 30The energy and momentum of a moving body of mass are related by some equation. Given that c represents the speed of light, identify the corr24 Jan, 2025 (E)Matter Waves
  31. 31A sub-atomic particle of mass is moving with a velocity . Under the matter wave consideration, the particle will behave closely like23 Jan, 2025 (M)Matter Waves
  32. 32In photoelectric effect an em-wave is incident on a metal surface and electrons are ejected from the surface. If the work function of the me23 Jan, 2025 (E)Photoelectric Effect
  33. 33An electron in the ground state of the hydrogen atom has the orbital radius of while that for the electron in third excited state is . The r22 Jan, 2025 (M)Matter Waves
  34. 34The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV , respectively. If we incident a light of wavelength 550 nm 22 Jan, 2025 (M)Photoelectric Effect
  35. 35A light source of wavelength illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface22 Jan, 2025 (E)Photoelectric Effect
  36. 36A proton, an electron and an alpha particle have the same energies. Their de-Broglie wavelengths will be compared as :09 Apr, 2024 (M)Matter Waves
  37. 37UV light of is incident on a photosensitive metal surface having work function . The maximum kinetic energy of ejected photoelectrons will b09 Apr, 2024 (E)Photoelectric Effect
  38. 38A proton and an electron are associated with same de-Broglie wavelength. The ratio of their kinetic energies is: (Assume h=6.63 and times )08 Apr, 2024 (M)Matter Waves
  39. 39Average force exerted on a non-reflecting surface at normal incidence is . If is the light energy flux during span of 1 hour 30 minutes, The08 Apr, 2024 (M)Photoelectric Effect
  40. 40A proton and an electron have the same de Broglie wavelength. If and be the kinetic energies of proton and electron respectively, then choos08 Apr, 2024 (E)Matter Waves
  41. 41In photoelectric experiment energy of irradiates a photo sensitive material. The stopping potential was measured to be . Work function of th06 Apr, 2024 (M)Photoelectric Effect
  42. 42Which of the following phenomena does not explain by wave nature of light. A. reflection B. diffraction C. photoelectric effect D. interfere06 Apr, 2024 (M)Photoelectric Effect
  43. 43When UV light of wavelength is incident on the metal surface having work function , electron emission takes place. The stopping potential is06 Apr, 2024 (E)Photoelectric Effect
  44. 44Given below are two statements : Statement I : Figure shows the variation of stopping potential with frequency for the two photosensitive ma05 Apr, 2024 (M)Photoelectric Effect
  45. 45Which of the following statement is not true about stopping potential ?05 Apr, 2024 (E)Photoelectric Effect
  46. 46Which figure shows the correct variation of applied potential difference (V) with photoelectric current (I) at two different intensities of 04 Apr, 2024 (M)Photoelectric Effect
  47. 47Given below are two statements: one is labelled as Assertion and the other is labelled as Reason R. Assertion A: Number of photons increases04 Apr, 2024 (E)Photoelectric Effect
  48. 48The de Broglie wavelengths of a proton and an α particle are λ and 2 λ respectively. The ratio of the velocities of proton and α particle wi01 Feb, 2024 (M)Matter Waves
  49. 49Monochromatic light of frequency 6 × 10 14 Hz is produced by a laser. The power emitted is 2 × 10 - 3 W . How many photons per second on an 01 Feb, 2024 (E)Photoelectric Effect
  50. 50When a metal surface is illuminated by light of wavelength λ , the stopping potential is 8 V . When the same surface is illuminated by light31 Jan, 2024 (M)Photoelectric Effect

Frequently Asked Questions

1.How many questions are available for Dual Nature of Matter?

This chapter includes 207 questions compiled from JEE Main papers spanning 2002 to 2026.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Dual Nature of Matter chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Dual Nature of Matter an important chapter for JEE Main Physics?

Dual Nature of Matter has appeared in 25 of the 25 years of JEE Main papers covered here, with 207 questions across 177 papers - about one per paper it appears in.

4.What is the difficulty level of Dual Nature of Matter questions in JEE Main?

Of the 207 questions analysed for this chapter, 44% are easy, 46% moderate and 10% tough. 2021 had the most, with 30 questions.

5.Which topics in Dual Nature of Matter should I focus on?

These topics have carried the most weightage in Dual Nature of Matter:

  • Photoelectric Effect - 111 questions (54%)
  • Matter Waves - 85 questions (41%)
  • Davison and Germer Experiment - 10 questions (5%)
  • Photoelectric Effect has produced the most tough questions (11).
6.Is Dual Nature of Matter's weightage in JEE Main going up or down?

Across all 177 papers analysed, Dual Nature of Matter has averaged about 1.2 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.