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Physics - Dual Nature of Matter

Practise 25 WBJEE previous year questions on Dual Nature of Matter, compiled from papers spanning 2012 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 WBJEE tests.

Dual Nature of Matter has been asked in 14 of the 18 years of WBJEE papers analysed (2009–2026), with 25 questions in all. 24% of them were easy, 68% moderate and 8% tough. Most of its questions came from 2016, with 3 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.

The chapter's 2 topics are not weighted equally: Photoelectric Effect (16 questions, 64%) and Matter Waves (9 questions, 36%) have been asked the most. Photoelectric Effect has also led over the last five years, with 4 questions. Photoelectric Effect has produced the most tough questions (2).

  1. 1Radiation of wavelength is incident on a photocell. The fastest emitted electron has speed . If the wavelength is changed to , then the spee2026Photoelectric Effect
  2. 2The de-Broglie wavelength of a moving bus with speed is is . Some passengers left the bus at a stoppage. Now when the bus moves with twice o2025Matter Waves
  3. 3photons of wavelength 660 nm are emitted per second from a lamp. The wattage of the lamp is (Planck's constant2025Photoelectric Effect
  4. 4A beam of light of wavelength falls on a metal having work function placed in a magnetic field . The most energetic electrons, perpendicular2024Photoelectric Effect
  5. 5Monochromatic light of wavelength is incident separately on the surface of four different metals and D. The work functions of and D are and 2024Photoelectric Effect
  6. 6If the kinetic energies of an electron, an alpha particle and a proton having same de-Broglie wavelength are and respectively, then2022Matter Waves
  7. 7Electric field component of an EM radiation varies with time as , where ' ' is a constant and . This radiation falls on a metal whose stoppi2021Photoelectric Effect
  8. 8A point source of light is used in an experiment of photo-electric effects. If the distance between the source and the photo-electric surfac2020Photoelectric Effect
  9. 9A proton and an electron initially at rest are accelerated by the same potential difference. Assuming that a proton is 2000 times heavier th2019Matter Waves
  10. 10Electrons are emitted with kinetic energy from a metal plate by an irradiation of light of intensity and frequency v. Then, which of the fol2019Photoelectric Effect
  11. 11An electron accelerated through a potential of from rest has a de-Broglie wave length . What should be the accelerating potential, so that t2018Matter Waves
  12. 12The de-Broglie wavelength of an electron is when its kinetic energy is Its wavelength will be when its kinetic energy is2017Matter Waves
  13. 13When light of frequency is incident on a metal with work function (where ), then photocurrent falls to zero at a stopping potential of . If 2017Photoelectric Effect
  14. 14The potential difference required for accelerating an electron to have the de-Broglie wavelength of is2016Matter Waves
  15. 15The work function of Cesium is . The cut-off voltage which stops the emission of electrons from a cesium cathode irradiated with light of wa2016Photoelectric Effect
  16. 16The distance between a light source and photoelectric cell is d. If the distance is decreased to then2016Photoelectric Effect
  17. 17A photon of wavelength 300 nm interacts with a stationary hydrogen atom in ground state. During the interaction, whole energy the photon is 2015Photoelectric Effect
  18. 18The work function of metals is in the range of to . Find which of the following wavelength of light cannot be used for photoelectric effect?2015Photoelectric Effect
  19. 19Consider two particles of different masses, In which of the following situations the heavier of the two particles will have smaller de-Brogl2015Matter Waves
  20. 20The de-Broglie wavelength of an electron is the same as that of a X-ray photon. The ratio of the energy of the photon to the kinetic energy 2014Photoelectric Effect
  21. 21Find the correct statement(s) about photoelectric effect.2014Photoelectric Effect
  22. 22The de-Broglie wavelength of an electron (mass charge with a kinetic energy of is (Planck's constant2013Matter Waves
  23. 23The stopping potential for photoelectrons from a metal surface is when monochromatic light of frequency is incident on it. The stopping pote2013Photoelectric Effect
  24. 24The de-Broglie wavelength of an electron moving with a velocity ( velocity of light in vacuum) is equal to the wavelength of a photon. The r2012Matter Waves
  25. 25When a certain metal surface is illuminated with light of frequency , the stopping potential for photoelectric current is . When the same su2012Photoelectric Effect

Frequently Asked Questions

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

This chapter includes 25 questions compiled from WBJEE papers spanning 2012 to 2026.

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

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

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

Dual Nature of Matter has appeared in 14 of the 18 years of WBJEE papers covered here, with 25 questions across 14 papers - about 2 per paper it appears in.

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

Of the 25 questions analysed for this chapter, 24% are easy, 68% moderate and 8% tough. 2016 had the most, with 3 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 - 16 questions (64%)
  • Matter Waves - 9 questions (36%)
  • Photoelectric Effect has produced the most tough questions (2).
6.Is Dual Nature of Matter's weightage in WBJEE going up or down?

Across all 14 papers analysed, Dual Nature of Matter has averaged about 1.8 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.