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Physics - Dual Nature of Matter

Practise 51 KCET previous year questions on Dual Nature of Matter, compiled from papers spanning 2007 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 KCET tests.

Dual Nature of Matter has been asked in 20 of the 20 years of KCET papers analysed (2007–2026), with 51 questions in all. 63% of them were easy, 29% moderate and 8% tough. Most of its questions came from 2021, with 4 questions that year. In the last three years (2024–2026) it had 7 questions across 3 papers, about 2.3 per paper.

The chapter's 2 topics are not weighted equally: Photoelectric Effect (29 questions, 57%) and Matter Waves (22 questions, 43%) have been asked the most. Photoelectric Effect has also led over the last five years, with 9 questions. Photoelectric Effect has produced the most tough questions (2).

  1. 1Work function of the metal is2026Photoelectric Effect
  2. 2Variation of photoelectric current with anode potential is shown below. Choose the correct option ( = stopping potential)2026Photoelectric Effect
  3. 3If we consider an electron and a photon of same de-Broglie wavelength, then they will have same2025Matter Waves
  4. 4The anode voltage of a photocell is kept fixed. The frequency of the light falling on the cathode is gradually increased. Then the correct g2025Photoelectric Effect
  5. 5A galaxy is moving away from the Earth so that a spectral line at 600 nm is observed at 601 nm . Then, the speed of the galaxy with respect 2024Matter Waves
  6. 6Light of energy falls normally on a metal of work function . The kinetic energies of the photo electrons are2024Photoelectric Effect
  7. 7The photoelectric work function for photo metal is 2.4 eV . Among the four wavelengths, the wavelength of light for which photoemission does2024Photoelectric Effect
  8. 8A source emits monochromatic light of wavelength . The number of photons emitted per second is2023Photoelectric Effect
  9. 9In an experiment to study photoelectric effect the observed variation of stopping potential with frequency of incident radiation is as shown2023Photoelectric Effect
  10. 10The kinetic energy of the photoelectrons increases by when the wavelength of incident light is changed from to another wavelength which is a2022Photoelectric Effect
  11. 11The de-Broglie wavelength of a particle of kinetic energy is , the wavelength of the particle, if its kinetic energy is2022Matter Waves
  12. 12In a photo electric experiment, if both the intensity and frequency of the incident light are doubled, then the saturation photoelectric cur2022Photoelectric Effect
  13. 13The work-function of a metal is . Light of wavelength is incident on this metal surface. The velocity of emitted photoelectrons will be2021Photoelectric Effect
  14. 14A proton moving with a momentum has a kinetic energy th of its rest mass-energy. Another light photon having energy equal to the kinetic ene2021Matter Waves
  15. 15According to Einstein's photoelectric equation to the graph between kinetic energy of photoelectrons ejected and the frequency of incident r2021Photoelectric Effect
  16. 16The figure shows standing de-Broglie waves due to the revolution of electron in a certain orbit of hydrogen atom. Then, the expression for t2021Matter Waves
  17. 17A hot filament liberates an electron with zero initial velocity. The anode potential is . The speed of the electron when it strikes the anod2020Matter Waves
  18. 18A light beam of intensity is incident normally on a perfectly reflecting surface of sides . The momentum imparted to the surface by the ligh2020Matter Waves
  19. 19The following graph represents the variation of photocurrent with anode potential for a metal surface. Here and represents intensities and r2020Photoelectric Effect
  20. 20Angular momentum of an electron in hydrogen atom is is the Planck's constant). The KE of the electron is2020Matter Waves
  21. 21Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intens2019Photoelectric Effect
  22. 22The number of photons falling per second on a completely darkened plate to produce a force of \( 6.62 10^{-5} {~N} \) is ' \( n \) '. If the2018Matter Waves
  23. 23The maximum kinetic energy of emitted photoelectrons depends on2018Photoelectric Effect
  24. 24A proton and an \( \) particle are accelerated through the same potential difference \( V \). The ratio of their de-Broglie's wavelength is2018Matter Waves
  25. 25The value of acceleration due to gravity at adepth of \( 1600 {~km} \) is equal to: [Radius of earth \( =6400 {~km} \) ]2017Photoelectric Effect
  26. 26A linear object of height \( 10 {~cm} \) is kept in front of a concave mirror of radius of curvature \( 15 {~cm} \), at a distance of \( 10 2017Matter Waves
  27. 27The variation of photo-current with collector potential for different frequencies of incident radiation \( v_{1}, v_{2} \) and \( v_{3} \) i2016Photoelectric Effect
  28. 28The de Broglie wavelength of an electron accelerated to a potential of \( 400 {~V} \) is approximately2016Matter Waves
  29. 29Total energy of electron in an excited state of hydrogen atom is \( -3.4 {eV} \). The kinetic and potential energy of electron in this state2016Photoelectric Effect
  30. 30A nucleus at rest splits into two nuclear parts having radii in the ratio \( 1: 2 \). Their velocities are in the ratio2015Matter Waves
  31. 31The half life of a radioactive substance is \( 20 \) minutes. The time taken between \( 50 \% \) decay and \( 87.5 \% \) decay of the substa2015Photoelectric Effect
  32. 32A microscope is having objective of focal length \( 1 {~cm} \) and eyepiece of focal length \( 6 {~cm} \). If tube length is \( 30 {~cm} \) 2014Matter Waves
  33. 33A fringe width of a certain interference pattern is \( =0.002 {~cm} \). What is the distance of \( 5^{ {th }} \) dark fringe from center?2014Photoelectric Effect
  34. 34Light emitted during the de excitation of electron from to , when incident on a metal, photoelectrons are just emitted from that metal. In w2013Photoelectric Effect
  35. 35The additional energy that should be given to an electron to reduce its de-Broglie wavelength from to is2013Matter Waves
  36. 36Maximum velocity of the photoelectron emitted by a metal is . Take the value of specific charge of the electron is . Then the stopping poten2013Photoelectric Effect
  37. 37A proton and an alpha particle are accelerated under the same potential difference. The ratio of de-Broglie wavelengths of the proton and th2012Matter Waves
  38. 38n photons of wavelength are absorbed by a black body of mass . The momentum gained by the body is2012Photoelectric Effect
  39. 39The photoelectric threshold wavelength for silver is . The energy of the electron ejected from the surface of silver by an incident waveleng2011Photoelectric Effect
  40. 40An electron of mass and a proton of mass are moving with the same speed. The ratio of their de-Broglie's wavelengths is2011Matter Waves
  41. 41According to Einstein's photoelectric equation, the graph of of the photoelectron emitted from the metal versus the frequency of the inciden2010Photoelectric Effect
  42. 42The de-Broglie wavelength of the electron in the ground state of the hydrogen atom is ..... (radius of the first orbit of hydrogen atom ).2010Matter Waves
  43. 43The kinetic energy of an electron gets tripled, then the de-Broglie wavelength associated with it changes by a factor2009Matter Waves
  44. 44G P Thomson experimentally confirmed the existence of matter waves by the phenomena2009Matter Waves
  45. 45When a piece of metal is illuminated by a monochromatic light of wavelength , then stopping potential is . When same surface is illuminated 2008Photoelectric Effect
  46. 46The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend upon2008Photoelectric Effect
  47. 47If an electron and a proton have the same de-Broglie wavelength, then the kinetic energy of the electron is2008Matter Waves
  48. 48Which one of the following graph represents the variation of maximum kinetic energy of the emitted electrons with frequency in photoelectric2007Photoelectric Effect
  49. 49and are two metals with threshold frequencies and . Two identical photons of energy each are incident on them. Then photoelectrons are emitt2007Photoelectric Effect
  50. 50The electromagnetic theory of light failed to explain2007Photoelectric Effect

Frequently Asked Questions

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

This chapter includes 51 questions compiled from KCET papers spanning 2007 to 2026.

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

These are KCET 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 KCET Physics?

Dual Nature of Matter has appeared in 20 of the 20 years of KCET papers covered here, with 51 questions across 20 papers - about 3 per paper it appears in.

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

Of the 51 questions analysed for this chapter, 63% are easy, 29% moderate and 8% tough. 2021 had the most, with 4 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 - 29 questions (57%)
  • Matter Waves - 22 questions (43%)
  • Photoelectric Effect has produced the most tough questions (2).
6.Is Dual Nature of Matter's weightage in KCET going up or down?

Across all 20 papers analysed, Dual Nature of Matter has averaged about 2.5 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.