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Dual Nature of Radiation and Matter

MHT-CET Physics. Try each one first, then open its answer.

Top 10 MHT-CET PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 14 times: 3 May 2023 S1, 3 May 2023 S2, 11 May 2024 S1, 19 Apr 2025 S1, 21 Apr 2025 S2, 25 Apr 2025 S2, 11 Apr 2026 S2, 15 Apr 2026 S1, 16 Apr 2026 S2, 18 Apr 2026 S2, 13 May 2026 S1, 14 May 2026 S2, 15 May 2026 S1, 19 May 2026 S2. This one: 19 May 2026 S2 See all 14 of this type

    145
    Radiation of wavelength λ\lambda, is incident on a photocell. The fastest emitted electron has speed vv. If the wavelength is changed to 3λ4\dfrac{3\lambda}{4}, the speed of the fastest electron will be

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  2. Question 2

    This type asked 14 times: May 2022 S1, 4 May 2023 S2, 10 May 2023 S1, 11 May 2023 S1, 15 May 2023 S1, 10 May 2024 S1, 10 May 2024 S2, 12 May 2024 S2, 14 May 2024 S1, 19 Apr 2025 S2, 23 Apr 2025 S1, 13 Apr 2026 S2, 17 Apr 2026 S1, 18 Apr 2026 S1. This one: 18 Apr 2026 S1 See all 14 of this type

    144
    If the kinetic energy of a particle is increased to 16 times, the percentage change in the de Broglie wavelength of a particle is

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  3. Question 3

    Asked 12 times: 2 May 2023 S1*, 15 May 2023 S2*, 9 May 2024 S2*, 11 May 2024 S2*, 12 May 2024 S1*, 13 May 2024 S2*, 14 May 2024 S2*, 22 Apr 2025 S1*, 15 Apr 2026 S2*, 19 Apr 2026 S2*, 15 May 2026 S2*, 19 May 2026 S2 (* = numbers or wording changed that year) See all 12 times it was asked

    144
    When a metallic surface is illuminated with radiation of wavelength λ\lambda, the stopping potential is VV. If the surface is now illuminated with a radiation of wavelength 4λ4\lambda, the stopping potential (V8)\left(\dfrac{V}{8}\right). The threshold wavelength for the surface is

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  4. Question 4

    This type asked 12 times: 2 May 2023 S2, 10 May 2023 S1, 11 May 2023 S1, 16 May 2023 S2, 10 May 2024 S2, 19 Apr 2025 S1, 22 Apr 2025 S1, 26 Apr 2025 S1, 13 Apr 2026 S1, 15 Apr 2026 S2, 17 Apr 2026 S2, 13 May 2026 S2. This one: 13 May 2026 S2 See all 12 of this type

    145
    A point source of light is used in a photoelectric effect. If the source is moved farther from the emitting metal, then the stopping potential

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  5. Question 5

    This type asked 11 times: 4 May 2023 S1, 4 May 2023 S2, 15 May 2023 S1, 9 May 2024 S2, 12 May 2024 S1, 21 Apr 2025 S2, 22 Apr 2025 S2, 13 Apr 2026 S1, 13 Apr 2026 S2, 18 Apr 2026 S1, 14 May 2026 S2. This one: 14 May 2026 S2 See all 11 of this type

    145
    Energy of the incident photon on the metal surface is 3W3W and then 5W5W, where WW is the work function of that metal. The ratio of velocities of emitted photoelectrons is

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  6. Question 6

    This type asked 10 times: 10 May 2023 S2, 11 May 2023 S2, 9 May 2024 S1, 10 May 2024 S1, 20 Apr 2025 S2, 21 Apr 2025 S1, 25 Apr 2025 S1, 11 Apr 2026 S1, 17 Apr 2026 S1, 19 Apr 2026 S1. This one: 19 Apr 2026 S1 See all 10 of this type

    144
    A photoelectric surface is illuminated successively by monochromatic light of wavelength λ\lambda and (λ/3)(\lambda/3). If the maximum kinetic energy of the emitted photo electrons in the second case is 44 times that in the first case, the work function of the surface of the material is (hh = Planck's constant, cc = speed of light)

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  7. Question 7

    This type asked 8 times: 3 May 2023 S2, 9 May 2023 S2, 11 May 2023 S2, 15 May 2023 S2, 23 Apr 2025 S1, 16 Apr 2026 S1, 19 Apr 2026 S1, 19 May 2026 S1. This one: 19 May 2026 S1 See all 8 of this type

    144
    In an experiment on photoelectric effect, the stopping potential V0V_0 is plotted against the frequency ν\nu of the incident light. Considering ee as the electronic charge, the work function of the photoelectric surface is given by

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  8. Question 8

    This type asked 8 times: May 2021 S1, 3 May 2023 S1, 16 May 2023 S2, 26 Apr 2025 S1, 26 Apr 2025 S2, 11 Apr 2026 S1, 11 Apr 2026 S2, 13 May 2026 S2. This one: 13 May 2026 S2 See all 8 of this type

    144
    The energy of a photon is equal to the kinetic energy of a proton. If λ1\lambda_1 is the de-Broglie wavelength of a proton, λ2\lambda_2 is the wavelength associated with the photon and if the energy of the photon is EE then (λ1/λ2)(\lambda_1/\lambda_2) is proportional to

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  9. Question 9

    This type asked 7 times: 16 May 2023 S1, 9 May 2024 S1, 14 May 2024 S1, 22 Apr 2025 S2, 18 Apr 2026 S2, 19 Apr 2026 S2, 19 May 2026 S1. This one: 19 May 2026 S1 See all 7 of this type

    146
    The de Broglie wavelength of an electron moving in the nthn^{th} Bohr orbit of radius 'rr' is

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  10. Question 10

    Asked 6 times: 10 May 2023 S1*, 11 May 2023 S1*, 15 May 2023 S1*, 10 May 2024 S2*, 12 May 2024 S2*, 19 Apr 2025 S2 (* = numbers or wording changed that year) See all 6 times it was asked

    24
    An electron accelerated by a potential difference ' VV ' has de-Broglie wavelength ' λ\lambda '. If the electron is accelerated by a potential difference ' 9 V ', its de-Broglie wavelength will be

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