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Day 146: MHT-CET Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Semiconductor Devices. Asked 2 times: 22 Apr 2025 S1, 13 Apr 2026 S2 See all 2 times it was asked

    148
    A pure silicon crystal at temperature 300300 K has electron and hole concentration (ni)(n_i) 101610^{16} per m3\mathrm{m^3} each and 102110^{21} phosphorus atoms (ne)(n_e) are added per cubic metre. The new hole concentration in silicon crystal is

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  2. Question 2

    Structure of Atoms and Nuclei. Asked 2 times: 4 May 2023 S1, 13 Apr 2026 S2 See all 2 times it was asked

    147
    For hydrogen atom, λ1\lambda_1 and λ2\lambda_2 are the wavelengths corresponding to the transitions 11 and 22 respectively as shown in figure. The ratio of λ1\lambda_1 and λ2\lambda_2 is x/32x/32. The value of xx is

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  3. Question 3

    Electromagnetic Induction. Asked 2 times: 20 Apr 2025 S1, 13 Apr 2026 S1 See all 2 times it was asked

    134
    The current flowing through the inductor of self inductance 'L' is continuously increasing at constant rate. The variation of induced e.m.f. (e) versus dIdt\dfrac{dI}{dt} is shown graphically by figure

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  4. Question 4

    Electrostatics. Asked 2 times: 22 Apr 2025 S2, 13 Apr 2026 S1 See all 2 times it was asked

    125
    A charge 'Q' C is placed at the centre of a cube. The electric flux through two opposite faces of the cube is (ϵ0\epsilon_0 = permittivity of free space)

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  5. Question 5

    Magnetic Fields Due to Electric Current. Asked 2 times: 11 May 2023 S1*, 13 Apr 2026 S1 (* = numbers or wording changed that year) See all 2 times it was asked

    132
    The magnetic flux near the axis and inside the air core solenoid of length 60 cm carrying current I is π2×10−6\dfrac{\pi}{2} \times 10^{-6} Wb. Its magnetic moment will be (cross-sectional area is very small as compared to length of solenoid, μ0\mu_0 = Permeability of free space = 4π×10−74\pi \times 10^{-7} SI unit)

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