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Day 18: JEE Mains Physics

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

  1. Question 1

    Dual Nature of Radiation and Matter. This type asked 6 times: 2021 Paper 4, 2021 Paper 18, 2021 Paper 21, 28 Jun 2022, 29 Jul 2022, 22 Jan 2025. This one: 22 Jan 2025 See all 6 of this type

    85
    A light source of wavelength λ\lambda illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface is illuminated by a light source of wavelength λ2\frac{\lambda}{2}, then the maximum kinetic energy of ejected electrons will be (The work function of metal is 1 eV )

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  2. Question 2

    Mechanical Properties of Fluids. This type asked 6 times: 27 Jun 2022, 29 Jul 2022, 24 Jan 2023, 6 Apr 2023, 6 Apr 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 6 of this type

    77
    A small rigid spherical ball of mass MM is dropped in a long vertical tube containing glycerine. The velocity of the ball becomes constant after some time. If the density of glycerine is half of the density of the ball, then the viscous force acting on the ball will be (consider g as acceleration due to gravity)

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  3. Question 3

    Dual Nature of Radiation and Matter. This type asked 6 times: 2021 Paper 2, 2021 Paper 22, 1 Feb 2023, 8 Apr 2023, 1 Feb 2024, 8 Apr 2024. This one: 8 Apr 2024 See all 6 of this type

    3
    A proton and an electron are associated with same de-Broglie wavelength. The ratio of their kinetic energies is: (Assume h=6.63×10−34 J s, me=9.0×10−31 kgh = 6.63 \times10^{- 34}\text{ }J\text{ }s,{\text{ }m}_{e}= 9.0 \times10^{- 31}\text{ }kg and mp=1836m_{p}= 1836 times mem_{e} )

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  4. Question 4

    Oscillations. This type asked 6 times: 25 Jul 2022, 28 Jul 2022, 25 Jan 2023, 30 Jan 2024, 1 Feb 2024, 5 Apr 2024. This one: 5 Apr 2024 See all 6 of this type

    15
    A simple pendulum doing small oscillations at a place RR height above earth surface has time period of T1=4 sT_{1}= 4\text{ }s. T2T_{2} would be it's time period if it is brought to a point which is at a height 2R2R from earth surface. Choose the correct relation [R=\lbrack R = radius of Earth]:

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  5. Question 5

    Thermodynamics. This type asked 6 times: 2021 Paper 15, 2021 Paper 22, 14 Jun 2022, 28 Jul 2022, 25 Jan 2023, 1 Feb 2023. This one: 1 Feb 2023 See all 6 of this type

    98
    A Carnot engine operating between two reservoirs has efficiency 13\frac{1}{3}. When the temperature of cold reservoir raised by xx, its efficiency decreases to 16\frac{1}{6}. The value of xx, if the temperature of hot reservoir is 99∘C99^{\circ}C, will be:

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