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Day 198: JEE Mains Physics

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

  1. Question 1

    System of Particles and Rotational Motion. Asked once: 7 Apr 2025 (same type asked 3 times) See all 3 of this type

    100
    MM and RR be the mass and radius of a disc. A small disc of radius R/3 is removed from the bigger disc as shown in figure. The moment of inertia of remaining part of bigger disc about an axis AB passing through the center O and perpendicular to the plane of disc is 4xMR2\frac{4}{x}{MR}^{2}. The value of x is.

  2. Question 2

    Dual Nature of Radiation and Matter. Asked once: 10 Apr 2023 (same type asked 3 times) See all 3 of this type

    18
    The de Broglie wavelength of a molecule in a gas at room temperature (300 K)(300\text{ }K) is λ1\lambda_{1}. If the temperature of the gas is increased to 600 K600\text{ }K, then the de Broglie wavelength of the same gas molecule becomes

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  3. Question 3

    Work, Energy and Power. Asked once: 29 Jan 2025 (same type asked 3 times) See all 3 of this type

    10
    As shown below, bob A of a pendulum having massless string of length ' R ' is released from 60∘60^{\circ} to the vertical. It hits another bob B of half the mass that is at rest on a friction less table in the centre. Assuming elastic collision, the magnitude of the velocity of bob A after the collision will be (take gg as acceleration due to gravity)

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  4. Question 4

    Work, Energy and Power. Asked once: 10 Apr 2023 (same type asked 3 times) See all 3 of this type

    7
    A particle of mass mm moving with velocity vv collides with a stationary particle of mass 2 m2\text{ }m. After collision, they stick together and continue to move together with velocity

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  5. Question 5

    Atoms. Asked once: 5 Apr 2024 (same type asked 3 times) See all 3 of this type

    112
    The shortest wavelength of the spectral lines in the Lyman series of hydrogen spectrum is 915Å915\text{Å}. The longest wavelength of spectral lines in the Balmer series will be ______ Å\text{Å}.