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Day 70: JEE Mains Physics

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

  1. Question 1

    Waves. This type asked 3 times: 28 Jun 2022, 27 Jan 2024, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    77
    In the resonance experiment, two air columns (closed at one end) of 100 cm and 120 cm long, give 15 beats per second when each one is sounding in the respective fundamental modes. The velocity of sound in the air column is :

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  2. Question 2

    Dual Nature of Radiation and Matter. This type asked 3 times: 2021 Paper 11, 26 Jun 2022, 2 Apr 2025. This one: 2 Apr 2025 See all 3 of this type

    20
    A monochromatic light is incident on a metallic plate having work function ϕ\phi. An electron, emitted normally to the plate from a point AA with maximum kinetic energy, enters a constant magnetic field, perpendicular to the initial velocity of electron. The electron passes through a curve and hits back the plate at a point B . The distance between A and B is : (Given : The magnitude of charge of an electron is e and mass is m,hm,h is Planck's constant and c is velocity of light. Take the magnetic field exists throughout the path of electron)

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  3. Question 3

    Magnetism and Matter. This type asked 3 times: 2021 Paper 12, 27 Jun 2022, 2 Apr 2025. This one: 2 Apr 2025 See all 3 of this type

    10
    The relationship between the magnetic susceptibility (χ)(\chi) and the magnetic permeability (μ)(\mu) is given by : ( μ0\mu_{0} is the permeability of free space and μr\mu_{r} is relative permeability)

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  4. Question 4

    Ray Optics. This type asked 3 times: 2021 Paper 20, 1 Feb 2023, 2 Apr 2025. This one: 2 Apr 2025 See all 3 of this type

    89
    Two identical objects are placed in front of convex mirror and concave mirror having same radii of curvature of 12 cm , at same distance of 18 cm from the respective mirrors. The ratio of sizes of the images formed by convex mirror and by concave mirror is :

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  5. Question 5

    System of Particles and Rotational Motion. This type asked 3 times: 13 Apr 2023, 9 Apr 2024, 2 Apr 2025. This one: 2 Apr 2025 See all 3 of this type

    96
    A wheel of radius 0.2 m rotates freely about its center when a string that is wrapped over its rim is pulled by force of 10 N as shown in figure. The established torque produces an angular acceleration of 2rad/s22rad/s^{2}. Moment of inertia of the wheel is ____\_\_\_\_ kgm2kgm^{2}. (Acceleration due to gravity =10 m/s2= 10\text{ }m/s^{2} )