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Day 204: JEE Mains Physics

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

  1. Question 1

    Waves. Asked once: 27 Jan 2024 (same type asked 3 times) See all 3 of this type

    113
    A closed organ pipe 150 cm150\text{ }cm long gives 7 beats per second with an open organ pipe of length 350 cm, both vibrating in fundamental mode. The velocity of sound is ______ m/sm/s.

  2. Question 2

    Dual Nature of Radiation and Matter. Asked once: 26 Jun 2022 (same type asked 3 times) See all 3 of this type

    107
    A metal surface is illuminated by a radiation of wavelength 4500Å4500\text{Å}. The ejected photo-electron enters a constant magnetic field of 2mT2mT making an angle of 90∘90^{\circ} with the magnetic field. If it starts revolving in a circular path of radius 2 mm2\text{ }mm, the work function of the metal is approximately:

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  3. Question 3

    Magnetism and Matter. Asked once: 27 Jun 2022 (same type asked 3 times) See all 3 of this type

    10
    The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A−mWb/A - m is : [Permeability of free space μ0=4π×10−7 Wb/A−m\mu_{0}= 4\pi \times10^{- 7}\text{ }Wb/A - m ]

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  4. Question 4

    Ray Optics. Asked once: 1 Feb 2023 (same type asked 3 times) See all 3 of this type

    96
    Two objects A and B are placed at 15 cm15\text{ }cm and 25 cm25\text{ }cm from the pole in front of a concave mirror having radius of curvature 40 cm40\text{ }cm. The distance between images formed by the mirror is

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 2 Apr 2025 (same type asked 3 times) See all 3 of this type

    3
    A cord of negligible mass is wound around the rim of a wheel supported by spokes with negligible mass. The mass of wheel is 10 kg and radius is 10 cm and it can freely rotate without any friction. Initially the wheel is at rest. If a steady pull of 20 N is applied on the cord, the angular velocity of the wheel, after the cord is unwound by 1 m , would be :

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