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Day 374: JEE Mains Physics

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

  1. Question 1

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 12 (same type asked 8 times) See all 8 of this type

    4
    When a metal is illuminated by light of wavelength λ\lambda, the stopping potential is V0V_{0} and for wavelength 2λ2\lambda, it is 3V03V_{0}. Then the threshold wavelength is?

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  2. Question 2

    Wave Optics. Asked once: 1 Feb 2024 (same type asked 8 times) See all 8 of this type

    118
    In Young's double slit experiment, monochromatic light of wavelength 5000Å5000\text{Å} is used. The slits are 1.0 mm1.0\text{ }mm apart and screen is placed at 1.0 m1.0\text{ }m away from slits. The distance from the centre of the screen where intensity becomes half of the maximum intensity for the first time is ______ ×10−6 m\times10^{- 6}\text{ }m.

  3. Question 3

    Ray Optics. Asked once: 28 Jan 2025 (same type asked 8 times) See all 8 of this type

    81
    In a long glass tube, mixture of two liquids A and B with refractive indices 1.3 and 1.4 respectively, forms a convex refractive meniscus towards A . If an object placed at 13 cm from the vertex of the meniscus in A forms an image with a magnification of ' -2 ' then the radius of curvature of meniscus is :

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  4. Question 4

    Units and Measurements. Asked once: 26 Jul 2022 (same type asked 8 times) See all 8 of this type

    92
    In a Vernier Calipers. 10 divisions of Vernier scale is equal to the 9 divisions of main scale. When both jaws of Vernier calipers touch each other, the zero of the Vernier scale is shifted to the left of zero of the main scale and 4th 4^{\text{th~}} Vernier scale division exactly coincides with the main scale reading. One main scale division is equal to 1 mm1\text{ }mm. While measuring diameter of a spherical body, the body is held between two jaws. It is now observed that zero of the Vernier scale lies between 30 and 31 divisions of main scale reading and 6th 6^{\text{th~}} Vernier scale division exactly. coincides with the main scale reading. The diameter of the spherical body will be:

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  5. Question 5

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 14 (same type asked 8 times) See all 8 of this type

    1
    An electron, a proton and an α\alpha-particle are accelerated from rest through the same potential difference. Arrange their de Broglie wavelengths in decreasing order.

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