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Day 329: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 25 Jan 2023 (same type asked 9 times) See all 9 of this type

    109
    The resistance of a wire is 5Ω5\Omega. It's new resistance in ohm if stretched to 5 times of it's original length will be:

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  2. Question 2

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 15 (same type asked 8 times) See all 8 of this type

    14
    For a certain incident wavelength on a metal surface, the max KE of the photoelectron is 4.8eV4.8eV. If the incident wavelength is doubled, then the max KEKE changes to 1.6eV1.6eV. Then find the threshold wavelength for the metal surface.

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  3. Question 3

    Wave Optics. Asked once: 9 Apr 2024 (same type asked 8 times) See all 8 of this type

    24
    In a Young's double slit experiment, the intensity at a point is (14)th \left( \frac{1}{4} \right)^{\text{th~}} of the maximum intensity, the minimum distance of the point from the central maximum is______ μm\mu m. (Given: λ=600 nm, d=1.0 mm,D=1.0 m\lambda= 600\text{ }nm,\text{ }d = 1.0\text{ }mm,D = 1.0\text{ }m )

  4. Question 4

    Ray Optics. Asked once: 29 Jan 2025 (same type asked 8 times) See all 8 of this type

    84
    Two concave refracting surfaces of equal radii of curvature and refractive index 1.5 face each other in air as shown in figure. A point object O is placed midway, between P and B. The separation between the images of O , formed by each refracting surface is :

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  5. Question 5

    Units and Measurements. Asked once: 27 Jul 2022 (same type asked 8 times) See all 8 of this type

    22
    The one division of main scale of vernier callipers reads 1 mm1\text{ }mm and 10 divisions of Vernier scale is equal to the 9 divisions on main scale. When the two jaws of the instrument touch each other the zero of the Vernier lies to the right of zero of the main scale and its fourth division coincides with a main scale division. When a spherical bob is tightly placed between the two jaws, the zero of the Vernier scale lies in between 4.1 cm4.1\text{ }cm and 4.2 cm4.2\text{ }cm and 6th 6^{\text{th~}} Vernier division coincides with a main scale division. The diameter of the bob will be ____×10−2 cm\_\_\_\_\times10^{- 2}\text{ }cm.