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Day 146: JEE Mains Physics

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

  1. Question 1

    Ray Optics. Asked once: 3 Apr 2025 (same type asked 8 times) See all 8 of this type

    96
    Light from a point source in air falls on a spherical glass surface (refractive index, μ=1.5\mu = 1.5 and radius of curvature =50 cm= 50\text{ }cm ). The image is formed at a distance of 200 cm from the glass surface inside the glass. The magnitude of distance of the light source from the glass surface is ____\_\_\_\_ m.

  2. Question 2

    Units and Measurements. Asked once: 28 Jan 2026 S1 (same type asked 8 times) See all 8 of this type

    17
    When both jaws of Vernier calipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4th 4^{\text{th~}} mark on Vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and 5th5^{\text{th}} division of Vernier scale coincides with a main scale division. Measured length of cylinder is ____\_\_\_\_ mm. (Least count of Vernier caliper =0.1 mm= 0.1\text{ }mm )

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  3. Question 3

    Dual Nature of Radiation and Matter. Asked once: 12 Apr 2023 (same type asked 8 times) See all 8 of this type

    6
    A proton and an α\alpha-particle are accelerated from rest by 2 V2\text{ }V and 4 V4\text{ }V potentials, respectively. The ratio of their de-Broglie wavelength is:

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  4. Question 4

    Gravitation. Asked once: 4 Apr 2024 (same type asked 8 times) See all 8 of this type

    110
    A 90 kg90\text{ }kg body placed at 2R2R distance from surface of earth experiences gravitational pull of: ( R=R = Radius of earth, g=10 ms−2g = 10{\text{ }ms}^{- 2} )

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  5. Question 5

    Units and Measurements. Asked once: 23 Jan 2026 S1 (same type asked 8 times) See all 8 of this type

    19
    In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is ____\_\_\_\_ mm. [Assume least count is 0.01 mm ]

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