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Day 25: JEE Mains Physics

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

  1. Question 1

    Mechanical Properties of Fluids. This type asked 5 times: 2021 Paper 18, 30 Jan 2023, 7 Apr 2025, 21 Jan 2026 S2, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 5 of this type

    9
    When a part of a straight capillary tube is placed vertically in a liquid, the liquid raises upto certain height h . If the inner radius of the capillary tube, density of the liquid and surface tension of the liquid decrease by 1%1\% each, then the height of the liquid in the tube will change by ____\_\_\_\_ %.

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  2. Question 2

    Wave Optics. This type asked 5 times: 25 Jun 2022, 27 Jun 2022, 6 Apr 2023, 3 Apr 2025, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 5 of this type

    12
    The wavelength of light, while it is passing through water is 540 nm. The refractive index of water is 43\frac{4}{3}. The wavelength of the same light when it is passing through a transparent medium having refractive index of 32\frac{3}{2} is ____\_\_\_\_ nm.

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  3. Question 3

    System of Particles and Rotational Motion. This type asked 5 times: 28 Jun 2022, 25 Jan 2023, 1 Feb 2023, 2 Apr 2025, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 5 of this type

    1
    A solid sphere of mass 5 kg and radius 10 cm is kept in contact with another solid sphere of mass 10 kg and radius 20 cm . The moment of inertia of this pair of spheres about the tangent passing through the point of contact is ____\_\_\_\_ kg.m2kg.m^{2}.

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  4. Question 4

    Thermal Properties of Matter. This type asked 5 times: 2021 Paper 25, 27 Jul 2022, 13 Apr 2023, 7 Apr 2025, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 5 of this type

    13
    Rods x and y of equal dimensions but of different materials are joined as shown in figure. Temperatures of end points AA and FF are maintained at 100∘C100^{\circ}C and 40∘C40^{\circ}C respectively. Given the thermal conductivity of rod x is three times of that of rod y , the temperature at junction points BB and EE are (close to) :

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  5. Question 5

    Electrostatics. This type asked 5 times: 28 Jul 2022, 13 Apr 2023, 27 Jan 2024, 4 Apr 2025, 7 Apr 2025. This one: 7 Apr 2025 See all 5 of this type

    85
    A dipole with two electric charges of 2μC2\mu C magnitude each, with separation distance 0.5μ m0.5\mu\text{ }m, is placed between the plates of a capacitor such that its axis is parallel to an electric field established between the plates when a potential difference of 5 V is applied. Separation between the plates is 0.5 mm . If the dipole is rotated by 30∘30^{\circ} from the axis, it tends to realign in the direction due to a torque. The value of torque is:

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