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Day 178: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 23 Jan 2026 S1 (same type asked 4 times) See all 4 of this type

    25
    The space between the plates of a parallel-plate capacitor of capacitance C (without any dielectric) is now filled with three dielectric slabs of dielectric constants K1=2, K2=3K_{1} = 2,{\text{ }K}_{2} = 3, and K3=5K_{3} = 5 (as shown in the figure). If new capacitance is n3C\frac{n}{3}C then the value of nn is ____\_\_\_\_ .

  2. Question 2

    Motion in a Plane. Asked once: 29 Jan 2025 (same type asked 4 times) See all 4 of this type

    16
    A body of mass ' m ' connected to a massless and unstretchable string goes in a vertical circle of radius ' R ' under gravity g . The other end of the string is fixed at the center of circle. If velocity at top of circular path is ngRn\sqrt{gR}, where, n≥1n \geq 1, then ratio of kinetic energy of the body at bottom to that at top of the circle is

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  3. Question 3

    Electromagnetic Waves. Asked once: 8 Apr 2023 (same type asked 4 times) See all 4 of this type

    104
    The waves emitted when a metal target is bombarded with high energy electrons are

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  4. Question 4

    Wave Optics. Asked once: 23 Jan 2026 S2 (same type asked 4 times) See all 4 of this type

    19
    When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is ____\_\_\_\_ . (tan⁡−1(1.52)=57.7∘\left( \tan^{- 1}(1.52) =57.7^{\circ} \right., refractive indices of air and glass are 1.00 and 1.52 , respectively)

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  5. Question 5

    Mechanical Properties of Fluids. Asked once: 3 Apr 2025 (same type asked 4 times) See all 4 of this type

    87
    A solid steel ball of diameter 3.6 mm acquired terminal velocity 2.45×10−2 m/s2.45 \times10^{- 2}\text{ }m/s while falling under gravity through an oil of density 925 kg m−3925\text{ }kg{\text{ }m}^{- 3}. Take density of steel as 7825 kg m−37825\text{ }kg{\text{ }m}^{- 3} and g as 9.8 m/s2m/s^{2}. The viscosity of the oil in SI unit is.

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