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Day 423: JEE Mains Physics

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

  1. Question 1

    Gravitation. Asked once: 14 Jun 2022 (same type asked 14 times) See all 14 of this type

    92
    The distance between Sun and Earth is R. The duration of year if the distance between Sun and Earth becomes 3R3R will be:

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  2. Question 2

    Electrostatics. Asked once: 30 Jan 2023 (same type asked 12 times) See all 12 of this type

    29
    A capacitor of capacitance 900μF900\mu F is charged by a 100 V100\text{ }V battery. The capacitor is disconnected from the battery and connected to another uncharged identical capacitor such that one plate of uncharged capacitor connected to positive plate and another plate of uncharged capacitor connected to negative plate of the charged capacitor. The loss of energy in this process is measured as x×10−2 Jx \times10^{- 2}\text{ }J. The value of xx is

  3. Question 3

    Electromagnetic Waves. Asked once: 14 Jun 2022 (same type asked 11 times) See all 11 of this type

    13
    A plane electromagnetic wave travels in a medium of relative permeability 1.61 and relative permittivity 6.44. If magnitude of magnetic intensity is 4.5×10−2Am−14.5 \times10^{- 2}Am^{- 1} at a point, what will be the approximate magnitude of electric field intensity at that point? (Given : permeability of free space μ0=4π×10−7\mu_{0}= 4\pi \times10^{- 7} NA−2NA^{- 2}, speed of light in vacuum c=3×108 ms−1c = 3 \times10^{8}{\text{ }ms}^{- 1} )

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  4. Question 4

    Units and Measurements. Asked once: 25 Jun 2022 (same type asked 10 times) See all 10 of this type

    111
    For z=a2x3y12z=a^{2}x^{3}y^{\frac{1}{2}}, where aa is a constant. If percentage error in measurement of ' xx ' and ' yy ' are 4%4\% and 12%12\%, respectively, then the percentage error for ' zz ' will be ____ %\_\_\_\_\ \%.

  5. Question 5

    Alternating Current. Asked once: 2021 Paper 18 (same type asked 10 times) See all 10 of this type

    8
    A series LCR circuit driven by 300 V300\text{ }V at a frequency of 50 Hz50\text{ }Hz contains a resistance R=3kΩR = 3k\Omega, an inductor of inductive reactance XL=250πΩX_{L}= 250\pi\Omega and an unknown capacitor. The value of capacitance to maximize the average power should be : (Take π2=10\pi^{2}= 10)

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