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Day 210: JEE Mains Physics

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

  1. Question 1

    Alternating Current. Asked once: 2021 Paper 13 (same type asked 3 times) See all 3 of this type

    2
    If an AC source is connected to a capacitor in series. Then which of the graphs relating current and emf is correct?

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  2. Question 2

    Atoms. Asked once: 29 Jan 2024 (same type asked 3 times) See all 3 of this type

    21
    When a hydrogen atom going from n=2n= 2 to n=1n= 1 emits a photon, its recoil speed is X5 m/s\frac{X}{5}\text{ }m/s. Where x=x = ______ . (Use: mass of hydrogen atom =1.6×10−27 kg= 1.6 \times10^{- 27}\text{ }kg )

  3. Question 3

    Units and Measurements. Asked once: 6 Apr 2023 (same type asked 3 times) See all 3 of this type

    91
    A 2-meter-long scale with least count of 0.2 cm0.2\text{ }cm is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at 80 cm80\text{ }cm mark and 1 m1\text{ }m mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at 180 cm180\text{ }cm mark. The % error in the estimation of focal length is:

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  4. Question 4

    Work, Energy and Power. Asked once: 6 Apr 2023 (same type asked 3 times) See all 3 of this type

    118
    A body is dropped on ground from a height ' h1h_{1} ' and after hitting the ground, it rebounds to a height ' h2h_{2} ' If the ratio of velocities of the body just before and after hitting ground is 4 , then percentage loss in kinetic energy of the body is x4\frac{x}{4}. The value of xx is___

  5. Question 5

    Alternating Current. Asked once: 25 Jan 2023 (same type asked 3 times) See all 3 of this type

    8
    In an LC oscillator, if values of inductance and capacitance become twice and eight times, respectively, then the resonant frequency of oscillator becomes xx times its initial resonant frequency ω0\omega_{0}. The value of xx is:

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