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Day 469: JEE Mains Physics

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

  1. Question 1

    Work, Energy and Power. Asked once: 3 Apr 2025

    16
    A particle is released from height S above the surface of the earth. At certain height its kinetic energy is three times its potential energy. The height from the surface of the earth and the speed of the particle at that instant are respectively.

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  2. Question 2

    Alternating Current. Asked once: 5 Apr 2024

    100
    A series LCR circuit is subjected to an AC signal of 200 V,50 Hz200\text{ }V,50\text{ }Hz. If the voltage across the inductor (L=10mH)(L = 10mH) is 31.4 V31.4\text{ }V, then the current in this circuit is ::

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  3. Question 3

    Atoms. Asked once: 24 Jan 2025

    5
    During the transition of electron from state A to state C of a Bohr atom, the wavelength of emitted radiation is 2000Å2000\text{Å} and it becomes 6000Å6000\text{Å} when the electron jumps from state BB to state CC. Then the wavelength of the radiation emitted during the transition of electrons from state A to state B is :-

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  4. Question 4

    Current Electricity. Asked once: 28 Jan 2026 S2

    6
    A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances (R1=R2=R3=R4)\left( R_{1} = R_{2} = R_{3} = R_{4} \right). When R3R_{3} resistance is heated to some temperature, its resistance value has gone up by 10%10\%. The potential difference (VA−VB)\left( V_{A} - V_{B} \right) (after R3R_{3} is heated) is ____\_\_\_\_ V.

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  5. Question 5

    Dual Nature of Radiation and Matter. Asked once: 22 Jan 2025

    7
    An electron in the ground state of the hydrogen atom has the orbital radius of 5.3×10−11 m5.3 \times10^{- 11}\text{ }m while that for the electron in third excited state is 8.48×10−10 m8.48 \times10^{- 10}\text{ }m. The ratio of the de Broglie wavelengths of electron in the excited state to that in the ground state is

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