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Day 317: JEE Mains Physics

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

  1. Question 1

    Atoms. Asked once: 2021 Paper 26 (same type asked 3 times) See all 3 of this type

    13
    The recoil speed of a hydrogen atom after it emits a photon in going from n=5n = 5 state to n=1n = 1 state will be:

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  2. Question 2

    Units and Measurements. Asked once: 30 Jan 2023 (same type asked 3 times) See all 3 of this type

    30
    In an experiment for estimating the value of focal length of converging mirror, image of an object placed at 40 cm40\text{ }cm from the pole of the mirror is formed at distance 120 cm120\text{ }cm from the pole of the mirror. These distances are measured with a modified scale in which there are 20 small divisions in 1 cm1\text{ }cm. The value of error in measurement of focal length of the mirror is 1 K cm\frac{1}{\text{ }K}\text{ }cm. The value of KK is

  3. Question 3

    Work, Energy and Power. Asked once: 31 Jan 2023 (same type asked 3 times) See all 3 of this type

    116
    A ball is dropped from a height of 20 m20\text{ }m. If the coefficient of restitution for the collision between ball and floor is 0.5 , after hitting the floor, the ball rebounds to a height of___ mm

  4. Question 4

    Alternating Current. Asked once: 25 Jul 2022 (same type asked 3 times) See all 3 of this type

    12
    To increase the resonant frequency in series LCR circuit,

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  5. Question 5

    Laws of Motion. Asked once: 28 Jun 2022 (same type asked 3 times) See all 3 of this type

    27
    A hanging mass MM is connected to a four times bigger mass by using a string-pulley arrangement, as shown in the figure. The bigger mass is placed on a horizontal ice-slab and being pulled by 2Mg2Mg force. In this situation, tension in the string is x5\frac{x}{5} MgMg for x=____x = \_\_\_\_. Neglect mass of the string and friction of the block (bigger mass) with ice slab. (Given g=g = acceleration due to gravity)