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Day 191: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked once: 26 Jun 2022 (same type asked 4 times) See all 4 of this type

    108
    A radioactive nucleus can decay by two different processes. Half-life for the first process is 3.0 hours while it is 4.5 hours for the second process. The effective half- life of the nucleus will be:

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  2. Question 2

    Work, Energy and Power. Asked once: 27 Jun 2022 (same type asked 4 times) See all 4 of this type

    8
    What percentage of kinetic energy of a moving particle is transferred to a stationary particle when it strikes the stationary particle of 5 times its mass? (Assume the collision to be head-on elastic collision)

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  3. Question 3

    Current Electricity. Asked once: 14 Jun 2022 (same type asked 4 times) See all 4 of this type

    113
    A potentiometer wire of length 10 m10\text{ }m and resistance 20Ω20\Omega is connected in series with a 25 V25\text{ }V battery and an external resistance 30Ω30\Omega. A cell of emf EE in secondary circuit is balanced by 250 cm250\text{ }cm long potentiometer wire. The value of EE (in volt) is x10\frac{x}{10}. The value of xx is

  4. Question 4

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 9 (same type asked 4 times) See all 4 of this type

    13
    A particle is travelling 4 times as fast as an electron. Assuming the ratio of de-Broglie wavelength of a particle to that of electron is 2:12:1, the mass of the particle is:-

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  5. Question 5

    Waves. Asked once: 28 Jun 2022 (same type asked 4 times) See all 4 of this type

    117
    A tuning fork of frequency 340 Hz340\text{ }Hz resonates in the fundamental mode with an air column of length 125 cm125\text{ }cm in a cylindrical tube closed at one end. When water is slowly poured in it, the minimum height of water required for observing resonance once again is ____\_\_\_\_ cm. (Velocity of sound in air is 340 ms−1340{\text{ }ms}^{- 1} )