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Day 52: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. This type asked 4 times: 2021 Paper 20, 26 Jul 2022, 29 Jul 2022, 30 Jan 2023. This one: 30 Jan 2023 See all 4 of this type

    1
    The magnetic moments associated with two closely wound circular coils AA and BB of radius rA=10 cmr_{A}= 10\text{ }cm and rB=20 cmr_{B}= 20\text{ }cm respectively are equal if : (Where NA,IAN_{A},I_{A} and NB,IBN_{B},I_{B} are number of turn and current of AA and BB respectively)

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  2. Question 2

    Nuclei. This type asked 4 times: 2021 Paper 9, 2021 Paper 11, 26 Jun 2022, 30 Jan 2023. This one: 30 Jan 2023 See all 4 of this type

    114
    A radioactive nucleus decays by two different process. The half-life of the first process is 5 minutes and that of the second process is 30 s30\text{ }s. The effective half-life of the nucleus is calculated to be α11 s\frac{\alpha}{11}\text{ }s. The value of α\alpha is______

  3. Question 3

    Work, Energy and Power. This type asked 4 times: 2021 Paper 10, 2021 Paper 25, 27 Jun 2022, 25 Jan 2023. This one: 25 Jan 2023 See all 4 of this type

    115
    A body of mass 1 kg1\text{ }kg collides head on elastically with a stationary body of mass 3 kg3\text{ }kg. After collision, the smaller body reverses its direction of motion and moves with a speed of 2 ms\frac{2\text{ }m}{s}. The initial speed of the smaller body before collision is ____\_\_\_\_ ms−1ms^{- 1}.

  4. Question 4

    Current Electricity. This type asked 4 times: 2021 Paper 14, 14 Jun 2022, 26 Jul 2022, 28 Jul 2022. This one: 28 Jul 2022 See all 4 of this type

    25
    As shown in the figure, a potentiometer wire of resistance 20Ω20\Omega and length 300 cm300\text{ }cm is connected with resistance box (R.B.) and a standard cell of emf 4 V4\text{ }V. For a resistance ' RR ' of resistance box introduced into the circuit, the null point for a cell of 20mV20mV is found to be 60 cm60\text{ }cm. The value of ' RR ' is ____\_\_\_\_ Ω\Omega.

  5. Question 5

    Dual Nature of Radiation and Matter. This type asked 4 times: 2021 Paper 4, 2021 Paper 9, 2021 Paper 14, 26 Jul 2022. This one: 26 Jul 2022 See all 4 of this type

    100
    A nucleus of mass MM at rest splits into two parts having masses M′3\frac{M^{'}}{3} and 2M′3(M′<M)\frac{2M^{'}}{3}\left( M^{'}< M \right). The ratio of de Broglie wavelength of two parts will be:

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