PYQ Vault

Day 101: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked 2 times: 28 Jul 2022*, 10 Apr 2023 (* = numbers or wording changed that year) See all 2 times it was asked

    92
    The half-life of a radioactive substance is TT. The time taken, for disintegrating 78\frac{7}{8} th part of its original mass will be:

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  2. Question 2

    Oscillations. Asked 2 times: 2021 Paper 4*, 10 Apr 2023 (* = numbers or wording changed that year) See all 2 times it was asked

    19
    A particle executes S.H.M. of amplitude A along xx-axis. At t=0t = 0, the position of the particle is x=A2x =\frac{A}{2} and it moves along positive xx-axis the displacement of particle in time tt is x=Asin(ωt+δ)x = Asin(\omega t + \delta), then the value δ\delta will be:

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  3. Question 3

    Semiconductor Electronics. Asked 2 times: 2021 Paper 21*, 10 Apr 2023 (* = numbers or wording changed that year) See all 2 times it was asked

    3
    A zener diode of power rating 1.6 W1.6\text{ }W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V8\text{ }V and it has to regulate voltage fluctuating between 3 V3\text{ }V and 10 V10\text{ }V. The value of resistance RsR_{s} for safe operation of diode will be:

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  4. Question 4

    Magnetism and Matter. Asked 2 times: 14 Jun 2022, 8 Apr 2023 See all 2 times it was asked

    106
    Given below are two statements; one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Electromagnets are made of soft iron. Reason R: Soft iron has high permeability and low retentivity. In the light of above, statements, choose the most appropriate answer from the options given below.

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  5. Question 5

    Moving Charges and Magnetism. Asked 2 times: 24 Jan 2023, 8 Apr 2023 See all 2 times it was asked

    120
    The ratio of magnetic field at the centre of a current carrying coil of radius rr to the magnetic field at distance rr from the centre of coil on its axis is x:1\sqrt{x}:1. The value of xx is___