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Day 221: JEE Mains Physics

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

  1. Question 1

    System of Particles and Rotational Motion. Asked once: 2021 Paper 15 (same type asked 2 times) See all 2 of this type

    8
    A disc of radius 2 metres and mass M, is rotating with 200rpm200rpm. Find the torque required to stop the disc in 10 seconds.

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  2. Question 2

    Work, Energy and Power. Asked once: 2021 Paper 24 (same type asked 2 times) See all 2 of this type

    4
    A body of mass 'm' dropped from a height ' hh ' reaches the ground with a speed of 0.8gh0.8\sqrt{gh}. The value of workdone by the air-friction is:

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  3. Question 3

    Oscillations. Asked once: 2021 Paper 10 (same type asked 2 times) See all 2 of this type

    14
    The function of time representing a simple harmonic motion with a period of πω\frac{\pi}{\omega} is:

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  4. Question 4

    Units and Measurements. Asked once: 29 Jan 2024 (same type asked 2 times) See all 2 of this type

    8
    The resistance R=VIR =\frac{V}{I} where V=(200±5)VV = (200 \pm 5)V and I=(20±0.2)AI = (20 \pm 0.2)A, the percentage error in the measurement of RR is:

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  5. Question 5

    Alternating Current. Asked once: 30 Jan 2024 (same type asked 2 times) See all 2 of this type

    20
    A series L, R circuit connected with an ac source E=(25sin⁡1000t)VE = (25\sin1000t)V has a power factor of 12\frac{1}{\sqrt{2}}. If the source of emf is changed to E=(20sin⁡2000E = (20\sin2000 t)Vt)V, the new power factor of the circuit will be :

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