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Day 636: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 2021 Paper 25

    8
    Five equal resistances are connected in a network as shown in figure. The net resistance between the points AA and BB is:

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  2. Question 2

    Semiconductor Electronics. Asked once: 2021 Paper 4

    19
    The truth table for the following logic circuit is:

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  3. Question 3

    Current Electricity. Asked once: 2021 Paper 25

    26
    In an electrical circuit, a battery is connected to pass 20C20C of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at 15 V15\text{ }V. The work done by the battery is ___ J.

  4. Question 4

    Semiconductor Electronics. Asked once: 2021 Paper 3

    1
    A 5V battery is connected across the points XX and YY. Assume D1D_{1} and D2D_{2} to be normal silicon diodes. Find the current supplied by the battery if the +ve terminal of the battery is connected to point XX.

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  5. Question 5

    Current Electricity. Asked once: 2021 Paper 24

    7
    Due to cold weather a 1 m1\text{ }m water pipe of cross-sectional area 1 cm21{\text{ }cm}^{2} is filled with ice at −10∘C-10^{\circ}C. Resistive heating is used to melt the ice. Current of 0.5 A0.5\text{ }A is passed through 4kΩ4k\Omega resistance. Assuming that all the heat produced is used for melting, what is the minimum time required? (Given latent heat of fusion for water/ice =3.33×105 J kg−1= 3.33 \times10^{5}\text{ }J{\text{ }kg}^{- 1}, specific heat of ice =2×103 J= 2 \times10^{3}\text{ }J kg−1kg^{- 1} and density of ice =103 kg/m3=10^{3}\text{ }kg/m^{3}

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