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Day 379: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 12 Apr 2023 (same type asked 7 times) See all 7 of this type

    27
    The current flowing through a conductor connected across a source is 2 A2\text{ }A and 1.2 A1.2\text{ }A at 0∘C0^{\circ}C and 100∘C100^{\circ}C respectively. The current flowing through the conductor at 50∘C50^{\circ}C will be___ ×102 mA\times10^{2}\text{ }mA.

  2. Question 2

    Units and Measurements. Asked once: 2021 Paper 25 (same type asked 7 times) See all 7 of this type

    20
    In a typical combustion engine the work done by a gas molecule is given by W=α2βe−βx2kTW =\alpha^{2}\beta e^{\frac{- \beta x^{2}}{kT}}, where xx is the displacement, kk is the Boltzmann constant and TT is the temperature. If α\alpha and β\beta are constants, dimensions of α\alpha will be:

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  3. Question 3

    Oscillations. Asked once: 2021 Paper 16 (same type asked 7 times) See all 7 of this type

    1
    Energy of an oscillating system is E. At a particular instant kinetic energy of system is 3E/4. Find displacement of the oscillating particle from its mean position. Its amplitude of oscillation is A.

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  4. Question 4

    Nuclei. Asked once: 2021 Paper 20 (same type asked 7 times) See all 7 of this type

    2
    There are 101010^{10} radioactive nuclei in a given radioactive element, Its half-life time is 1 minute. How many nuclei will remain after 30 seconds? (2=1.414)(\sqrt{2}= 1.414)

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  5. Question 5

    Thermodynamics. Asked once: 2021 Paper 7 (same type asked 7 times) See all 7 of this type

    14
    A Carnot's engine working between 400 K400\text{ }K and 800 K800\text{ }K has a work output of 1200 J1200\text{ }J per cycle. The amount of heat energy supplied to the engine from the source in each cycle is:

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