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Day 342: JEE Mains Physics

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

  1. Question 1

    Thermodynamics. Asked once: 14 Jun 2022 (same type asked 6 times) See all 6 of this type

    17
    A Carnot engine whose heat sinks at 27∘C27^{\circ}C, has an efficiency of 25%25\%. By how many degrees should the temperature of the source be changed to increase the efficiency by 100%100\% of the original efficiency?

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  2. Question 2

    Motion in a Straight Line. Asked once: 30 Jan 2024 (same type asked 5 times) See all 5 of this type

    26
    The displacement and the increase in the velocity of a moving particle in the time interval of tt to (t+1)s(t + 1)s are 125 m125\text{ }m and 50 m/s50\text{ }m/s, respectively. The distance travelled by the particle in (t+2)ths(t + 2)^{th}s is ____ mm.

  3. Question 3

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 19 (same type asked 5 times) See all 5 of this type

    2
    The de-Broglie wavelength of a particle having kinetic energy EE is λ\lambda. How much extra energy must be given to this particle so that the de-Broglie wavelength reduces to 75%75\% of the initial value?

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  4. Question 4

    Electromagnetic Induction. Asked once: 26 Jun 2022 (same type asked 5 times) See all 5 of this type

    12
    The magnetic flux through a coil perpendicular to its plane is varying according to the relation ϕ=\phi = (5t3+4t2+2t−5)\left( 5t^{3}+ 4t^{2} + 2t - 5 \right) Weber. If the resistance of the coil is 5ohm5ohm, then the induced current through the coil at t=2sect = 2sec will be:

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  5. Question 5

    Motion in a Straight Line. Asked once: 11 Apr 2023 (same type asked 5 times) See all 5 of this type

    2
    From the v−tv - t graph shown. the ratio of distance to displacement in 25 s25\text{ }s of motion

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