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Day 582: JEE Mains Physics

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

  1. Question 1

    System of Particles and Rotational Motion. Asked once: 27 Jun 2022

    112
    A rolling wheel of 12 kg12\text{ }kg is on an inclined plane at position PP and connected to a mass of 3 kg3\text{ }kg through a string of fixed length and pulley as shown in figure. Consider PR as friction free surface. The velocity of centre of mass of the wheel when it reaches at the bottom QQ of the inclined plane PQPQ will be 12xghm/s\frac{1}{2}\sqrt{xgh}m/s. The value of xx is

  2. Question 2

    Thermodynamics. Asked once: 2021 Paper 2

    12
    If one mole of an ideal gas at (P1,V1)\left( P_1, V_1 \right) is allowed to expand reversibly and isothermally (A →\rightarrow B) its pressure is reduced to one-half of the original pressure (see figure). This is followed by a constant volume cooling till its pressure is reduced to one-fourth of the initial value (B→C)(B \rightarrow C). Then it is restored to its initial state by a reversible adiabatic compression (C →\rightarrow A). The net workdone by the gas is equal to:

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  3. Question 3

    Units and Measurements. Asked once: 2021 Paper 4

    20
    If ee is the electronic charged, cc is the speed of light in free space and hh is planck's constant, the quantity 14πε0∣e∣2hc\frac{1}{4\pi\varepsilon_{0}}\frac{|e|^{2}}{hc} has dimensions of:

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  4. Question 4

    Work, Energy and Power. Asked once: 2021 Paper 13

    21
    An 80 kg80\text{ }kg object brought down by 80 cm80\text{ }cm at constant speed. Find work done by external agent.

  5. Question 5

    Current Electricity. Asked once: 5 Apr 2024

    19
    In the given figure R1=10Ω,R2=8Ω,R3=4ΩR_{1}= 10\Omega,R_{2}= 8\Omega,R_{3}= 4\Omega and R4=8ΩR_{4}= 8\Omega. Battery is ideal with emf 12 V12\text{ }V. Equivalent resistant of the circuit and current supplied by battery are respectively.

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