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Day 255: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 8 Apr 2024 (same type asked 9 times) See all 9 of this type

    103
    A capacitor has air as dielectric medium and two conducting plates of area 12 cm212{\text{ }cm}^{2} and they are 0.6 cm0.6\text{ }cm apart. When a slab of dielectric having area 12 cm212{\text{ }cm}^{2} and 0.6 cm0.6\text{ }cm thickness is inserted between the plates, one of the conducting plates has to be moved by 0.2 cm0.2\text{ }cm to keep the capacitance same as in previous case. The dielectric constant of the slab is : (Given ϵ0=8.834×10−12 F/m\epsilon_{0}= 8.834 \times10^{- 12}\text{ }F/m )

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  2. Question 2

    Kinetic Theory. Asked once: 6 Apr 2024 (same type asked 9 times) See all 9 of this type

    14
    A sample contains mixture of helium and oxygen gas. The ratio of root mean square speed of helium and oxygen in the sample, is:

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  3. Question 3

    Kinetic Theory. Asked once: 22 Jan 2025 (same type asked 9 times) See all 9 of this type

    83
    For a diatomic gas, if γ1=(CpCv)\gamma_{1}=\left( \frac{Cp}{Cv} \right) for rigid molecules and γ2=(CpCv)\gamma_{2}=\left( \frac{Cp}{Cv} \right) for another diatomic molecules, but also having vibrational modes. Then, which one of the following options is correct ? (Cp and Cv are specific heats of the gas at constant pressure and volume)

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  4. Question 4

    Current Electricity. Asked once: 12 Apr 2023 (same type asked 9 times) See all 9 of this type

    8
    A wire of resistance 160Ω160\Omega is melted and drawn in wire of one-fourth of its length. The new resistance of the wire will be

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  5. Question 5

    Dual Nature of Radiation and Matter. Asked once: 25 Jul 2022 (same type asked 8 times) See all 8 of this type

    17
    A metal exposed to light of wavelength 800 nm800\text{ }nm and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photo-electron doubles when light of wavelength 500 nm500\text{ }nm is used. The work function of the metal is (Take hc =1230eV−nm)= 1230eV - nm).

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