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Day 381: JEE Mains Physics

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

  1. Question 1

    Mechanical Properties of Fluids. Asked once: 11 Apr 2023 (same type asked 6 times) See all 6 of this type

    119
    The surface tension of soap solution is 3.5×10−23.5 \times10^{- 2} Nm−1Nm^{- 1}. The amount of work done required to increase the radius of soap bubble from 10 cm10\text{ }cm to 20 cm20\text{ }cm___ is x×10−4 Jx \times10^{- 4}\text{ }J.

  2. Question 2

    Atoms. Asked once: 1 Feb 2023 (same type asked 6 times) See all 6 of this type

    23
    A light of energy 12.75eV12.75eV is incident on a hydrogen atom in its ground state. The atom absorbs the radiation and reaches to one of its excited states. The angular momentum of the atom in the excited state is xπ×10−17eVs\frac{x}{\pi}\times10^{- 17}eVs. The value of xx is ___ (use h=4.14×10−15eVs,c=3×108 ms−1h = 4.14 \times10^{- 15}eVs,c = 3 \times10^{8}{\text{ }ms}^{- 1} ).

  3. Question 3

    Dual Nature of Radiation and Matter. Asked once: 31 Jan 2023 (same type asked 6 times) See all 6 of this type

    16
    If a source of electromagnetic radiation having power 15 kW15\text{ }kW produces 101610^{16} photons per second, the radiation belongs to a part of spectrum is. (Take Planck constant =6×10−34Js= 6 \times10^{- 34}Js )

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  4. Question 4

    Nuclei. Asked once: 31 Jan 2024 (same type asked 6 times) See all 6 of this type

    120
    A nucleus has mass number A1A_{1} and volume V1V_{1}. Another nucleus has mass number A2A_{2} and volume V2V_{2}. If relation between mass number is A2=4A1A_{2}= 4A_{1}, then V2V1=\frac{V_{2}}{V_{1}}= ______

  5. Question 5

    Moving Charges and Magnetism. Asked once: 28 Jun 2022 (same type asked 6 times) See all 6 of this type

    103
    Two parallel, long wires are kept 0.20 m0.20\text{ }m apart in vacuum, each carrying current of xAxA in the same direction. If the force of attraction per meter of each wire is 2×10−6 N2 \times10^{- 6}\text{ }N, then the value of xx is approximately:

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