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Day 16: JEE Mains Physics

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

  1. Question 1

    Atoms. This type asked 6 times: 31 Jan 2023, 6 Apr 2023, 13 Apr 2023, 27 Jan 2024, 2 Apr 2025, 4 Apr 2025. This one: 4 Apr 2025 See all 6 of this type

    20
    Considering the Bohr model of hydrogen like atoms, the ratio of the radius of the 5th 5^{\text{th~}} orbit of the electron in Li2+Li^{2 +} to that in He+He^{+} is

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  2. Question 2

    Kinetic Theory. This type asked 6 times: 28 Jun 2022, 10 Apr 2023, 27 Jan 2024, 31 Jan 2024, 6 Apr 2024, 2 Apr 2025. This one: 2 Apr 2025 See all 6 of this type

    97
    The internal energy of air i n 4 m×4 m×3 m4\text{ }m \times 4\text{ }m \times 3\text{ }m sized room at 1 atmospheric pressure will be ____\_\_\_\_ ×106 J\times 10^{6}\text{ }J. (Consider air as diatomic molecule)

  3. Question 3

    Moving Charges and Magnetism. This type asked 6 times: 28 Jul 2022, 31 Jan 2023, 10 Apr 2023, 11 Apr 2023, 23 Jan 2025, 2 Apr 2025. This one: 2 Apr 2025 See all 6 of this type

    77
    In a moving coil galvanometer, two moving coils M1M_{1} and M2M_{2} have the following particulars:
    R1=5Ω, N1=15, A1=3.6×10−3 m2, B1=0.25 TR_{1}= 5\Omega,{\text{ }N}_{1}= 15,{\text{ }A}_{1}= 3.6 \times10^{- 3}{\text{ }m}^{2},{\text{ }B}_{1}= 0.25\text{ }T
    R2=7Ω, N2=21, A2=1.8×10−3 m2, B2=0.50 TR_{2}= 7\Omega,{\text{ }N}_{2}= 21,{\text{ }A}_{2}= 1.8 \times10^{- 3}{\text{ }m}^{2},{\text{ }B}_{2}= 0.50\text{ }T
    Assuming that torsional constant of the springs are same for both coils, what will be the ratio of voltage sensitivity of M1M_{1} and M2M_{2} ?

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  4. Question 4

    Units and Measurements. This type asked 6 times: 29 Jun 2022, 1 Feb 2023, 13 Apr 2023, 27 Jan 2024, 5 Apr 2024, 2 Apr 2025. This one: 2 Apr 2025 See all 6 of this type

    2
    The equation for real gas is given by (P+aV2)(V−b)=RT\left( P +\frac{a}{V^{2}} \right)(V - b) = RT, where P,V,TP,V,T and R are the pressure, volume, temperature and gas constant, respectively. The dimension of ab−2ab^{- 2} is equivalent to that of :

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  5. Question 5

    Atoms. This type asked 6 times: 2021 Paper 21, 11 Apr 2023, 12 Apr 2023, 30 Jan 2024, 9 Apr 2024, 29 Jan 2025. This one: 29 Jan 2025 See all 6 of this type

    95
    The number of spectral lines emitted by atomic hydrogen that is in the 4th 4^{\text{th~}} energy level, is

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