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Day 8: JEE Mains Physics

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

  1. Question 1

    Thermodynamics. This type asked 7 times: 2021 Paper 17, 2021 Paper 23, 1 Feb 2023, 4 Apr 2024, 9 Apr 2024, 2 Apr 2026 S1, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 7 of this type

    11
    Initial pressure and volume of a monoatomic ideal gas are P and V. The change in internal energy of this gas in adiabatic expansion to volume Vfinal =27 VV_{\text{final~}}= 27\text{ }V is ____\_\_\_\_ J.

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  2. Question 2

    Nuclei. This type asked 7 times: 14 Jun 2022, 26 Jul 2022, 8 Apr 2023, 27 Jan 2024, 2 Apr 2025, 4 Apr 2026 S1, 6 Apr 2026 S2. This one: 6 Apr 2026 S2 See all 7 of this type

    16
    The energy released if two  12H\ _{1}^{2}H (deuterium) atoms are combined to form  24He\ _{2}^{4}He is ____\_\_\_\_ MeV. (Take binding energies per nucleon of  12H\ _{1}^{2}H and  24He\ _{2}^{4}He as 1.1 MeV and 7.2 MeV, respectively).

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  3. Question 3

    Alternating Current. This type asked 7 times: 2021 Paper 10, 25 Jun 2022, 25 Jan 2023, 27 Jan 2024, 24 Jan 2026 S1, 4 Apr 2026 S1, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 7 of this type

    20
    A LCR series circuit driven with Erms=90 VE_{rms}= 90\text{ }V at frequency fd=30 Hzf_{d}= 30\text{ }Hz has resistance R=80ΩR = 80\Omega, an inductance with inductive reactance XL=20.0ΩX_{L}= 20.0\Omega and capacitance with capacitive reactance XC=80.0ΩX_{C}= 80.0\Omega. The power factor of the circuit is ____\_\_\_\_ .

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  4. Question 4

    Atoms. This type asked 7 times: 2021 Paper 25, 25 Jan 2023, 8 Apr 2023, 31 Jan 2024, 6 Apr 2024, 7 Apr 2025, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 7 of this type

    19
    The ratio of momentum of the photons of the 1st 1^{\text{st~}} and 2nd 2^{\text{nd~}} line of Balmer series of Hydrogen atoms is α/β\alpha/\beta. The possible values of α\alpha and β\beta are :-

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  5. Question 5

    Ray Optics. This type asked 7 times: 2021 Paper 7, 6 Apr 2024, 2 Apr 2025, 3 Apr 2025, 28 Jan 2026 S1, 2 Apr 2026 S2, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 7 of this type

    16
    A convex lens is made from glass material having refractive index of 1.4 with same radius of curvature on both sides. The ratio of its focal length and radius of curvature is ____\_\_\_\_ .

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