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Day 15: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. This type asked 6 times: 2021 Paper 23, 30 Jan 2023, 30 Jan 2024, 1 Feb 2024, 24 Jan 2025, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 6 of this type

    4
    The current passing through a conducting loop in the form of equilateral triangle of side 43 cm4\sqrt{3}\text{ }cm is 2A. The magnetic field at its centroid is α×10−5 T\alpha \times 10^{- 5}\text{ }T. The value of α\alpha is ____\_\_\_\_ . (Given : μo=4π×10−7\mu_{o} = 4\pi \times 10^{- 7} SI units)

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  2. Question 2

    Ray Optics. This type asked 6 times: 25 Jun 2022, 29 Jun 2022, 26 Jul 2022, 11 Apr 2023, 8 Apr 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 6 of this type

    11
    Consider light travelling from a medium A to medium B separated by a plane interface. If the light undergoes total internal reflection during its travel from medium A to B and the speed of light in media AA and BB are 2.4×108 m/s2.4 \times10^{8}\text{ }m/s and 2.7×108 m/s2.7 \times10^{8}\text{ }m/s respectively, then the value of critical angle is :

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  3. Question 3

    Atoms. This type asked 6 times: 2021 Paper 7, 31 Jan 2023, 1 Feb 2023, 11 Apr 2023, 2 Apr 2025, 7 Apr 2025. This one: 7 Apr 2025 See all 6 of this type

    15
    In a hydrogen like ion, the energy difference between the 2nd 2^{\text{nd~}} excitation energy state and ground is 108.8 eV . The atomic number of the ion is

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  4. Question 4

    Mechanical Properties of Solids. This type asked 6 times: 25 Jul 2022, 30 Jan 2023, 10 Apr 2023, 15 Apr 2023, 29 Jan 2024, 7 Apr 2025. This one: 7 Apr 2025 See all 6 of this type

    19
    Two wires AA and BB are made of same material having ratio of lengths LALB=13\frac{L_{A}}{L_{B}}=\frac{1}{3} and their diameters ratio dAdB=2\frac{d_{A}}{d_{B}}= 2. If both the wires are stretched using same force, what would be the ratio of their respective elongations?

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  5. Question 5

    Thermodynamics. This type asked 6 times: 2021 Paper 1, 25 Jan 2023, 11 Apr 2023, 23 Jan 2025, 4 Apr 2025, 7 Apr 2025. This one: 7 Apr 2025 See all 6 of this type

    92
    Match List-I with List-II.
    List-IList-II
    (A) Isothermal(I) ΔW\Delta W (work done) =0= 0
    (B) Adiabatic(II) ΔQ\Delta Q (supplied heat) =0= 0
    (C) Isobaric(III) ΔU\Delta U (change in internal energy) ≠0\neq 0
    (D) Isochoric(IV) ΔU=0\Delta U = 0
    Choose the correct answer from the options given below:

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