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Day 38: JEE Mains Physics

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

  1. Question 1

    Kinetic Theory. This type asked 4 times: 2021 Paper 6, 13 Apr 2023, 5 Apr 2024, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 4 of this type

    4
    The mean free path of a molecule of diameter 5×10−10 m5 \times 10^{- 10}\text{ }m at the temperature 41∘C41^{\circ}C and pressure 1.38×105 Pa1.38 \times 10^{5}\text{ }Pa, is given as ____\_\_\_\_ m. (Given kB=1.38×10−23 J/Kk_{B} = 1.38 \times 10^{- 23}\text{ }J/K).

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  2. Question 2

    Thermodynamics. This type asked 4 times: 15 Apr 2023, 5 Apr 2024, 24 Jan 2025, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 4 of this type

    22
    A thermodynamic system is taken through the cyclic process ABC as shown in the figure. The total work done by the system during the cycle ABC is ____\_\_\_\_ J.

  3. Question 3

    Current Electricity. This type asked 4 times: 27 Jun 2022, 29 Jan 2023, 4 Apr 2024, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 4 of this type

    3
    In the potentiometer, when the cell in the secondary circuit is shunted with 4Ω4\Omega resistance, the balance is obtained at the length 120 cm of wire. Now when the same cell in shunted with 12Ω12\Omega resistance, the balance is shifted to a length of 180 cm . The internal resistance of cell is ____\_\_\_\_ Ω\Omega.

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  4. Question 4

    Electromagnetic Waves. This type asked 4 times: 2021 Paper 20, 2021 Paper 24, 22 Jan 2026 S1, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 4 of this type

    7
    The electric field of an electromagnetic wave travelling through a medium is given by E→(x,t)=25sin⁡(2.0×1015t−107x)n^\overrightarrow{E}(x,t) = 25\sin\left( 2.0 \times10^{15}t-10^{7}x \right)\widehat{n} then the refractive index of the medium is ____\_\_\_\_.(All given measurement are in SI units)

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  5. Question 5

    Thermal Properties of Matter. This type asked 4 times: 25 Jun 2022, 25 Jul 2022, 29 Jan 2023, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 4 of this type

    1
    10 kg of ice at −10∘C-10^{\circ}C is added to 100 kg of water to lower its temperature from 25∘C25^{\circ}C. Consider no heat exchange to surroundings. The decrement to the temperature of water is ____\_\_\_\_  ∘C\ ^{\circ}C. (specific heat of ice =2100 J/Kg. ∘C= 2100\text{ }J/Kg.\ ^{\circ}C, specific heat of water =4200 J/Kg. ∘C= 4200\text{ }J/Kg.\ ^{\circ}C, latent heat of fusion of ice =3.36×105 J/Kg= 3.36 \times10^{5}\text{ }J/Kg )

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