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Day 90: JEE Mains Physics

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

  1. Question 1

    Thermodynamics. Asked 2 times: 2021 Paper 1*, 3 Apr 2025 (* = numbers or wording changed that year) See all 2 times it was asked

    80
    An ideal gas exists in a state with pressure P0P_{0}, volume V0V_{0}. It is isothermally expanded to 4 times of its initial volume (V0)\left( V_{0} \right), then isobarically compressed to its original volume. Finally the system is heated isochorically to bring it to its initial state. The amount of heat exchanged in this process is

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  2. Question 2

    Work, Energy and Power. Asked 2 times: 28 Jun 2022*, 3 Apr 2025 (* = numbers or wording changed that year) See all 2 times it was asked

    94
    A block of mass 1 kg , moving along xx with speed vi=10 m/sv_{i}= 10\text{ }m/s enters a rough region ranging from x=0.1 mx = 0.1\text{ }m to x=1.9 mx = 1.9\text{ }m. The retarding force acting on the block in this range is Fr=−kxNF_{r}= - kxN, with k=10 N/mk = 10\text{ }N/m. Then the final speed of the block as it crosses rough region is.

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  3. Question 3

    Units and Measurements. Asked 2 times: 8 Apr 2023, 2 Apr 2025 See all 2 times it was asked

    93
    If μ0\mu_{0} and ε0\varepsilon_{0} are the permeability and permittivity of free space, respectively, then the dimension of (1μ0ε0)\left( \frac{1}{\mu_{0}\varepsilon_{0}} \right) is :

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  4. Question 4

    Wave Optics. Asked 2 times: 6 Apr 2024, 28 Jan 2025 See all 2 times it was asked

    83
    Which of the following phenomena can- not be explained by wave theory of light?

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  5. Question 5

    Mechanical Properties of Fluids. Asked 2 times: 15 Apr 2023*, 23 Jan 2025 (* = numbers or wording changed that year) See all 2 times it was asked

    96
    An air bubble of radius 1.0 mm is observed at a depth of 20 cm below the free surface of a liquid having surface tension 0.095 J/m20.095\text{ }J/m^{2} and density 103 kg/m310^{3}\text{ }kg/m^{3}. The difference between pressure inside the bubble and atmospheric pressure ____N/m2\_\_\_\_N/m^{2}. (Take g=10 m/s2g = 10\text{ }m/s^{2} )