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Day 33: JEE Mains Physics

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

  1. Question 1

    Thermodynamics. Asked 4 times: 27 Jun 2022*, 1 Feb 2024*, 8 Apr 2024, 21 Jan 2026 S2 (* = numbers or wording changed that year) See all 4 times it was asked

    25
    A diatomic gas (γ=1.4)(\gamma = 1.4) does 100 J of work when it is expanded isobarically. Then the heat given to the gas ____\_\_\_\_ J.

  2. Question 2

    Kinetic Theory. Asked 4 times: 26 Jun 2022*, 30 Jan 2023*, 15 Apr 2023*, 7 Apr 2025 (* = numbers or wording changed that year) See all 4 times it was asked

    82
    The helium and argon are put in the flask at the same room temperature ( 300 K ). The ratio of average kinetic energies (per molecule) of helium and argon is : (Give : Molar mass of helium =4 g/mol= 4\text{ }g/mol, Molar mass of argon =40 g/mol= 40\text{ }g/mol )

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  3. Question 3

    Mechanical Properties of Fluids. Asked 4 times: 25 Jan 2023, 30 Jan 2024, 1 Feb 2024, 6 Apr 2024 See all 4 times it was asked

    23
    A big drop is formed by coalescing 1000 small droplets of water. The ratio of surface energy of 1000 droplets to that of energy of big drop is 10x\frac{10}{x}. The value of xx is_____________.

  4. Question 4

    Dual Nature of Radiation and Matter. Asked 4 times: 2021 Paper 26*, 14 Jun 2022, 28 Jul 2022*, 1 Feb 2023 (* = numbers or wording changed that year) See all 4 times it was asked

    104
    The threshold frequency of a metal is f0f_{0}. When the light of frequency 2f02f_{0} is incident on the metal plate, the maximum velocity of photoelectrons is v1v_{1}. When the frequency of incident radiation is increased to 5f05f_{0}, the maximum velocity of photoelectrons emitted is v2v_{2}. The ratio of v1v_{1} to v2v_{2} is:

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  5. Question 5

    Ray Optics. This type asked 4 times: 22 Jan 2025, 23 Jan 2025, 24 Jan 2025, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 4 of this type

    5
    A thin biconvex lens is prepared from the glass ( μ=1.5\mu= 1.5 ) both curved surfaces of which have equal radii of 20 cm each. Left side surface of the lens is silvered from outside to make it reflect. To have the position of image and object at the same place, the object should be placed, from the lens at a distance of ____\_\_\_\_ cm.

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