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Day 72: JEE Mains Physics

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

  1. Question 1

    Dual Nature of Radiation and Matter. This type asked 3 times: 6 Apr 2023, 30 Jan 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    87
    In photoelectric effect, the stopping potential (Vo)\left( V_{o} \right) v/sv/s frequency ( v ) curve is plotted. ( h is the Planck's constant and ϕ0\phi_{0} is work function of metal) (A) V0v/svV_{0}v/sv is linear (B) The slope of V0v/svV_{0}v/sv curve =ϕ0 h=\frac{\phi_{0}}{\text{ }h} (C) h constant is related to the slope of V0v/svV_{0}v/sv line (D) The value of electric charge of electron is not required to determine h using the V0v/svV_{0}v/sv curve. (E) The work function can be estimated without knowing the value of hh. Choose the correct answer from the options given below :

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  2. Question 2

    Electromagnetic Waves. This type asked 3 times: 26 Jun 2022, 4 Apr 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    77
    Arrange the following in the ascending order of wavelength ( λ\lambda ) : (A) Microwaves (λ1)\left( \lambda_{1} \right) (B) Ultraviolet rays (λ2)\left( \lambda_{2} \right) (C) Infrared rays (λ3)\left( \lambda_{3} \right) (D) X-rays (λ4)\left( \lambda_{4} \right) Choose the most appropriate answer from the options given below :-

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  3. Question 3

    Electrostatics. This type asked 3 times: 29 Jul 2022, 6 Apr 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    93
    A small uncharged conducting sphere is placed in contact with an identical sphere but having 4×10−84 \times10^{- 8} C charge and then removed to a distance such that the force of repulsion between them is 9×10−3 N9 \times10^{- 3}\text{ }N. The distance between them is (Take 14πε0\frac{1}{4\pi\varepsilon_{0}} as 9×1099 \times10^{9} in SI units)

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  4. Question 4

    Gravitation. This type asked 3 times: 28 Jul 2022, 27 Jan 2024, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    100
    Acceleration due to gravity on the surface of earth is ' gg '. If the diameter of earth is reduced to one third of its original value and mass remains unchanged, then the acceleration due to gravity on the surface of the earth is _____\_\_\_\_\_ g.

  5. Question 5

    Mechanical Properties of Fluids. This type asked 3 times: 15 Apr 2023, 23 Jan 2025, 24 Jan 2025. This one: 24 Jan 2025 See all 3 of this type

    3
    An air bubble of radius 0.1 cm lies at a depth of 20 cm below the free surface of a liquid of density 1000 kg/m31000\text{ }kg/m^{3}. If the pressure inside the bubble is 2100 N/m22100\text{ }N/m^{2} greater than the atmospheric pressure, then the surface tension of the liquid in SI unit is (use g=10 m/s2g = 10\text{ }m/s^{2} )

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