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Day 21: 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 5 times: 26 Jun 2022, 6 Apr 2024, 9 Apr 2024, 23 Jan 2025, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 5 of this type

    16
    Light source having wavelength 331 nm is used to generate photoelectrons whose stopping potential is 0.2 V . The work function of the used metal in the experiment is α×10−19 J\alpha \times10^{- 19}\text{ }J. The value of α\alpha is____\_\_\_\_ . ( h=6.62×10−34 J s,e=1.6×10−19Ch = 6.62 \times10^{- 34}\text{ }J\text{ }s,e = 1.6 \times10^{- 19}C and c =3×108 m/s= 3 \times10^{8}\text{ }m/s )

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  2. Question 2

    Electromagnetic Waves. This type asked 5 times: 29 Jun 2022, 1 Feb 2024, 22 Jan 2025, 23 Jan 2025, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 5 of this type

    12
    A displacement current of 4.0 A can be set up in the space between two parallel plates of 6μ F6\mu\text{ }F capacitor. The rate of change of potential difference across the plates of the capacitor is nearly α×106 V/s\alpha \times10^{6}\text{ }V/s. The value of α\alpha is ____\_\_\_\_ .

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  3. Question 3

    Wave Optics. This type asked 5 times: 28 Jun 2022, 26 Jul 2022, 22 Jan 2025, 24 Jan 2025, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 5 of this type

    14
    In Young's double slit experiment, the fringes width of the interferences pattern produced on the screen is 2.4μ m2.4\mu\text{ }m. If the experiment is carried out in another medium having refractive index 1.2, the fringe width will be ____\_\_\_\_ μm\mu m.

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  4. Question 4

    Mechanical Properties of Solids. This type asked 5 times: 14 Jun 2022, 1 Feb 2023, 24 Jan 2025, 28 Jan 2025, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 5 of this type

    2
    The increase in the pressure required to decrease the volume ( ΔV\Delta V ) of water is 6.3×107 N/m26.3 \times10^{7}\text{ }N/m^{2}. The percentage decrease in the volume is ____\_\_\_\_ . (Bulk modulus of water =2.1×109 N/m2= 2.1 \times10^{9}\text{ }N/m^{2})

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  5. Question 5

    Gravitation. This type asked 5 times: 26 Jul 2022, 27 Jul 2022, 30 Jan 2023, 15 Apr 2023, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 5 of this type

    6
    If a body of mass 1 kg falls on the earth from infinity, it attains velocity (v) and kinetic energy (k) on reaching the surface of earth. The values of v and k respectively are ____\_\_\_\_ . (Take radius of earth to be 6400 km and g=9.8 m/s2g = 9.8\text{ }m/s^{2} )

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