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Day 154: JEE Mains Physics

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

  1. Question 1

    Wave Optics. Asked once: 10 Apr 2023 (same type asked 6 times) See all 6 of this type

    21
    Unpolarised light of intensity 32Wm−232Wm^{- 2} passes through the combination of three polaroids such that the pass axis of the last polaroid is perpendicular to that of the pass axis of first polaroid. If intensity of emerging light is 3Wm−23Wm^{- 2}, then the angle between pass axis of first two polaroids is ____\_\_\_\_ degrees.

  2. Question 2

    Mechanical Properties of Fluids. Asked once: 2 Apr 2026 S2 (same type asked 6 times) See all 6 of this type

    8
    The surface tension of a soap bubble is 0.03 N/m0.03\text{ }N/m. The work done in increasing the diameter of bubble from 2 cm to 6 cm is απ×10−4 J\alpha\pi\times10^{- 4}\text{ }J. The value of α\alpha is ____\_\_\_\_ . (Take π=3.14\pi= 3.14 )

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  3. Question 3

    Atoms. Asked once: 21 Jan 2026 S2 (same type asked 6 times) See all 6 of this type

    16
    The energy of an electron in an orbit of the Bohr's atom is −0.04E0eV- 0.04E_{0}eV where E0E_{0} is the ground state energy. If L is the angular momentum of the electron in this orbit and h is the Planck's constant, then 2π L h\frac{2\pi\text{ }L}{\text{ }h} is ____\_\_\_\_ :

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  4. Question 4

    Dual Nature of Radiation and Matter. Asked once: 24 Jan 2025 (same type asked 6 times) See all 6 of this type

    98
    The ratio of the power of a light source S1S_{1} to that the light source S2S_{2} is 2 . S1S_{1} is emitting 2×10152 \times10^{15} photons per second at 600 nm . If the wavelength of the source S2S_{2} is 300 nm , then the number of photons per second emitted by S2S_{2} is ______\_\_\_\_\_\_ ×1014\times10^{14}.

  5. Question 5

    Nuclei. Asked once: 28 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    6
    An atom  38X\ _{3}^{8}X is bombarded by shower of fundamental particles and in 10 s this atom absorbed 10 electrons, 10 protons and 9 neutrons. The percentage growth in the surface area of the nucleus is recorded by :

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