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Day 149: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked once: 4 Apr 2026 S1 (same type asked 7 times) See all 7 of this type

    4
    Two nuclei of mass number 3 combine with another nucleus of mass number 4 to yield a nucleus of mass number 10. If the binding energy per nucleon for the mass number 3, 4 and 10 are 5.6MeV,7.4MeV5.6MeV,7.4MeV and 6.1 MeV , respectively, then in the process, ΔMc2=\Delta Mc^{2}= ____\_\_\_\_ MeV .

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  2. Question 2

    Alternating Current. Asked once: 4 Apr 2026 S1 (same type asked 7 times) See all 7 of this type

    25
    An inductor of 10 mH , capacitor of 0.1μ F0.1\mu\text{ }F and a resistor of 100Ω100\Omega are connected in series aross an a.c power supply 220 V,70 Hz220\text{ }V,70\text{ }Hz. The power factor of the given circuit is 0.5 . The difference in the inductive reactance and capacitance reactance is 3αΩ\sqrt{3}\alpha\Omega. The value of α\alpha is ____\_\_\_\_ .

  3. Question 3

    Atoms. Asked once: 7 Apr 2025 (same type asked 7 times) See all 7 of this type

    16
    For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series is.

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  4. Question 4

    Ray Optics. Asked once: 2 Apr 2026 S2 (same type asked 7 times) See all 7 of this type

    24
    If sunlight is focused on a paper using convex lens, it starts burning the paper in shortest time when the lens is kept at 30 cm above the paper. If the radius of curvature of the lens is 60 cm then the refractive index of the lens material is α10\frac{\alpha}{10}. The value of α\alpha is ____\_\_\_\_.

  5. Question 5

    Wave Optics. Asked once: 21 Jan 2026 S2 (same type asked 7 times) See all 7 of this type

    24
    In a Young's double slit experiment set up, the two slits are kept 0.4 mm0.4\text{ }mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness 20μ m20\mu\text{ }m is introduced in front of one of the slits then central bright fringe shifts by 20 mm on the screen. The refractive index of transparent sheet is given by α10\frac{\alpha}{10}, where α\alpha is ____\_\_\_\_ .