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Day 388: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 25 Jun 2022 (same type asked 5 times) See all 5 of this type

    103
    The electromagnetic waves travel in a medium at a speed of 2.0×108 m/s2.0 \times10^{8}\text{ }m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be:

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  2. Question 2

    Electrostatics. Asked once: 2021 Paper 4 (same type asked 5 times) See all 5 of this type

    8
    A charge ' qq ' is placed at one corner of a cube as shown in figure. The flux of electrostatic field E→\overrightarrow{E} though the shaded area is:

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  3. Question 3

    Wave Optics. Asked once: 29 Jun 2022 (same type asked 5 times) See all 5 of this type

    19
    Using Young's double slit experiment, a monochromatic light of wavelength 5000Å5000\text{Å} produces fringes of fringe width 0.5 mm0.5\text{ }mm. If another monochromatic light of wavelength 6000Å6000\text{Å} is used and the separation between the slits is doubled, then the new fringe width will be:

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  4. Question 4

    Dual Nature of Radiation and Matter. Asked once: 13 Apr 2023 (same type asked 5 times) See all 5 of this type

    8
    The difference between threshold wavelengths for two metal surfaces A and B having work function ϕA=9eV\phi_{A}= 9eV and ϕB=4.5eV\phi_{B}= 4.5eV in nmnm is: (Given, hc =1242eVnm= 1242eVnm )

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  5. Question 5

    Electrostatics. Asked once: 2021 Paper 26 (same type asked 5 times) See all 5 of this type

    28
    27 similar drops of mercury are maintained at 10 V10\text{ }V each. All these spherical drops combine into a single big drop. The potential energy of the bigger drop is ____\_\_\_\_ times that of a smaller drop.