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Day 426: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 2021 Paper 21 (same type asked 11 times) See all 11 of this type

    29
    A plane electromagnetic wave with frequency of 30MHz30MHz travels in free space. At particular point in space and time, electric field is 6 V/m6\text{ }V/m. The magnetic field at this point will be x×10−8 Tx \times10^{- 8}\text{ }T. The value of xx is

  2. Question 2

    Units and Measurements. Asked once: 25 Jun 2022 (same type asked 10 times) See all 10 of this type

    1
    If Z=A2B3C4Z=\frac{A^{2}B^{3}}{C^{4}}, then the relative error in ZZ will be:

    Tap an option to check your answer.

  3. Question 3

    Alternating Current. Asked once: 2021 Paper 17 (same type asked 10 times) See all 10 of this type

    8
    A 100Ω100\Omega resistance, a 0.1μF0.1\mu F capacitor and an inductor are connected in series across a 250 V250\text{ }V supply at variable frequency. Calculate the value of inductance of inductor at which resonance will occur. Given that the resonant frequency is 60 Hz60\text{ }Hz.

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  4. Question 4

    Mechanical Properties of Fluids. Asked once: 2021 Paper 25 (same type asked 10 times) See all 10 of this type

    15
    A large number of water drops, each of radius rr, combine to have a drop of radius RR. If the surface tension is TT and mechanical equivalent of heat is JJ, the rise in heat energy per unit volume will be:

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  5. Question 5

    Wave Optics. Asked once: 27 Jan 2024 (same type asked 10 times) See all 10 of this type

    117
    A parallel beam of monochromatic light of wavelength 5000Å5000\text{Å} is incident normally on a single narrow slit of width 0.001 mm. The light is focused by convex lens on screen, placed on its focal plane. The first minima will be formed for the angle of diffraction of _____(degree).