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Day 420: JEE Mains Physics

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

  1. Question 1

    Waves. Asked once: 24 Jan 2023 (same type asked 9 times) See all 9 of this type

    18
    A travelling wave is described by the equation
    y(x,t)=[0.05sin⁡(8x−4t)]my(x,t) = \lbrack 0.05\sin(8x - 4t)\rbrack m
    The velocity of the wave is: [all the quantities are in SI unit]

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  2. Question 2

    Ray Optics. Asked once: 2021 Paper 6 (same type asked 9 times) See all 9 of this type

    11
    The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in a medium of same refractive index? (Assume the radii of curvature of the faces of lens are R1R_{1} and R2R_{2} respectively)

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  3. Question 3

    Electrostatics. Asked once: 25 Jun 2022 (same type asked 9 times) See all 9 of this type

    98
    Two metallic plates form a parallel plate capacitor. The distance between the plates is ' dd '. A metal sheet of thickness d2\frac{d}{2} and of area equal to area of each plate is introduced between the plates. What will be the ratio of the new capacitance to the original capacitance of the capacitor?

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  4. Question 4

    Kinetic Theory. Asked once: 2021 Paper 18 (same type asked 9 times) See all 9 of this type

    14
    The rms speeds of the molecules of Hydrogen, Oxygen and Carbondioxide at the same temperature are VH,VOV_{H},V_{O} and VCV_{C} respectively then:

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  5. Question 5

    Current Electricity. Asked once: 25 Jun 2022 (same type asked 9 times) See all 9 of this type

    118
    The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be ____\_\_\_\_ %\%.