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Day 373: JEE Mains Physics

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

  1. Question 1

    Ray Optics. Asked once: 29 Jan 2024 (same type asked 9 times) See all 9 of this type

    15
    A biconvex lens of refractive index 1.5 has a focal length of 20 cm20\text{ }cm in air. Its focal length when immersed in a liquid of refractive index 1.6 will be:

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  2. Question 2

    Electrostatics. Asked once: 6 Apr 2023 (same type asked 9 times) See all 9 of this type

    30
    A parallel plate capacitor with plate area AA and plate separation dd is filled with a dielectric material of dielectric constant K=4K = 4. The thickness of the dielectric material is xx, where x<dx < d. Let C1C_{1} and C2C_{2} be the capacitance of the system for x=13 dx =\frac{1}{3}\text{ }d and x=2 d3x =\frac{2\text{ }d}{3}, respectively. If C1=2μFC_{1}= 2\mu F the value of C2C_{2} is___ μF\mu F

  3. Question 3

    Kinetic Theory. Asked once: 12 Apr 2023 (same type asked 9 times) See all 9 of this type

    5
    If the r.m.s. speed of chlorine molecule is 490 m/s490\text{ }m/s at 27∘C27^{\circ}C, the r.m.s. speed of argon molecules at the same temperature will be (Atomic mass of argon =39.9u= 39.9u, molecular mass of chlorine =70.9u)= 70.9u)

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  4. Question 4

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

    102
    Let γ1\gamma_{1} be the ratio of molar specific heat at constant pressure and molar specific heat at constant volume of a monoatomic gas and γ2\gamma_{2} be the similar ratio of diatomic gas. Considering the diatomic gas molecule as a rigid rotator, the ratio, γ1γ2\frac{\gamma_{1}}{\gamma_{2}} is:

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  5. Question 5

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

    118
    If a copper wire is stretched to increase its length by 20%20\%. The percentage increase in resistance of the wire is ____\_\_\_\_ %\%.