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Day 165: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 12 Apr 2023 (same type asked 5 times) See all 5 of this type

    30
    64 identical drops each charged upto potential of 10mV10mV are combined to form a bigger drop. The potential of the bigger drop will be___ mVmV.

  2. Question 2

    Mechanical Properties of Fluids. Asked once: 21 Jan 2026 S2 (same type asked 5 times) See all 5 of this type

    13
    Surface tension of two liquids (having same densities), T1T_{1} and T2T_{2}, are measured using capillary rise method utilizing two tubes with inner radii of r1r_{1} and r2r_{2} where r1>r2r_{1}>r_{2}. The measured liquid heights in these tubes are h1h_{1} and h2h_{2} respectively. [Ignore the weight of the liquid about the lowest point of miniscus]. The heights h1h_{1} and h2h_{2} and surface tensions T1T_{1} and T2T_{2} satisfy the relation :

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  3. Question 3

    Wave Optics. Asked once: 3 Apr 2025 (same type asked 5 times) See all 5 of this type

    84
    A monochromatic light of frequency 5×1014 Hz5 \times10^{14}\text{ }Hz travelling through air, is incident on a medium of refractive index ' 2 '. Wavelength of the refracted light will be :

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  4. Question 4

    System of Particles and Rotational Motion. Asked once: 2 Apr 2025 (same type asked 5 times) See all 5 of this type

    78
    The moment of inertia of a circular ring of mass MM and diameter r about a tangential axis lying in the plane of the ring is :

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  5. Question 5

    Thermal Properties of Matter. Asked once: 7 Apr 2025 (same type asked 5 times) See all 5 of this type

    98
    Two cylindrical rods AA and BB made of different materials, are joined in a straight line. The ratio of lengths, radii and thermal conductivities of these rods are : LALB=12,rArB=2\frac{L_{A}}{L_{B}} = \frac{1}{2},\frac{r_{A}}{r_{B}} = 2 and KAKB=12\frac{K_{A}}{K_{B}} = \frac{1}{2}. The free ends of rods A and B are maintained at 400 K,200 K400\text{ }K,200\text{ }K, respectively. The temperature of rods interface is ____\_\_\_\_ K, when equilibrium is established.