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Day 389: JEE Mains Physics

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

  1. Question 1

    Mechanical Properties of Fluids. Asked once: 2021 Paper 18 (same type asked 5 times) See all 5 of this type

    5
    Two narrow bores of diameter 5.0 mm5.0\text{ }mm and 8.0 mm8.0\text{ }mm are joined together to form a U-shaped tube open at both ends. If this U-tube contains water, what is the difference in the level of two limbs of the tube. [Take surface tension of water T=7.3×10−2Nm−1T = 7.3 \times10^{- 2}Nm^{- 1}, angle of contact =0, g=10 ms−2= 0,\text{ }g = 10{\text{ }ms}^{- 2} and density of water =1.0×103 kg m−3= 1.0 \times10^{3}\text{ }kg{\text{ }m}^{- 3} ]

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  2. Question 2

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

    19
    The difference of speed of light in the two media AA and B(vA−vB)B\left( v_{A}-v_{B} \right) is 2.6×107 m/s2.6 \times10^{7}\text{ }m/s. If the refractive index of medium BB is 1.47 , then the ratio of refractive index of medium BB to medium A is : (Given : speed of light in vacuum  c=3×108 ms−1)\left. \ c = 3 \times10^{8}{\text{ }ms}^{- 1} \right)

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  3. Question 3

    System of Particles and Rotational Motion. Asked once: 25 Jan 2023 (same type asked 5 times) See all 5 of this type

    117
    If a solid sphere of mass 5 kg5\text{ }kg and a disc of mass 4 kg4\text{ }kg have the same radius. Then the ratio of moment of inertia of the disc about a tangent in its plane to the moment of inertia of the sphere about its tangent will be x7\frac{x}{7}. The value of xx is

  4. Question 4

    Thermal Properties of Matter. Asked once: 2021 Paper 25 (same type asked 5 times) See all 5 of this type

    2
    The temperature θ\theta at the junction of two insulating sheets, having thermal resistances R1R_{1} and R2R_{2} as well as top and bottom temperatures θ1\theta_{1} and θ2\theta_{2} (as shown in figure) is given by:

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  5. Question 5

    Electrostatics. Asked once: 28 Jul 2022 (same type asked 5 times) See all 5 of this type

    26
    Two electric dipoles of dipole moments 1.2×10−30 cm1.2 \times10^{- 30}\text{ }cm and 2.4×10−30 cm2.4 \times10^{- 30}\text{ }cm are placed in two different uniform electric fields of strengths 5×104NC−15 \times10^{4}NC^{- 1} and 15×104NC−115 \times10^{4}NC^{- 1} respectively. The ratio of maximum torque experienced by the electric dipoles will be 1x\frac{1}{x}. The value of xx is