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Day 203: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. Asked once: 24 Jan 2025 (same type asked 3 times) See all 3 of this type

    96
    A tightly wound long solenoid carries a current of 1.5 A. An electron is executing uniform circular motion inside the solenoid with a time period of 75 ns. The number of turns per metre in the solenoid is _______\_\_\_\_\_\_\_ . [Take mass of electron m0=9×10−31 kgm_{0}= 9 \times10^{- 31}\text{ }kg, charge of electron ∣q0∣=1.6×10−19C\left| q_{0} \right|= 1.6 \times10^{- 19}C,  μ0=4π×10−7 N A2,1 ns=10−9 s]\left. \ \mu_{0}= 4\pi\times10^{- 7}\frac{\text{ }N}{{\text{ }A}^{2}},1\text{ }ns =10^{- 9}\text{ }s \right\rbrack

  2. Question 2

    Semiconductor Electronics. Asked once: 25 Jan 2023 (same type asked 3 times) See all 3 of this type

    107
    Statement I: When a Si sample is doped with Boron, it becomes PP type and when doped by Arsenic it becomes NN-type semi conductor such that PP-type has excess holes and NN-type has excess electrons. Statement II: When such P-type and N-type semi-conductors, are fused to make a junction, a current will automatically flow which can be detected with an externally connected ammeter. In the light of above statements, choose the most appropriate answer from the options given below

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  3. Question 3

    Thermal Properties of Matter. Asked once: 25 Jun 2022 (same type asked 3 times) See all 3 of this type

    94
    A solid metallic cube having total surface area 24 m2m^{2} is uniformly heated. If its temperature is increased by 10∘C10^{\circ}C, calculate the increase in volume of the cube ( Given: α=5.0×10−4 ∘C−1\alpha = 5.0 \times10^{- 4}\ ^{\circ}C^{- 1} )

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  4. Question 4

    Electrostatics. Asked once: 6 Apr 2023 (same type asked 3 times) See all 3 of this type

    13
    For a uniformly charged thin spherical shell, the electric potential (V)(V) radially away from the center (O) of shell can be graphically represented as

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  5. Question 5

    Mechanical Properties of Fluids. Asked once: 28 Jul 2022 (same type asked 3 times) See all 3 of this type

    97
    Consider a cylindrical tank of radius 1 m1\text{ }m is filled with water. The top surface of water is at 15 m15\text{ }m from the bottom of the cylinder. There is a hole on the wall of cylinder at a height of 5 m5\text{ }m from the bottom. A force of 5×105 N5 \times10^{5}\text{ }N is applied on the top surface of water using a piston. The speed of efflux from the hole will be: (given atmospheric pressure PA=1.01×105 PaP_{A}= 1.01 \times10^{5}\text{ }Pa, density of water ρw=1000 kg/m3\rho_{w}= 1000\text{ }kg/m^{3} and gravitational acceleration g=10 m/s2g= 10\text{ }m/s^{2} )

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