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Day 80: JEE Mains Physics

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

  1. Question 1

    Ray Optics. This type asked 3 times: 2021 Paper 24, 31 Jan 2023, 12 Apr 2023. This one: 12 Apr 2023 See all 3 of this type

    1
    An ice cube has a bubble inside. When viewed from one side the apparent distance of the bubble is 12 cm12\text{ }cm. when viewed from the opposite side, the apparent distance of the bubble is observed as 4 cm4\text{ }cm. If the side of the ice cube is 24 cm24\text{ }cm, the refractive index of the ice cube is

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  2. Question 2

    Semiconductor Electronics. This type asked 3 times: 2021 Paper 1, 27 Jul 2022, 12 Apr 2023. This one: 12 Apr 2023 See all 3 of this type

    4
    In an n−p−nn - p - n common emitter (CE) transistor the collector current changes from 5 mA5\text{ }mA to 16 mA16\text{ }mA for the change in base current from 100μA100\mu A and 200μA200\mu A, respectively. The current gain of transistor is____

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  3. Question 3

    Thermodynamics. This type asked 3 times: 26 Jun 2022, 25 Jul 2022, 12 Apr 2023. This one: 12 Apr 2023 See all 3 of this type

    12
    An engine operating between the boiling and freezing points of water will have (A) efficiency more than 27%27\% (B) efficiency less than the efficiency a Carnot engine operating between the same two temperatures. (C) efficiency equal to 27%27\% (D) efficiency less than 27%27\%

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  4. Question 4

    Electromagnetic Induction. This type asked 3 times: 31 Jan 2023, 10 Apr 2023, 11 Apr 2023. This one: 11 Apr 2023 See all 3 of this type

    109
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A bar magnet dropped through a metallic cylindrical pipe takes more time to come down compared to a non-magnetic bar with same geometry and mass. Reason R: For the magnetic bar, Eddy currents are produced in the metallic pipe which oppose the motion of the magnetic bar. In the light of the above statements, choose the correct answer from the options given below

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  5. Question 5

    Electromagnetic Induction. This type asked 3 times: 25 Jan 2023, 8 Apr 2023, 11 Apr 2023. This one: 11 Apr 2023 See all 3 of this type

    117
    A metallic cube of side 15 cm15\text{ }cm moving along y−y - axis at a uniform velocity of 2 ms−12{\text{ }ms}^{- 1}. In a region of uniform magnetic field of magnitude 0.5 T0.5\text{ }T directed along z-axis. In equilibrium the potential difference between the faces of higher and lower potential developed because of the motion through the field will be____ mVmV.