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Day 556: JEE Mains Physics

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

  1. Question 1

    Ray Optics. Asked once: 8 Apr 2023

    5
    In a reflecting telescope, a secondary mirror is used to:

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  2. Question 2

    Semiconductor Electronics. Asked once: 28 Jan 2025

    90
    In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage VABV_{AB} is correctly represented by :

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  3. Question 3

    System of Particles and Rotational Motion. Asked once: 11 Apr 2023

    112
    A circular plate is rotating in horizontal plane, about an axis passing through its center and perpendicular to the plate, with an angular velocity ω\omega. A person sits at the center having two dumbbells in his hands. When he stretches out his hands, the moment of inertia of the system becomes triple. If EE be the initial Kinetic energy of the system, then final Kinetic energy will be Ex\frac{E}{x}. The value of xx is

  4. Question 4

    Thermodynamics. Asked once: 28 Jun 2022

    98
    A sample of an ideal gas is taken through the cyclic process ABCAABCA as shown in figure. It absorbs, 40 J40\text{ }J of heat during the part ABAB, no heat during BCBC and rejects 60 J60\text{ }J of heat during CACA. A work 50 J50\text{ }J is done on the gas during the part BCBC. The internal energy of the gas at A is 1560J. The work done by the gas during the part CACA is:

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  5. Question 5

    Units and Measurements. Asked once: 29 Jan 2023

    116
    In an experiment of measuring the refractive index of a glass slab using travelling microscope in physics lab, a student measures real thickness of the glass slab as 5.25 mm5.25\text{ }mm and apparent thickness of the glass slab as 5.00 mm5.00\text{ }mm. Travelling microscope has 20 divisions in one cmcm on main scale and 50 divisions on vernier scale is equal to 49 divisions on main scale. The estimated uncertainty in the measurement of refractive index of the slab is x10×10−3\frac{x}{10}\times10^{- 3}, where xx is___