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Day 489: JEE Mains Physics

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

  1. Question 1

    Ray Optics. Asked once: 4 Apr 2025

    94
    A finite size object is placed normal to the principal axis at a distance of 30 cm from a convex mirror of focal length 30 cm . A plane mirror is now placed in such a way that the image produced by both the mirrors coincide with each other. The distance between the two mirrors is:

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  2. Question 2

    Semiconductor Electronics. Asked once: 28 Jan 2026 S1

    10
    Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode D1D_{1} in the circuit is ____\_\_\_\_ mA . (Assume all diodes in the given circuit are identical)

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  3. Question 3

    System of Particles and Rotational Motion. Asked once: 23 Jan 2026 S1

    8
    The moment of inertia of a square loop made of four uniform solid cylinders, each having radius R and length L(R<L)L(R < L) about an axis passing through the mid points of opposite sides, is (Take the mass of the entire loop as M ) :

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  4. Question 4

    Thermal Properties of Matter. Asked once: 25 Jun 2022

    24
    A steam engine intake 50 g50\text{ }g of steam at 100∘C100^{\circ}C per minute and cools it down to 20∘C20^{\circ}C. If latent heat of vaporization of steam is 540calg−1540calg^{- 1}, then the heat rejected by the steam engine per minute is ____\_\_\_\_ ×103 cal\times10^{3}\ cal

  5. Question 5

    Thermodynamics. Asked once: 24 Jan 2025

    20
    An ideal gas goes from an initial state to final state. During the process, the pressure of gas increases linearly with temperature. (A) The work done by gas during the process is zero. (B) The heat added to gas is different from change in its internal energy. (C) The volume of the gas is increased. (D) The internal energy of the gas is increased. (E) The process is isochoric (constant volume process) Choose the correct answer from the options given below :-

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