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Day 446: JEE Mains Physics

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

  1. Question 1

    Semiconductor Electronics. Asked once: 6 Apr 2026 S1

    14
    The maximum rated power of the LED is 2 mW and it is used in the circuit with input voltage of 5 V as shown in the figure below. The current through resistance RSR_{S} is 0.5 mA . The minimum value of the resistance of RsR_{s}, to ensure that the LED is not damaged is ____\_\_\_\_ kΩk\Omega.

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  2. Question 2

    System of Particles and Rotational Motion. Asked once: 6 Apr 2026 S1

    8
    The position of center of mass of three masses 2 kg,3 kg2\text{ }kg,3\text{ }kg and 15 kg placed with respect to mid point (p) of normal bisector, as shown in the figure is ____\_\_\_\_.

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  3. Question 3

    Thermal Properties of Matter. Asked once: 2 Apr 2025

    94
    Match List-I with List-II.
    List-IList-II
    (A) Heat capacity of body(I) Jkg−1J{kg}^{-1}
    (B) Specific heat capacity of body(II) JK−1{JK}^{-1}
    (C) Latent heat(III) Jkg−1K−1J{kg}^{-1}K^{-1}
    (D) Thermal conductivity(IV) Jm−1K−1s−1{Jm}^{-1}K^{-1}s^{-1}
    Choose the correct answer from the options given below :

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  4. Question 4

    Thermodynamics. Asked once: 4 Apr 2026 S1

    11
    An ideal gas undergoes a process maintaining relation between pressure ( P ) and volume ( V ) as P=Po(1+(VoV)2)−1P =P_{o}\left( 1 +\left( \frac{V_{o}}{V} \right)^{2} \right)^{- 1}, where PoP_{o} and VoV_{o} are constants. If two samples A and B (two moles each) with initial volume VoV_{o} and 3 Vo3{\text{ }V}_{o} respectively undergo above mentioned process and attain same pressure, then the difference at the temperatures of these samples, TB−TAT_{B}-T_{A} is ____\_\_\_\_ ( R=R = gas constant)

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  5. Question 5

    Units and Measurements. Asked once: 23 Jan 2026 S2

    10
    To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm . The least count of scale is 1 cm . The percentage error in the ratio of EMFs is ____\_\_\_\_

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