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Day 520: JEE Mains Physics

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

  1. Question 1

    Ray Optics. Asked once: 24 Jan 2025

    2
    What is the relative decrease in focal length of a lens for an increase in optical power by 0.1 D from 2.5 D ? ['D' stands for dioptre]

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  2. Question 2

    Semiconductor Electronics. Asked once: 21 Jan 2026 S1

    17
    The given circuit works as :

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  3. Question 3

    System of Particles and Rotational Motion. Asked once: 4 Apr 2025

    4
    Which of the following are correct expression for torque acting on a body? A. τ→=r→×L→\overrightarrow{\tau} = \overrightarrow{r} \times \overrightarrow{L} B. τ→=ddt(r→×p→)\overrightarrow{\tau} = \frac{d}{dt}(\overrightarrow{r} \times \overrightarrow{p}) C. τ→=r→×dp→dt\overrightarrow{\tau} = \overrightarrow{r} \times \frac{d\overrightarrow{p}}{dt} D. τ→=Iα→\overrightarrow{\tau} = I\overrightarrow{\alpha} E. τ→=r→×F→\overrightarrow{\tau} = \overrightarrow{r} \times \overrightarrow{F} ( r→=\overrightarrow{r}= position vector; p→=\overrightarrow{p}= linear momentum; L→=\overrightarrow{L}= angular momentum; α→=\overrightarrow{\alpha}= angular acceleration; I=I= moment of inertia; F→=\overrightarrow{F}= force; t=t= time) Choose the correct answer from the options given below:

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  4. Question 4

    Thermal Properties of Matter. Asked once: 2021 Paper 20

    28
    A rodCDrodCD of thermal resistance 10.0KW−110.0KW^{- 1} is joined at the middle of an identical rodABrodAB as shown in figure, The end A,BA,B and DD are maintained at 200∘C, 100∘C200^{\circ}C,\ 100^{\circ}C and 125∘C125^{\circ}C respectively. The heat current in CDCD is PP watt. The value of PP is

  5. Question 5

    Thermodynamics. Asked once: 31 Jan 2024

    8
    The given figure represents two isobaric processes for the same mass of an ideal gas, then

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