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Day 479: JEE Mains Physics

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

  1. Question 1

    Thermodynamics. Asked once: 29 Jan 2025

    81
    A poly-atomic molecule (CV=3R,Cp=4R\left( C_{V}= 3R,C_{p}= 4R \right., where RR is gas constant) goes from phase space point A(PA=105 Pa, VA=4×10−6 m3)A\left( P_{A}=10^{5}\text{ }Pa,{\text{ }V}_{A}= 4 \times10^{- 6}{\text{ }m}^{3} \right) to point B(PB=5B\left( P_{B}= 5 \right.  ×104 Pa, VB=6×10−6 m3)\left. \ \times10^{4}\text{ }Pa,{\text{ }V}_{B}= 6 \times10^{- 6}{\text{ }m}^{3} \right) to point C(PC=104 PaC\left( P_{C}=10^{4}\text{ }Pa \right., VC=8×10−6 m3V_{C}= 8 \times10^{- 6}{\text{ }m}^{3} ). A to B is an adiabatic path and B to C is an isothermal path. The net heat absorbed per unit mole by the system is :

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  2. Question 2

    Units and Measurements. Asked once: 2 Apr 2025

    82
    Given a charge qq, current II and permeability of vacuum μ0\mu_{0}. Which of the following quantity has the dimension of momentum?

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  3. Question 3

    Wave Optics. Asked once: 24 Jan 2023

    6
    Given below are two statements: Statement I: If the Brewster's angle for the light propagating from air to glass is θB\theta_{B}, then the Brewster's angle for the light propagating from glass to air is π2−θB\frac{\pi}{2}-\theta_{B} Statement II: The Brewster's angle for the light propagating from glass to air is tan⁡−1(μg)\tan^{- 1}\left( \mu_{g} \right) where μg\mu_{g} is the refractive index of glass. In the light of the above statements, choose the correct answer from the options given below:

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  4. Question 4

    Waves. Asked once: 8 Apr 2023

    17
    The engine of a train moving with speed 10 ms−110{\text{ }ms}^{- 1} towards a platform sounds a whistle at frequency 400 Hz400\text{ }Hz. The frequency heard by a passenger inside the train is (neglect air speed. Speed of sound in air 330 ms−1330{\text{ }ms}^{- 1} )

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  5. Question 5

    Work, Energy and Power. Asked once: 29 Jan 2025

    86
    Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) Three identical spheres of same mass undergo one dimensional motion as shown in figure with initial velocities vA=5 m/s,vB=2 m/s,vc=4 m/sv_{A}= 5\text{ }m/s,v_{B}= 2\text{ }m/s,v_{c}= 4\text{ }m/s If we wait sufficiently long for elastic collision to happen, then vA=4 m/s,vB=2 m/s,vc=5 m/sv_{A}= 4\text{ }m/s,v_{B}= 2\text{ }m/s,v_{c}= 5\text{ }m/s will be the final velocities. Reason (R) : In an elastic collision between identical masses, two objects exchange their velocities. In the light of the above statements, choose the correct answer from the options given below :

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