PYQ Vault

Day 484: JEE Mains Physics

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

  1. Question 1

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

    17
    Two small balls with masses m and 2 m are attached to both ends of a rigid rod of length d and negligible mass. If angular momentum of this system is L about an axis (A) passing through its centre of mass and perpendicular to the rod then angular velocity of the system about A is :

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  2. Question 2

    Thermal Properties of Matter. Asked once: 25 Jul 2022

    24
    A unit scale is to be prepared whose length does not change with temperature and remains 20 cm20\text{ }cm, using a bimetallic strip made of brass and iron each of different length. The length of both components would change in such a way that difference between their lengths remains constant. If the length of brass is 40 cm40\text{ }cm, the length of iron will be ____\_\_\_\_ cmcm. (αiron=1.2×10−5 K−1\alpha_{\text{iron}}= 1.2 \times10^{- 5}{\text{ }K}^{- 1} and αbrass=1.8×10−5 K−1\alpha_{\text{brass}}= 1.8 \times10^{- 5}{\text{ }K}^{- 1}).
  3. Question 3

    Thermodynamics. Asked once: 29 Jan 2025

    77
    Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : With the increase in the pressure of an ideal gas, the volume falls off more rapidly in an isothermal process in comparison to the adiabatic process. Reason (R) : In isothermal process, PV=PV = constant, while in adiabatic process PVγ=PV^{\gamma}= constant. Here γ\gamma is the ratio of specific heats, P is the pressure and V is the volume of the ideal gas. In the light of the above statements, choose the correct answer from the options given below :

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  4. Question 4

    Units and Measurements. Asked once: 28 Jan 2025

    23
    In a measurement, it is asked to find modulus of elasticity per unit torque applied on the system. The measured quantity has dimension of [Ma Lb Tc]\left\lbrack M^{a}{\text{ }L}^{b}{\text{ }T}^{c} \right\rbrack. If b=−3b= -3, the value of cc is _____\_\_\_\_\_
  5. Question 5

    Wave Optics. Asked once: 27 Jul 2022

    16
    A microscope was initially placed in air (refractive index 1). It is then immersed in oil (refractive index 2). For a light whose wavelength in air is λ\lambda, calculate the change of microscope's resolving power due to oil and choose the correct option

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