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Day 28: JEE Mains Physics

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

  1. Question 1

    Mechanical Properties of Solids. This type asked 5 times: 2021 Paper 8, 2021 Paper 22, 27 Jan 2024, 31 Jan 2024, 29 Jan 2025. This one: 29 Jan 2025 See all 5 of this type

    13
    The fractional compression (ΔVV)\left( \frac{\Delta V}{V} \right) of water at the depth of 2.5 km below the sea level is ____\_\_\_\_ %. Given, the Bulk modulus of water =2×109Nm−2= 2 \times10^{9}Nm^{- 2}, density of water =103 kg m−3=10^{3}\text{ }kg{\text{ }m}^{- 3}, acceleration due to gravity =g=10 ms−2= g = 10{\text{ }ms}^{- 2}.

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  2. Question 2

    System of Particles and Rotational Motion. This type asked 5 times: 25 Jun 2022, 29 Jul 2022, 10 Apr 2023, 22 Jan 2025, 29 Jan 2025. This one: 29 Jan 2025 See all 5 of this type

    21
    The coordinates of a particle with respect to origin in a given reference frame is (1,1,1)(1,1,1) meters. If a force of F→=i^−j^+k^\overrightarrow{F}=\widehat{i}-\widehat{j}+\widehat{k} acts on the particle, then the magnitude of torque (with respect to origin) in zz-direction is _____\_\_\_\_\_

  3. Question 3

    System of Particles and Rotational Motion. This type asked 5 times: 1 Feb 2023, 29 Jan 2024, 9 Apr 2024, 23 Jan 2025, 24 Jan 2025. This one: 24 Jan 2025 See all 5 of this type

    11
    A uniform solid cylinder of mass ' m ' and radius ' r ' rolls along an inclined rough plane of inclination 45∘45^{\circ}. If it starts to roll from rest from the top of the plane then the linear acceleration of the cylinder axis will be :-

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  4. Question 4

    Nuclei. This type asked 5 times: 2021 Paper 3, 14 Jun 2022, 29 Jul 2022, 29 Jan 2023, 23 Jan 2025. This one: 23 Jan 2025 See all 5 of this type

    6
    A radioactive nucleus n2n_{2} has 3 times the decay constant as compared to the decay constant of another radioactive nucleus n1n_{1}. If initial number of both nuclei are the same, what is the ratio of number of nuclei of n2n_{2} to the number of nuclei of n1n_{1}, after one half-life of n1n_{1} ?

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  5. Question 5

    Thermodynamics. This type asked 5 times: 2021 Paper 11, 29 Jul 2022, 31 Jan 2023, 29 Jan 2024, 23 Jan 2025. This one: 23 Jan 2025 See all 5 of this type

    93
    Using the given P-V diagram, the work done by an ideal gas along the path ABCD is-

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