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Day 270: JEE Mains Physics

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

  1. Question 1

    Laws of Motion. Asked once: 2021 Paper 24 (same type asked 5 times) See all 5 of this type

    24
    When a body slides down from rest along a smooth inclined plane making an angle of 30∘30^{\circ} with the horizontal, it takes time T. When the same body slides down from the rest along a rough inclined plane making the same angle and through the same distance, it takes time αT\alpha T, where α\alpha is a constant greater than 1. The co-efficient of friction between the body and the rough plane is 1x(α2−1α2)\frac{1}{\sqrt{x}}\left( \frac{\alpha^{2}- 1}{\alpha^{2}} \right) where x=x =

  2. Question 2

    Mechanical Properties of Solids. Asked once: 2021 Paper 19 (same type asked 5 times) See all 5 of this type

    20
    Two blocks of masses 3 kg3\text{ }kg and 5 kg5\text{ }kg are connected by a metal wire going over a smooth pulley. The breaking stress of the metal is 24π×102Nm−2\frac{24}{\pi}\times10^{2}Nm^{- 2}. What is the minimum radius of the wire? (Take g=10 ms−2g = 10{\text{ }ms}^{- 2} )

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  3. Question 3

    Electromagnetic Induction. Asked once: 25 Jul 2022 (same type asked 5 times) See all 5 of this type

    120
    Magnetic flux (in weber) in a closed circuit of resistance 20Ω20\Omega varies with time t(s)t\left( s \right) as ϕ=8t2−9t+5\phi= 8t^{2}- 9t+ 5. The magnitude of the induced current at t=0.25 st = 0.25\text{ }s will be ____\_\_\_\_ mA.

  4. Question 4

    Motion in a Straight Line. Asked once: 23 Jan 2025 (same type asked 5 times) See all 5 of this type

    19
    The motion of an airplane is represented by velocity-time graph as shown below. The distance covered by airplane in the first 30.5 second is _____\_\_\_\_\_ km.

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  5. Question 5

    Nuclei. Asked once: 8 Apr 2024 (same type asked 5 times) See all 5 of this type

    109
    If MoM_{o} is the mass of isotope  512B,Mp\ _{5}^{12}B,M_{p} and MnM_{n} are the masses of proton and neutron, then nuclear binding energy of isotope is:

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