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Day 494: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked once: 29 Jan 2024

    19
    The explosive in a Hydrogen bomb is a mixture of  1H2, 1H3\ _{1}H^{2},\ _{1}H^{3} and  3Li6\ _{3}Li^{6} in some condensed form. The chain reaction is given by
     3Li6+ 0n1→ 2He4+ 1H3\ _{3}Li^{6}+\ _{0}n^{1}\rightarrow\ _{2}He^{4}+\ _{1}H^{3}
     1H2+ 1H3→He4+ 0n1\ _{1}H^{2}+\ _{1}H^{3}\rightarrow He^{4}+\ _{0}n^{1}
    During the explosion the energy released is approximately [Given: M(Li)=6.01690amu.M( 1H2)=2.01471M(Li) = 6.01690amu.M\left( \ _{1}H^{2} \right)= 2.01471 amu. M( 2He4)=4.00388amuM\left( \ _{2}He^{4} \right)= 4.00388amu, and 1amu=931.51amu = 931.5
    MeV]MeV\rbrack

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  2. Question 2

    Oscillations. Asked once: 31 Jan 2024

    119
    The time period of simple harmonic motion of mass MM in the given figure is παM5K\pi\sqrt{\frac{\alpha M}{5K}}, where the value of α\alpha is ______ .

  3. Question 3

    Ray Optics. Asked once: 2 Apr 2025

    4
    A slanted object ABAB is placed on one side of convex lens as shown in the diagram. The image is formed on the opposite side. Angle made by the image with principal axis is:

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  4. Question 4

    Semiconductor Electronics. Asked once: 24 Jan 2026 S2

    14
    Identify the correct truth table of the given logical circuit.

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 22 Jan 2026 S2

    4
    A uniform bar of length 12 cm and mass 20m20m lies on a smooth horizontal table. Two point masses m and 2m2m are moving in opposite directions with same speed of v and in the same plane as the bar, as shown in figure. These masses strike the bar simultaneously and get stuck to it. After collision the entire system is rotating with angular frequency ω\omega. The ratio of v and ω\omega is :

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