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Day 532: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked once: 2021 Paper 22

    6
    A sample of a radioactive nucleus A disintegrates to another radioactive nucleus BB, which in turn disintegrates to some other stable nucleus C. Plot of a graph showing the variation of number of atoms of nucleus BB vesus time is : (Assume that at t=0t = 0, there are no BB atoms in the sample)

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  2. Question 2

    Oscillations. Asked once: 2021 Paper 26

    30
    Time period of a simple pendulum is TT. The time taken to complete 58\frac{5}{8} oscillations starting from mean position is αβT\frac{\alpha}{\beta}T. The value of α\alpha is

  3. Question 3

    Ray Optics. Asked once: 22 Jan 2025

    8
    In the diagram given below, there are three lenses formed. Considering negligible thickness of each of them as compared to ∣R1∣\left| R_{1} \right| and ∣R2∣\left| R_{2} \right|, i.e., the radii of curvature for upper and lower surfaces of the glass lens, the power of the combination is

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  4. Question 4

    Semiconductor Electronics. Asked once: 4 Apr 2025

    15
    The Boolean expression Y=ABˉC+AˉCˉY=A\bar{B}C+\bar{A}\bar{C} can be realised with which of the following gate configurations. A. One 3-input AND gate, 3 NOT gates and one 2input OR gate, One 2-input AND gate, B. One 3-input AND gate, 1 NOT gate, One 2-input NOR gate and one 2-input OR gate C. 3-input OR gate, 3 NOT gates and one 2-input AND gate Choose the correct answer from the options given below

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 29 Jan 2025

    90
    Three equal masses mm are kept at vertices (A, B, C) of an equilateral triangle of side aa in free space. At t=0t = 0, they are given an initial velocity V→A=V0AC→, V→B=V0BA→{\overrightarrow{V}}_{A}=V_{0}\overrightarrow{AC},\ {\overrightarrow{V}}_{B}=V_{0}\overrightarrow{BA} and  V→C=V0CB→\ {\overrightarrow{V}}_{C}=V_{0}\overrightarrow{CB}. Here, AC→,CB→\overrightarrow{AC},\overrightarrow{CB} and BA→\overrightarrow{BA} are unit vectors along the edges of the triangle. If the three masses interact gravitationally, then the magnitude of the net angular momentum of the system at the point of collision is :

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