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Day 524: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked once: 28 Jun 2022

    108
    Following statements related to radioactivity are given below: (A) Radioactivity is a random and spontaneous process and is dependent on physical and chemical conditions. (B) The number of un-decayed nuclei in the radioactive sample decays exponentially with time. (C) Slope of the graph of log⁡e\log_{e} (no. of undecayed nuclei) Vs. time represents the reciprocal of mean life time (τ)(\tau). (D) Product of decay constant ( λ\lambda ) and half-life time (T1/2)\left( T_{1/2} \right) is not constant. Choose the most appropriate answer from the options given below:

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  2. Question 2

    Oscillations. Asked once: 26 Jul 2022

    120
    As per given figures, two springs of spring constants KK and 2 K2\text{ }K are connected to mass mm. If the period of oscillation in figure (a) is 3 s3\text{ }s, then the period of oscillation in figure (b) will be xs\sqrt{x}s. The value of xx is

  3. Question 3

    Ray Optics. Asked once: 24 Jan 2025

    89
    A photograph of a landscape is captured by a drone camera at a height of 18 km . The size of the camera film is 2 cm×2 cm2\text{ }cm \times 2\text{ }cm and the area of the landscape photographed is 400 km2400{\text{ }km}^{2}. The focal length of the lens in the drone camera is :

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  4. Question 4

    Semiconductor Electronics. Asked once: 7 Apr 2025

    11
    In the following circuit, the reading of the ammeter will be (Take Zener breakdown voltage =4 V= 4\text{ }V ).

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 4 Apr 2025

    97
    A solid sphere with uniform density and radius RR is rotating initially with constant angular velocity (ω1)\left( \omega_{1} \right) about its diameter. After some time during the rotation its starts loosing mass at a uniform rate, with no change in its shape. The angular velocity of the sphere when its radius become R/2R/2 is xω1x\omega_{1}. The value of xx is .