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Day 472: JEE Mains Physics

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

  1. Question 1

    Motion in a Straight Line. Asked once: 3 Apr 2025

    89
    A particle moves along the xx-axis and has its displacement xx varying with time tt according to the equation
    x=c0(t2−2)+c(t−2)2x =c_{0}\left( t^{2}- 2 \right)+ c(t - 2)^{2}
    where c0c_{0} and cc are constants of appropriate dimensions. Then, which of the following statements is correct?

    Tap an option to check your answer.

  2. Question 2

    Moving Charges and Magnetism. Asked once: 6 Apr 2024

    116
    In the given figure an ammeter AA consists of a 240Ω240\Omega coil connected in parallel to a 10Ω10\Omega shunt. The reading of the ammeter is ____ mAmA.

  3. Question 3

    Nuclei. Asked once: 9 Apr 2024

    106
    The energy released in the fusion of 2 kg2\text{ }kg of hydrogen deep in the sun is EHE_{H} and the energy released in the fission of 2 kg2\text{ }kg of  235U\ ^{235}U is EUE_{U}. The ratio EHEU\frac{E_{H}}{E_{U}} is approximately: (Consider the fusion reaction as 411H+2e−→ 24He+2v+6γ+26.7MeV4_{1}^{1}H + 2e^{-}\rightarrow\ _{2}^{4}He + 2v + 6\gamma + 26.7MeV, energy released in the fission reaction of  235U\ ^{235}U is 200MeV200MeV per fission nucleus and NA=6.023×1023N_{A}= 6.023 \times10^{23} )

    Tap an option to check your answer.

  4. Question 4

    Oscillations. Asked once: 28 Jan 2025

    87
    Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Knowing initial position x0x_{0} and initial momentum p0p_{0} is enough to determine the position and momentum at any time tt for a simple harmonic motion with a given angular frequency ω\omega. Reason (R) : The amplitude and phase can be expressed in terms of x0x_{0} an p0p_{0}. In the light of the above statements, choose the correct answer from the options given below :

    Tap an option to check your answer.

  5. Question 5

    Ray Optics. Asked once: 21 Jan 2026 S1

    21
    A collimated beam of light of diameter 2 mm is propagating along x -axis. The beam is required to be expanded in a collimated beam of diameter 14 mm using a system of two convex lenses. If first lens has focal length 40 mm , then the focal length of second lens is ____\_\_\_\_ mm .