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Day 519: JEE Mains Physics

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

  1. Question 1

    Motion in a Plane. Asked once: 29 Jan 2024

    22
    A ball rolls off the top of a stairway with horizontal velocity uu. The steps are 0.1 m0.1\text{ }m high and 0.1 m0.1\text{ }m wide. The minimum velocity uu with which that ball just hits the step 5 of the stairway will be xms−1\sqrt{x}ms^{- 1} where x=x = _____ [use g=10 m/s2g = 10\text{ }m/s^{2} ].

  2. Question 2

    Motion in a Straight Line. Asked once: 13 Apr 2023

    5
    Two trains ' AA ' and ' BB ' of length ' ll ' and ' 4l4l ' are travelling into a tunnel of length ' LL ' in parallel tracks from opposite directions with velocities 108 km/h108\text{ }km/h and 72 km/h72\text{ }km/h, respectively. If train ' AA ' takes 35 s35\text{ }s less time than train ' BB ' to cross the tunnel then, length ' LL ' of tunnel is : (Given L=60lL = 60l )

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  3. Question 3

    Moving Charges and Magnetism. Asked once: 29 Jan 2023

    8
    A single current carrying loop of wire carrying current I flowing in anticlockwise direction seen from +ve zz direction and lying in xyxy plane is shown in figure. The plot of ȷ^\widehat{\jmath} component of magnetic field (By) at a distance ' aa ' (less than radius of the coil) and on yzyz plane vs zz coordinate looks like

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  4. Question 4

    Nuclei. Asked once: 28 Jun 2022

    15
    The Q-value of a nuclear reaction and kinetic energy of the projectile particle, KpK_{p} are related as :

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  5. Question 5

    Oscillations. Asked once: 28 Jul 2022

    115
    The potential energy of a particle of mass 4 kg4\text{ }kg in motion along the xx-axis is given by U=4(1−cos⁡4x)JU = 4(1 - \cos4x)J. The time period of the particle for small oscillation (sin⁡θ≃θ)(\sin\theta \simeq \theta) is (πK)\left( \frac{\pi}{K} \right) s. The value of KK is .....