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Day 216: JEE Mains Physics

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

  1. Question 1

    System of Particles and Rotational Motion. Asked once: 29 Jun 2022 (same type asked 3 times) See all 3 of this type

    117
    The moment of inertia of a uniform thin rod about a perpendicular axis passing through one end is I1I_{1}. The same rod is bent into a ring and its moment of inertia about a diameter is I2I_{2}. If I1I2\frac{I_{1}}{I_{2}} is xπ23\frac{x\pi^{2}}{3}, then the value of xx will be

  2. Question 2

    Electromagnetic Waves. Asked once: 1 Feb 2023 (same type asked 3 times) See all 3 of this type

    95
    The ratio of average electric energy density and total average energy density of electromagnetic wave is:

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  3. Question 3

    Motion in a Plane. Asked once: 24 Jan 2023 (same type asked 3 times) See all 3 of this type

    109
    A body of mass 200 g200\text{ }g is tied to a spring of spring constant 12.5 N/m12.5\text{ }N/m, while the other end of spring is fixed at point 0. If the body moves about 0 in a circular path on a smooth horizontal surface with constant angular speed 5rad/s5rad/s. Then the ratio of extension in the spring to its natural length will be:

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  4. Question 4

    Waves. Asked once: 28 Jul 2022 (same type asked 3 times) See all 3 of this type

    27
    The frequency of echo will be ____\_\_\_\_ HzHz if the train blowing a whistle of frequency 320 Hz320\text{ }Hz is moving with a velocity of 36 km/h36\text{ }km/h towards a hill from which an echo is heard by the train driver. Velocity of sound in air is 330 m/s330\text{ }m/s.

  5. Question 5

    Alternating Current. Asked once: 25 Jul 2022 (same type asked 3 times) See all 3 of this type

    100
    When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on

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