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Day 114: JEE Mains Physics

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

  1. Question 1

    Waves. This type asked 2 times: 2021 Paper 26, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 2 of this type

    21
    Two tuning forks A and B are sounded together giving rise to 8 beats in 2 s . When fork A is loaded with wax, the beat frequency is reduced to 4 beats in 2 s . If the original frequency of tuning fork B is 380 Hz , then the original frequency of tuning fork A is ____\_\_\_\_ Hz.

  2. Question 2

    Waves. This type asked 2 times: 31 Jan 2023, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 2 of this type

    9
    The speed of a longitudinal wave in a metallic bar is 400 m/s400\text{ }m/s. If the density and Young's modulus of the bar material are increased by 0.5%0.5\% and 1%1\% respectively then the speed of the wave is changed approximately to ____\_\_\_\_ m/sm/s.

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  3. Question 3

    System of Particles and Rotational Motion. This type asked 2 times: 2021 Paper 24, 24 Jan 2026 S2. This one: 24 Jan 2026 S2 See all 2 of this type

    6
    A thin uniform rod (X)(X) of mass M and length L is pivoted at a height (L3)\left( \frac{L}{3} \right) as shown in the figure. The rod is allowed to fall from a vertical position and lie horizontally on the table. The angular velocity of this rod when it hits the table top, is ____\_\_\_\_ . ( g=g = gravitational acceleration)

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  4. Question 4

    Waves. This type asked 2 times: 30 Jan 2024, 24 Jan 2026 S2. This one: 24 Jan 2026 S2 See all 2 of this type

    16
    A point source is kept at the center of a spherically enclosed detector. If the volume of the detector increased by 8 times, the intensity will

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  5. Question 5

    Electrostatics. This type asked 2 times: 29 Jan 2023, 24 Jan 2026 S1. This one: 24 Jan 2026 S1 See all 2 of this type

    15
    The electrostatic potential in a charged spherical region of radius rr varies as V=ar3+bV = ar^{3}+ b, where aa and bb are constants. The total charge in the sphere of unit radius is α×πa∈0\alpha \times \pi a\in_{0}. The value of α\alpha is ____\_\_\_\_ . (permittivity of vacuum is ∈0\in_{0})

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