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Day 172: JEE Mains Physics

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

  1. Question 1

    Oscillations. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    24
    In the figure given below, a block of mass M=490 gM = 490\text{ }g placed on a frictionless table is connected with two springs having same spring constant (K=2 N m−1)\left( K = 2\text{ }N{\text{ }m}^{- 1} \right). If the block is horizontally displaced through ' XX ' mm then the number of complete oscillations it will make in 14π14\pi seconds will be___

  2. Question 2

    Alternating Current. Asked once: 29 Jul 2022 (same type asked 5 times) See all 5 of this type

    13
    An alternating emf E=440sin⁡100πtE = 440\sin100\pi t is applied to a circuit containing an inductance of 2πH\frac{\sqrt{2}}{\pi}H. If an a.c. ammeter is connected in the circuit, its reading will be:

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  3. Question 3

    Moving Charges and Magnetism. Asked once: 29 Jul 2022 (same type asked 5 times) See all 5 of this type

    26
    A closely wounded circular coil of radius 5 cm5\text{ }cm produces a magnetic field of 37.68×10−4 T37.68 \times10^{- 4}\text{ }T at its center. The current through the coil is ______A. [Given, number of turns in the coil is 100 and π=3.14]\pi = 3.14\rbrack

  4. Question 4

    Waves. Asked once: 29 Jan 2023 (same type asked 5 times) See all 5 of this type

    23
    Two simple harmonic waves having equal amplitudes of 8 cm8\text{ }cm and equal frequency of 10 Hz10\text{ }Hz are moving along the same direction. The resultant amplitude is also 8 cm8\text{ }cm. The phase difference between the individual waves is_____ degree.

  5. Question 5

    Ray Optics. Asked once: 24 Jan 2025 (same type asked 4 times) See all 4 of this type

    12
    A thin plano convex lens made of glass of refractive index 1.5 is immersed in a liquid of refractive index 1.2. When the plane side of the lens is silver coated for complete reflection, the lens immersed in the liquid behaves like a concave mirror of focal length 0.2 m . The radius of curvature of the curved surface of the lens is :-

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