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Day 189: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. Asked once: 2021 Paper 2 (same type asked 4 times) See all 4 of this type

    13
    The period of oscillation of a simple pendulum is T=2πLgT= 2\pi\sqrt{\frac{L}{g}}. Measured value of ' LL ' is 1.0 m1.0\text{ }m from meter scale having a minimum division of 1 mm1\text{ }mm and time of one complete oscillation is 1.95 s1.95\text{ }s measured from stopwatch of 0.01 s0.01\text{ }s resolution. The percentage error in the determination of ' gg ' will be:

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  2. Question 2

    Alternating Current. Asked once: 27 Jan 2024 (same type asked 4 times) See all 4 of this type

    102
    Primary side of a transformer is connected to 230 V,50 Hz230\text{ }V,50\text{ }Hz supply. Turns ratio of primary to secondary winding is 10:110:1. Load resistance connected to secondary side is 46Ω46\Omega. The power consumed in it is:

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  3. Question 3

    Wave Optics. Asked once: 1 Feb 2023 (same type asked 4 times) See all 4 of this type

    10
    nn polarizing sheets are arranged such that each makes an angle 45∘45^{\circ} with the preceding sheet. An unpolarized light of intensity I is incident into this arrangement. The output intensity is found to be I/64. The value of nn will be:

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  4. Question 4

    Electromagnetic Induction. Asked once: 27 Jan 2024 (same type asked 4 times) See all 4 of this type

    12
    A rectangular loop of length 2.5 m2.5\text{ }m and width 2 m2\text{ }m is placed at 60∘60^{\circ} to a magnetic field of 4 T4\text{ }T. The loop is removed from the field in 10sec10sec. The average emf induced in the loop during this time is

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  5. Question 5

    Gravitation. Asked once: 11 Apr 2023 (same type asked 4 times) See all 4 of this type

    3
    The radii of two planets ' AA ' and ' BB ' are ' RR ' and ' 4R4R ' and their densities are ρ\rho and ρ/3\rho/3 respectively. The ratio of acceleration due to gravity at their surfaces (gA:gB)\left( g_{A}:g_{B} \right) will be :

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