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Day 50: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. This type asked 4 times: 2021 Paper 2, 2021 Paper 9, 28 Jul 2022, 31 Jan 2024. This one: 31 Jan 2024 See all 4 of this type

    93
    The measured value of the length of a simple pendulum is 20 cm20\text{ }cm with 2 mm2\text{ }mm accuracy. The time for 50 oscillations was measured to be 40 seconds with 1 second resolution. From these measurements, the accuracy in the measurement of acceleration due to gravity is N%N\%. The value of NN is:

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  2. Question 2

    Alternating Current. This type asked 4 times: 28 Jul 2022, 6 Apr 2023, 27 Jan 2024, 30 Jan 2024. This one: 30 Jan 2024 See all 4 of this type

    11
    Primary coil of a transformer is connected to 220 V220\text{ }V ac. Primary and secondary turns of the transforms are 100 and 10 respectively. Secondary coil of transformer is connected to two series resistance shown in shown in figure. The output voltage (V0)\left( V_{0} \right) is:

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  3. Question 3

    Wave Optics. This type asked 4 times: 2021 Paper 19, 29 Jul 2022, 1 Feb 2023, 30 Jan 2024. This one: 30 Jan 2024 See all 4 of this type

    101
    A beam of unpolarised light of intensity I0I_{0} is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45∘45^{\circ} relative to that of AA. The intensity of emergent light is:

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  4. Question 4

    Electromagnetic Induction. This type asked 4 times: 24 Jan 2023, 11 Apr 2023, 27 Jan 2024, 29 Jan 2024. This one: 29 Jan 2024 See all 4 of this type

    23
    A square loop of side 10 cm10\text{ }cm and resistance 0.7Ω0.7\Omega is placed vertically in east-west plane. A uniform magnetic field of 0.20 T0.20\text{ }T is set up across the plane in north east direction. The magnetic field is decreased to zero in 1 s1\text{ }s at a steady rate. Then, magnitude of induced emf is x×10−3 V\sqrt{x}\times10^{- 3}\text{ }V. The value of xx is _____ .

  5. Question 5

    Gravitation. This type asked 4 times: 1 Feb 2023, 6 Apr 2023, 11 Apr 2023, 13 Apr 2023. This one: 13 Apr 2023 See all 4 of this type

    102
    Two planets AA and BB of radii RR and 1.5R1.5R have densities ρ\rho and ρ/2\rho/2 respectively. The ratio of acceleration due to gravity at the surface of BB to AA is:

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