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Day 116: JEE Mains Physics

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

  1. Question 1

    Nuclei. This type asked 2 times: 24 Jan 2023, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 2 of this type

    21
    The average energy released per fission for the nucleus of  92235U\ _{92}^{235}U is 190 MeV. When all the atoms of 47 g pure  92235U\ _{92}^{235}U undergo fission process, the energy released is α×1023MeV\alpha \times 10^{23}MeV. The value of α\alpha is ____\_\_\_\_ . (Avogadro Number =6×1023= 6 \times 10^{23} per mole)

  2. Question 2

    Electromagnetic Induction. This type asked 2 times: 29 Jan 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 2 of this type

    16
    A 20 m long uniform copper wire held horizontally is allowed to fall under the gravity ( g=10 m/s2g = 10\text{ }m/s^{2} ) through a uniform horizontal magnetic field of 0.5 Gauss perpendicular to the length of the wire. The induced EMF across the wire after it travels a vertical distance of 200 m is ____\_\_\_\_ mV .

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  3. Question 3

    Units and Measurements. This type asked 2 times: 28 Jun 2022, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 2 of this type

    4
    Four persons measure the length of a rod as 20.00 cm,19.75 cm,17.01 cm20.00\text{ }cm,19.75\text{ }cm,17.01\text{ }cm and 18.25 cm . The relative error in the measurement of average length of the rod is :

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  4. Question 4

    Oscillations. This type asked 2 times: 1 Feb 2023, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 2 of this type

    2
    Using a simple pendulum experiment g is determined by measuring its time period T. Which of the following plots represent the correct relation between the pendulum length L and time period T?

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  5. Question 5

    Ray Optics. This type asked 2 times: 21 Jan 2026 S2, 22 Jan 2026 S1. This one: 22 Jan 2026 S1 See all 2 of this type

    15
    Consider an equilateral prism (refractive index 2\sqrt{2} ). A ray of light is incident on its one surface at a certain angle ii. If the emergent ray is found to graze along the other surface then the angle of refraction at the incident surface is close to ____\_\_\_\_ .

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