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Day 64: JEE Mains Physics

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

  1. Question 1

    Work, Energy and Power. This type asked 3 times: 30 Jan 2023, 29 Jan 2025, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 3 of this type

    2
    A small bob A of mass m is attached to a massless rigid rod of length 1 m pivoted at point P and kept at an angle of 60∘60^{\circ} with vertical as shown in figure. At distance of 1 m below point P, an identical bob B is kept at rest on a smooth horizontal surface that extends to a circular track of radius R as shown in figure. If bob B just manages to complete the circular path of radius R upto a point Q after being hit elastically by bob A, then radius R is ____\_\_\_\_ m.

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  2. Question 2

    Work, Energy and Power. This type asked 3 times: 28 Jun 2022, 10 Apr 2023, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 3 of this type

    18
    In a perfectly inelastic collision, two spheres made of the same material with masses 15 kg and 25 kg , moving in opposite directions with speeds of 10 m/s10\text{ }m/s and 30 m/s30\text{ }m/s, respectively, strike each other and stick together. The rise in temperature (in  ∘C\ ^{\circ}C), if all the heat produced during the collision is retained by these spheres, is : (specific heat of sphere material 31cal/kg. ∘C31cal/kg.\ ^{\circ}C and 1cal=4.2 J1cal = 4.2\text{ }J)

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  3. Question 3

    Atoms. This type asked 3 times: 10 Apr 2023, 5 Apr 2024, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 3 of this type

    7
    The smallest wavelength of Lyman series is 91 nm. The difference between the largest wavelengths of Paschen and Balmer series is nearly ____\_\_\_\_ nm.

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  4. Question 4

    Current Electricity. This type asked 3 times: 2021 Paper 2, 24 Jan 2023, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 3 of this type

    13
    Figure shows the circuit that contains three resistances (9Ω9\Omega each) and two inductors (4 mH each). The reading of ammeter at the moment switch KK is turned ON , is ____\_\_\_\_ A.

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  5. Question 5

    Electromagnetic Waves. This type asked 3 times: 2021 Paper 13, 29 Jun 2022, 22 Jan 2026 S2. This one: 22 Jan 2026 S2 See all 3 of this type

    18
    A laser beam has intensity of 4.0×1014 W/m24.0 \times 10^{14}\text{ }W/m^{2}. The amplitude of magnetic field associated with beam is ____\_\_\_\_ T. (Take ϵ0=8.85×10−12C2/Nm2\epsilon_{0} = 8.85 \times 10^{- 12}C^{2}/Nm^{2} and c=3×108 m/sc = 3 \times 10^{8}\text{ }m/s)

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