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Day 432: JEE Mains Physics

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

  1. Question 1

    Dual Nature of Radiation and Matter. Asked once: 5 Apr 2026 S2

    18
    An electron is travelling with a velocity vv in free space and when it enters a medium, its velocity is reduced by 20%20\%. The de Broglie wavelength of electron in the medium is αλ0\alpha\lambda_{0}, where λ0\lambda_{0} is its de Broglie wavelength in free space. The value of α\alpha is ____\_\_\_\_

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  2. Question 2

    Electromagnetic Induction. Asked once: 8 Apr 2026 S2

    15
    A 30 cm long solenoid has 10 turns per cm and area of 5 cm25{\text{ }cm}^{2}. The current through the solenoid coil varies from 2 A to 4 A in 3.14 s. The e.m.f. induced in the coil is α×10−5 V\alpha \times10^{- 5}\text{ }V. The value α\alpha is ____\_\_\_\_ .

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  3. Question 3

    Electromagnetic Waves. Asked once: 8 Apr 2026 S2

    13
    A monochromatic source of light operating at 15 kW emits 2.5×10222.5 \times10^{22} photons/s. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to ____\_\_\_\_ . (Take h=6.6×10−34 Jh = 6.6 \times10^{- 34}\text{ }J.s and c=3×108 m/sc = 3 \times10^{8}\text{ }m/s ).

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  4. Question 4

    Electrostatics. Asked once: 5 Apr 2026 S2

    13
    A particle of charge qq and mass mm is projected from origin with an initial velocity v→=(v02x^+v02y^)\overrightarrow{v}=\left( \frac{v_{0}}{\sqrt{2}}\widehat{x}+\frac{v_{0}}{\sqrt{2}}\widehat{y} \right). There exists a uniform magnetic field B→=B0z^\overrightarrow{B}=B_{0}\widehat{z} and a space varying electric field E→=E0e−λxx^\overrightarrow{E}=E_{0}e^{-\lambda x}\widehat{x} within the region 0≤x≤L0 \leq x \leq L. After travelling a distance such that x -coordinate has changed from x=0x= 0 to x=Lx=L, the change in the kinetic energy is ____\_\_\_\_ .

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  5. Question 5

    Gravitation. Asked once: 24 Jan 2026 S1

    20
    Three masses 200 kg,300 kg200\text{ }kg,300\text{ }kg and 400 kg are placed at the vertices of an equilateral triangle with sides 20 m . They are rearranged on the vertices of a bigger triangle of side 25 m and with the same centre. The work done in this process ____\_\_\_\_ J. (Gravitational constant G=6.7×10−11 N m2/kg2G = 6.7 \times10^{- 11}\text{ }N{\text{ }m}^{2}/kg^{2} )

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