JEE Mains 2025 23 Jan Evening Shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQeasyAtomic Structure and X-raysX-Rays: Production, Types & Properties

  Statement-I: The graph of X-ray frequency f versus atomic number Z of a heavy element is a straight line. Statement-II: The graph of √f versus Z is a straight line. Choose the correct option.

  Options

  • Option A

    Both statements are correct

  • Option B

    Statement-I is incorrect and Statement-II is correct

  • Option C

    Statement-I is correct and Statement-II is incorrect

  • Option D

    Both statements are incorrect

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• MCQeasyElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  In an electromagnetic wave, the instantaneous electric field magnitude is 9.3 V m⁻¹. The corresponding magnetic field magnitude is approximately:

  Options

  • Option A

    3.1×10⁸ T

  • Option B

    27.9×10⁸ T

  • Option C

    3.1×10⁻⁸ T

  • Option D

    18.6×10⁻⁶ T

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• MCQeasyPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  In a photoelectric experiment, the stopping potential is 2 V and the work function is 2.14 eV. Given hc=1242 eV·nm, the wavelength of incident light is:

  Options

  • Option A

    200 nm

  • Option B

    300 nm

  • Option C

    600 nm

  • Option D

    400 nm

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• MCQmediumGravitationSatellites, Orbital Motion & Kepler’s Laws

  A satellite is nine times closer to Earth than the Moon. If the Moon's orbital period is 27 days, the satellite's orbital period is:

  Options

  • Option A

    3 days

  • Option B

    9 days

  • Option C

    1 day

  • Option D

    3√3 days

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• IntegermediumUnits, Dimensions, Measurements and ErrorsErrors in Measurement and Error Propagation

  The energy of a system varies as E(x,t)=x³$e^(-βt),$ where β=0.3 s⁻¹. Percentage error in x is 1.2% and percentage error in t is 1.6%. Find the maximum percentage error in E at t=5 s.

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• MCQmediumAC CircuitsSeries AC Circuits: Impedance, Phase Difference, Resonance and Power Factor

  In a series LCR circuit, L=100 mH and C=1 nF. The angular frequency at which current amplitude is maximum is:

  Options

  • Option A

    10⁴/(2π) rad s⁻¹

  • Option B

    10⁵/(2π) rad s⁻¹

  • Option C

    10⁵ rad s⁻¹

  • Option D

    10⁶ rad s⁻¹

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• MCQeasyCapacitorRC Circuits: Charging & Discharging

  During charging of a 2.5 μF capacitor in a DC circuit, the displacement current is 0.25 mA. Find the rate of change of capacitor voltage dV/dt.

  Options

  • Option A

    1 V s⁻¹

  • Option B

    10 V s⁻¹

  • Option C

    100 V s⁻¹

  • Option D

    0.1 V s⁻¹

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• MCQeasyElectrostaticElectric Potential & Potential Energy

  Two charges +7 C and -4 C are located at (-7,0,0) and (7,0,0). Taking k=9×10⁹ SI units, the electrostatic potential energy of the system is:

  Options

  • Option A

    -6×10⁹ J

  • Option B

    -18×10⁹ J

  • Option C

    18×10⁹ J

  • Option D

    6×10⁹ J

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• MCQmediumUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  Match the quantities with their dimensions: (a) magnetic field, (b) permittivity of free space, (c) moment of inertia, (d) velocity; (i) ML², (ii) M⁻¹L⁻³T⁴A², (iii) MT⁻²A⁻¹, (iv) LT⁻¹.

  Options

  • Option A

    (a)→(iii), (b)→(ii), (c)→(i), (d)→(iii)

  • Option B

    (a)→(iii), (b)→(iv), (c)→(iv), (d)→(iv)

  • Option C

    (a)→(iii), (b)→(ii), (c)→(i), (d)→(iv)

  • Option D

    (a)→(i), (b)→(ii), (c)→(iii), (d)→(iv)

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• MCQmediumRotational MotionTorque & Rotational Equilibrium

  A uniform disc of mass 2 kg and radius 1 m is acted upon by torque τ(t)=5t²-8t N m. The disc starts from rest. Find the power delivered by the torque at t=1 s.

  Options

  • Option A

    5 W

  • Option B

    3 W

  • Option C

    7 W

  • Option D

    9 W

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