JEE Mains 2025 23 Jan Evening Shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQeasyWave Motiongeneral equation of wave

  A wave is described by y(x,t)=4.0 sin(20×10⁻³x+600t) mm. If its speed is n×10⁴ m s⁻¹, find n.

  Options

  • Option A

    7

  • Option B

    5

  • Option C

    4

  • Option D

    3

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• IntegermediumGeometrical opticsprism and thin prism

  For a prism, the minimum deviation δ_m is equal to the prism angle A. If the re$fractive$ index is √3, find the minimum deviation.

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• MCQmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  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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• MCQeasyGeometrical opticslens and combination lens,silvered lens

  A concave mirror of focal length f is completely immersed in a fluid of re$fractive$ index μ. Its new focal length is:

  Options

  • Option A

    μf

  • Option B

    f

  • Option C

    f/(μ-1)

  • Option D

    f/μ

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• MCQmediumUnit dimension and errorDimension and its application

  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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• IntegereasyWork , Power and Energykinetic enegy and work engery theorem

  A particle is projected at 60° to the horizontal. If its initial kinetic energy is KE₀ and the kinetic energy at maximum height is KE₀/x, find x.

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• MCQmediumGravitationsattelite and keplers law

  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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• MCQmediumRotational Motiontorque and 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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• IntegermediumCapacitorRC circuit

  An 8 μF capacitor is connected across the 10 Ω resistor in a series circuit containing 10 Ω and 15 Ω resistors with a 5 V DC source. Find the steady-state charge on the capacitor. (The source paper prints the charge unit as μF.)

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  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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