JEE Mains 2025 24 Jan Morning Shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQmediumPhotoelectric effect and dual natureDual Nature of Matter & de Broglie Wavelength

  An electron of mass m enters a uniform electric field $\vec{E}$=-E₀k̂ at t=0 with initial velocity $\vec{v}$=V₀î. If its initial de-Broglie wavelength is λ₀, its de-Broglie wavelength at time t is:

  Options

  • Option A

    λ₀√(1+m²V₀²/(e²E₀²t²))

  • Option B

    λ₀√(1+e²E₀²t²/(m²V₀²))

  • Option C

    λ₀/√(1+e²E₀²t²/(m²V₀²))

  • Option D

    λ₀/√(1+m²V₀²/(e²E₀²t²))

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• MCQeasyThermodynamicsThermodynamic Processes, P-V Diagrams and Work Done

  For an ideal gas, pressure is directly proportional to absolute temperature during a process. Statements: A: process is isochoric; B: work done is zero; C: internal energy increases when temperature increases. Choose the correct option.

  Options

  • Option A

    A and B are correct

  • Option B

    A and C are correct

  • Option C

    A, B and C are correct

  • Option D

    B and C are correct

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• IntegereasyCurrent electricityEquivalent Resistance & Networks

  A wire of total resistance 9 Ω is bent into an equilateral triangle. The equivalent resistance between any two vertices is:

  Your answer

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• MCQmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  An electron makes transition A→C emitting wavelength 2000 Å and B→C emitting wavelength 6000 Å. The wavelength emitted in transition A→B is:

  Options

  • Option A

    3000 Å

  • Option B

    4000 Å

  • Option C

    8000 Å

  • Option D

    2000 Å

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• IntegereasyWork , Power and EnergyWork Done by Forces

  A particle moves along a straight line under force F=α+βx², where β=-12 SI units. If the work done from x=0 to x=1 m is 12 J, α is:

  Your answer

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• MCQeasyCapacitorCapacitance & Types of Capacitors

  A parallel-plate capacitor initially has l=3 cm, b=1 cm and d=3 μm. Which changes increase its capacitance by a factor 10? A: l=6 cm,b=5 cm,d=3 μm; B: l=5 cm,b=2 cm,d=1 μm; C: l=5 cm,b=1 cm,d=30 μm; D: l=1 cm,b=1 cm,d=30 μm.

  Options

  • Option A

    A, B

  • Option B

    A, C

  • Option C

    B, C

  • Option D

    B, C, D

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• MCQmediumSimple Harmonic MotionDisplacement, Velocity, Acceleration and Phasor Representation in SHM

  In SHM x=A sinωt with time period 2 s and amplitude 1 cm, the ratio distance/displacement magnitude during the first 1.25 s is:

  Options

  • Option A

    2√2+1

  • Option B

    2√2-1

  • Option C

    1/√2

  • Option D

    1/(2√2)

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• MCQmediumGravitationSatellites, Orbital Motion & Kepler’s Laws

  Satellite A is in a circular orbit of radius R. Satellite B is in a circular orbit of radius 1.03R. The time period of B is greater than that of A by approximately:

  Options

  • Option A

    9%

  • Option B

    4.5%

  • Option C

    3%

  • Option D

    2.5%

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• MCQmediumRotational MotionAngular Momentum & Its Conservation

  A body of mass m is projected with speed v₀ at 45° to the horizontal. Its angular momentum about the point of projection at the highest point is:

  Options

  • Option A

    mv₀³/(4g)

  • Option B

    mv₀³/(4√2 g)

  • Option C

    mv₀²/(4√2 g)

  • Option D

    mv₀³/(2√2 g)

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• MCQeasyCapacitorCapacitor–Battery Connections & Charge Sharing

  A parallel-plate capacitor has plate area A, separation d and electric field E between the plates. Its stored energy is:

  Options

  • Option A

    (1/2)ε₀E²Ad

  • Option B

    (1/4)ε₀E²Ad

  • Option C

    ($\frac{3}{4}$)ε₀E²Ad

  • Option D

    ε₀E²Ad

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