JEE Main 2025 (Online) 22 jan morning shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQmediumCapacitorcapacitor with dielectric

  A charged capacitor is disconnected from the battery. A dielectric slab of dielectric constant K is then inserted completely between the plates. If the initial charge is Q₁ and the final charge is Q₂, find Q₁/Q₂.

  Options

  • Option A

    1

  • Option B

    1/2

  • Option C

    2

  • Option D

    2/3

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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQmediumsemiconductorlogic gate

  From the four diode connections shown in the original question figure, identify the diode connected in forward bias.

  Options

  • Option A

    

    Option (1)

  • Option B

    

    Option (2)

  • Option C

    

    Option (3)

  • Option D

    

    Option (4)

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• MCQeasyElectrostaticelectric flux and gauss law

  A point charge q is placed at the edge of an imaginary cube of side a as shown in the original question figure.Find the net electric flux through the cube.

  

  Options

  • Option A

    q/(4ε₀)

  • Option B

    q/(8ε₀)

  • Option C

    q/(6ε₀)

  • Option D

    q/(2ε₀)

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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Light of wavelength 550 nm is incident on cerium and lithium surfaces. Their work functions are 1.9 eV and 2.5 eV respectively. Photoelectrons will be emitted from:

  Options

  • Option A

    Cerium only

  • Option B

    Lithium only

  • Option C

    Both surfaces

  • Option D

    Neither surface

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• IntegereasyCurrent electricityCircuit Theory & Kirchhoff’s Laws

  For the electrical circuit shown in the original question figure, find the current drawn from the battery.

  

  Your answer

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  JEE Main 2025 (Online) 22 jan morning shiftkinematics previous year

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• MCQmediumThermodynamicsheat transfer due to radiation

  Two spherical black bodies have radii 0.8 m and 0.2 m and temperatures 400 K and 800 K respectively. Find the ratio P₁/P₂ of their rates of heat loss.

  Options

  • Option A

    8

  • Option B

    4

  • Option C

    2

  • Option D

    1

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• MCQmediumGeometrical opticslens and combination lens,silvered lens

  Find the equivalent power of the thin-lens combination shown in the original figure. The figure indices are μ₁=4/3, μ₂=3/2 and μ₃=4/3, and the surface radii are R₁ and R₂.

  

  Options

  • Option A

    +(R₁+R₂)/(R₁R₂)

  • Option B

    -(R₁+R₂)/(R₁R₂)

  • Option C

    -(R₁+R₂)/(6R₁R₂)

  • Option D

    +(R₁+R₂)/(6R₁R₂)

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• MCQmediumCapacitorcapacitor with dielectric

  Find the equivalent capacitance for the capacitor arrangement shown in the original question figure. The three dielectric constants are K₁, K₂ and K₃; plate area is A and separation is d.

  

  Options

  • Option A

    (Aε₀/d)[(K₁K₂+K₂K₃+K₃K₁)/(K₁+K₂)]

  • Option B

    (Aε₀/d)[(2K₁K₂+K₂K₃+K₃K₁)/(2(K₁+K₂))]

  • Option C

    (Aε₀/d)[(K₁K₂+K₂K₃+K₃K₁)/(2(K₁+K₂))]

  • Option D

    (Aε₀/2d)[(K₁K₂+K₂K₃+K₃K₁)/(K₁+K₂)]

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  JEE Main 2025 (Online) 22 jan morning Shift

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• IntegereasyWork , Power and Energyvertical circular motion

  A particle shown in the original figure is just able to complete vertical circular motion.Find the ratio of its kinetic energy at point A to its kinetic energy at point B.

  

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  JEE Main 2025 (Online) 22 jan morning shiftkinematics previous year

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• MCQmediumGeometrical opticslens and combination lens,silvered lens

  The equiconvex lens shown in the original figure is silvered on one side. Its μ and the radius magnitude of each curved surface is R. For what object distance from the lens will the image be formed on the object itself.

  

  Options

  • Option A

    μR

  • Option B

    R/μ

  • Option C

    R/(2μ-1)

  • Option D

    R/(2μ-2)

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