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

Showing 1–10 of 20 questions

• 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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  JEE Main 2025 (Online) 22 jan morning Shift

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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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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQmediumThermodynamicsheat and principle of calorimeter

  Ice at -10°C is converted completely into steam at 110°C. The mass of ice is 10⁻³ kg. Using the standard heat capacities and latent heats used in the question, the heat required is:

  Options

  • Option A

    730 cal

  • Option B

    900 cal

  • Option C

    1210 cal

  • Option D

    870 cal

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• MCQmediumWave Opticsyoung's dubble slit experiments

  The whole Young's double-slit experiment apparatus is immersed in a liquid of re$fractive$ index μ. What happens to the fringe width?

  Options

  • Option A

    Fringe width increases

  • Option B

    Fringe width decreases

  • Option C

    Fringe width remains unchanged

  • Option D

    It increases on one side and decreases on the other

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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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• MCQmediumWave Motionstationary wave in sound and organ pipe ,resonance tube

  A closed organ pipe in its 9th harmonic resonates with the 4th harmonic of an open organ pipe. The length of the closed pipe is 10 cm. Find the length of the open organ pipe.

  Options

  • Option A

    80/7 cm

  • Option B

    110/9 cm

  • Option C

    100/9 cm

  • Option D

    15 cm

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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.

  

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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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• 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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• 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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