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

Showing 1–10 of 20 questions

• MCQeasyElectrostaticselectric 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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• MCQmediumThermodyanmicsheat 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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• 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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• 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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• 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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• MCQmediumThermodyanmicsheat 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 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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• MCQeasyUnit dimension and errorDimension and its application

  Find the dimensions of B/μ₀.

  Options

  • Option A

    [AL]

  • Option B

    [AL⁻¹]

  • Option C

    [MAL]

  • Option D

    [MALT⁻¹]

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• MCQmediumElectrostaticsElectric field intensity

  An electron enters the region between the plates of a parallel-plate capacitor with horizontal speed vₓ = 10⁶ m/s. The plate length is ℓ = 10 cm and the electric field magnitude is E = 9.1 N/C.

  Given electron mass m = 9.1×10⁻³¹ kg, find the magnitude of vᵧ when the electron leaves the plates.

  

  Options

  • Option A

    1.6×10⁴ m/s

  • Option B

    1.6×10⁵ m/s

  • Option C

    1.6×10⁷ m/s

  • Option D

    1.6×10³ m/s

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  JEE Main 2025 (Online) 22 jan morning Shift

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