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

Showing 1–10 of 20 questions

• MCQmediumWave MotionStanding Sound Waves, Organ Pipes and Resonance Tubes

  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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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQmediumElectrostaticElectric Field & Superposition Principle

  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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• MCQmediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  From a uniform solid sphere of mass M and radius R, a concentric spherical cavity of radius R/2 is created. Find the moment of inertia about an axis passing through the common centre.

  

  Options

  • Option A

    31MR²/48

  • Option B

    31MR²/80

  • Option C

    13MR²/32

  • Option D

    21MR²/32

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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQmediumCapacitorCapacitors with Dielectrics

  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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• MCQmediumWave OpticsYoung's Double-Slit Experiment (YDSE)

  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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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQeasyUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  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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  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.

  

  Your answer

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

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• MCQmediumGravitationGravitation, Gravitational Field & Potential Energy

  A solid sphere of mass M and radius R exerts gravitational force F on a point mass outside it. A concentric spherical mass M/7 is removed from the sphere. What is the new gravitational force?

  Options

  • Option A

    F/7

  • Option B

    6F/7

  • Option C

    5F/7

  • Option D

    3F/7

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  JEE Main 2025 (Online) 22 jan morning Shift

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• MCQmediumThermodynamicsThermal Radiation, Blackbody Radiation and Stefan-Boltzmann Law

  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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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  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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  JEE Main 2025 (Online) 22 jan morning Shift

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