JEE Mains 2025 29 Jan Evening Shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQmediumWave OpticsHuygens' Principle & Interference of Light

  A soap film on a ring of radius 3 cm evaporates. Light of wavelength 580 nm gives minimum transmission every 12 s. Re$fractive$ index is 1.45. The rate of evaporation is:

  Options

  • Option A

    1.5π×10⁻¹³ m³/s

  • Option B

    15π×10⁻¹³ m³/s

  • Option C

    3π×10⁻¹³ m³/s

  • Option D

    3π×10⁻¹² m³/s

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• IntegereasyKinematics Part-1 (one dimension)Ghraphical problem of kinematics

  From the velocity-time graph in the original paper, velocity remains positive from t=0 to 4 s and the area under the graph is 30 m. The distance travelled is:

  

  Your answer

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  For a hydrogen-like single-electron atom of atomic number Z, the frequency of revolution of the electron in the nth Bohr orbit is proportional to:

  Options

  • Option A

    Z/n²

  • Option B

    Z²/n³

  • Option C

    n³/Z

  • Option D

    Z/n

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQmediumMagnetic effect of currentBiot-Savart Law and Magnetic Field Due to Straight Wires, Circular Arcs and Loops

  An equilateral triangular wire frame of side l carries current i. The magnetic field at its centroid is:

  Options

  • Option A

    3μ₀i/(4πl)

  • Option B

    3μ₀i/(πl)

  • Option C

    9μ₀i/(2πl)

  • Option D

    μ₀i/(πl)

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQmediumGeometrical opticsRefraction at Spherical Surfaces

  At a spherical refractive interface, an object in medium μ₁=1.3 is 13 cm from the surface and forms a real image in medium μ₂=1.4 that is twice in size. The radius of curvature is:

  Options

  • Option A

    3/2 cm

  • Option B

    2/3 cm

  • Option C

    $\frac{3}{4}$ cm

  • Option D

    4/3 cm

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• IntegermediumElectromagnetic InductionMagnetic Flux,Faraday's Laws of Electromagnetic Induction and Lenz's Law

  A conducting rod slides with constant velocity on two rails making an angle 60° in a uniform magnetic field. If the motional emf varies as E=ctⁿ, the value of n is:

  

  Your answer

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  For a planet, Earth's mass $M_e=8M_p$ and Earth's radius $R_e=2R_p.$ If Earth's escape speed is 11.2 km/s, the planet's escape speed is:

  Options

  • Option A

    11.2√2 km/s

  • Option B

    5.6 km/s

  • Option C

    5.6√2 km/s

  • Option D

    11.2 km/s

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  In an electromagnetic wave travelling along +z, $\vec{B}$=(√3/2 î + 1/2 ĵ)30 sin(ωt-kz). The corresponding electric field is:

  Options

  • Option A

    9×10⁹(1/2 î+√3/2 ĵ)sin(ωt-kz)

  • Option B

    9×10⁹(1/2 î-√3/2 ĵ)sin(ωt-kz)

  • Option C

    9×10⁹(1/2 î+√3/2 ĵ)cos(ωt-kz)

  • Option D

    9×10⁹(1/2 î-√3/2 ĵ)cos(ωt-kz)

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQeasyCapacitorCapacitance & Types of Capacitors

  The energy density between the plates of a parallel-plate capacitor having potential difference V and plate separation d is:

  Options

  • Option A

    ε₀V²/(2d²)

  • Option B

    ε₀Vd²/2

  • Option C

    ε₀AV²/(2d)

  • Option D

    ε₀AV²/(2d²)

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →
• MCQmediumGeometrical opticsSpherical Mirrors & Image Formation

  A concave mirror forms a real image three times the size of a real object. The distance between object and image is 20 cm. The radius of curvature of the mirror is:

  Options

  • Option A

    10 cm

  • Option B

    12 cm

  • Option C

    15 cm

  • Option D

    20 cm

  Check answerShow answer

  JEE Mains 2025 29 Jan Evening Shift

  Open question & full solution →