JEE Mains 2025 28 Jan Morning Shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  An electromagnetic wave E=100 sin(kx-ωt) occupies a cylindrical region of length l and radius R with energy U₀. What electric-field equation will give the same energy U₀ in a cylinder of the same length but half the diameter?

  Options

  • Option A

    E=200 sin(kx-ωt)

  • Option B

    E=25 sin(ωt-kx)

  • Option C

    E=50 sin(kx-ωt)

  • Option D

    E=400 sin(ωt-kx)

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumWork , Power and EnergyConservative Forces & Potential Energy

  Assertion: Work done by a central force is independent of path. Reason: Potential energy is associated with every force.

  Options

  • Option A

    Both Assertion and Reason are correct

  • Option B

    Assertion is correct, Reason is incorrect

  • Option C

    Assertion is incorrect, Reason is correct

  • Option D

    Both Assertion and Reason are incorrect

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumThermodynamicsKinetic Theory of Gases and Molecular Properties

  Which graph correctly represents root mean square speed $v_rms$ of an ideal gas versus absolute temperature T?

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumsemiconductorLogic Gates & Boolean Operations

  For the logic circuit shown in the original question figure, which option represents the equivalent gate?

  

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumCapacitorRC Circuits: Charging & Discharging

  Two capacitors C₁ and C₂ are connected separately across the same battery. Their charge-versus-time curves in the original figure show final charge Q₂>Q₁. If stored energies are U₁ and U₂, which is correct?

  

  Options

  • Option A

    C₁>C₂ and U₁>U₂

  • Option B

    C₁<C₂ and U₁<U₂

  • Option C

    C₁>C₂ and U₁<U₂

  • Option D

    C₁<C₂ and U₁>U₂

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQeasyCurrent electricityEquivalent Resistance & Networks

  Find the equivalent resistance across A and B for the resistor network shown in the original question figure.

  

  Options

  • Option A

    R

  • Option B

    R/6

  • Option C

    R/3

  • Option D

    R/9

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumCenter of maas , Momentum and CollisionCentre of Mass & Its Calculation

  A rectangular lamina occupies 0≤x≤a, 0≤y≤b and has surface mass density σ=σ₀x/(ab). Its centre of mass is:

  

  Options

  • Option A

    (2a/3, 2b/3)

  • Option B

    (2a/3, b/2)

  • Option C

    (a/3, b/2)

  • Option D

    (a/2, b/2)

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• IntegermediumUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  The dimensions of Young's modulus per unit length are MᵃLᵇTᶜ. Find |a+b+c|.

  Your answer

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumPhotoelectric effect and dual natureDual Nature of Matter & de Broglie Wavelength

  A photon of wavelength λ has energy E₀, equal to the kinetic energy of a proton of mass $m_p.$ The ratio $\lambda_{p}$/$\lambda_{ph}$of de Broglie wavelength of the proton to wavelength of the photon is:

  Options

  • Option A

    (1/c)√(2E₀/$m_p)$

  • Option B

    (1/c)√(E₀/(2$m_p))$

  • Option C

    (2/c)√(E₀/$m_p)$

  • Option D

    (1/2c)√(E₀/$m_p)$

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumGeometrical opticsDispersion, Dispersive Power & Prism Combinations

  Two thin prisms of re$fractive$ indices 1.54 and 1.72 are arranged so that their deviations cancel. If the first prism angle is 4°, find the second prism angle.

  Options

  • Option A

    2°

  • Option B

    3°

  • Option C

    4°

  • Option D

    3.5°

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →