JEE Mains 2025 28 Jan Morning Shift physics questions with solutions

Showing 1–10 of 20 questions

• MCQdifficultWork , Power and Energyconservation of mechanical energy

  A bead of mass m moves on a smooth vertical ring of radius R. A spring of natural length R and spring constant K is fixed along a vertical diameter as shown. When slightly disturbed from the bottom point, it reaches point C with speed v. Find v.

  

  Options

  • Option A

    √{[KR²(√2-1)+2mgR]/m}

  • Option B

    √{[2KR²(√2-1)+2mgR]/m}

  • Option C

    √{[2KR²(√2-1)+mgR]/m}

  • Option D

    √{[KR²(√2-1)+mgR]/m}

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumWork , Power and Energyconservative force and 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 →
• MCQmediumCurrent electricityequivalent resistance

  A square and an equilateral triangle have the same perimeter a and the same resistance per unit length. Find the ratio of equivalent resistances between adjacent vertices, $R_square/R_triangle.$

  

  Options

  • Option A

    32/27

  • Option B

    27/32

  • Option C

    8/9

  • Option D

    9/8

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  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 →
• MCQmediumUnit dimension and errorvernier callipers and screw gauge

  The length and breadth of a rectangular sheet are 5 mm and 2.5 mm, measured with a screw gauge of pitch 0.75 mm and 15 circular-scale divisions. Find the maximum possible error in its area.

  Options

  • Option A

    0.225 mm²

  • Option B

    0.375 mm²

  • Option C

    0.75 mm²

  • Option D

    0.30 mm²

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• IntegermediumWave Opticsyoung's dubble slit experiments

  In YDSE, the 10th bright fringe is 10 mm from the central maximum for wavelength 600 nm. For wavelength 660 nm, the distance of the 10th bright fringe from the central maximum is:

  Your answer

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQmediumNuclear physicsradioactivity and law of decay

  Which of the following represents the correct β⁻ decay of a neutron?

  Options

  • Option A

    n → p + e⁻ + ν

  • Option B

    n → p + e⁺ + ν̄

  • Option C

    n → p + e⁺ + ν

  • Option D

    n → p + e⁻ + ν̄

  Check answerShow answer

  JEE Mains 2025 28 Jan Morning Shift

  Open question & full solution →
• MCQeasyCurrent electricityequivalent resistance

  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 →
• MCQmediumPhotoelectric effect and dual nature of matterdebrogllie duel nature of light

  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 →
• MCQmediumsemiconductorlogic gate

  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 →