JEE Mains 2024 29 Jan Morning Shift physics questions with solutions

Showing 1–10 of 30 questions

• MCQeasyCurrent electricityelectric current ,current density and resistance

  The electric current through a wire varies with time as I = I₀ + βt. where I₀ = 20 A and β = 3 A/s. The amount of electric charge crossed through a section of the wire in 20 s is :

  Options

  • Option A

    80 C

  • Option B

    1000 C

  • Option C

    800 C

  • Option D

    1600 C

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• MCQeasyProperties of solid and fluidproperties of fluid and surface tension

  Given below are two statements: Statement I : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water. Statement II : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in cold water. In the light of the above statements, choose the most appropriate from the options given below

  Options

  • Option A

    Both Statement I and Statement II are true

  • Option B

    Both Statement I and Statement II are false

  • Option C

    Statement I is true but Statement II is false

  • Option D

    Statement I is false but Statement II is true

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• NumericmediumCapacitorRC circuit

  A 16 Ω wire is bend to form a square loop. A 9V battery with internal resistance 1 Ω is connected across one of its sides. If a 4 μF capacitor is connected across one of its diagonals, the energy stored by the capacitor will be x/2 μJ. where x = _________.

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• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Match List I with List II

  List I
  A. ∮B.dl = μ₀i(c) + μ₀ε₀(dΦ(E)/dt)
  B. ∮E.dl = -dΦ(B)/dt
  C. ∮E.dA = Q/ε₀
  D. ∮B.dA= 0

  List II I. Gauss’ law for electricity II. Gauss' law for magnetism III. Faraday law IV. Ampere – Maxwell law

  Chose the correct answer from the options given below

  Options

  • Option A

    A-IV, B-I, C-III, D-II

  • Option B

    A-II, B-III, C-I, D-IV

  • Option C

    A-IV, B-III, C-I, D-II

  • Option D

    A-I, B-II, C-III, D-IV

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• NumericmediumElectrostaticselectric flux and gauss law

  An electron is moving under the influence of the electric field of a uniformly charged infinite plane sheet S having surface charge density +σ. The electron at t = 0 is at a distance of 1 m from S and has a speed of 1 m/s. The maximum value of σ if the electron strikes S at t = 1 s is α[mₑε₀/e] C/m² the value of α is

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• NumericmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  When a hydrogen atom going from n = 2 to n = 1 emits a photon, its recoil speed is x/5 m/s. Where x = ______ . (Use : mass of hydrogen atom = 1.6 × 10⁻²⁷ kg)

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• MCQeasyWork , Power and Energyconservative force and potential energy

  The potential energy function (in J) of a particle in a region of space is given as U = (2x² + 3y³ + 2z). Here x, y and z are in meter. The magnitude of x - component of force (in N) acting on the particle at point P (1, 2, 3) m is :

  Options

  • Option A

    2

  • Option B

    6

  • Option C

    4

  • Option D

    8

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• NumericmediumMagnetism and matterpole stength ,magnetic moment and magnetic field due to magnet

  The magnetic potential due to a magnetic dipole at a point on its axis situated at a distance of 20 cm from its center is 1.5 × 10⁻⁵ Tm. The magnetic moment of the dipole is__________ Am². (Given : μ₀/4π = 10⁻⁷ TmA⁻¹)

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• MCQmediumGeometrical opticslens and combination lens,silvered lens

  A biconvex lens of refractive index 1.5 has a focal length of 20 cm in air. Its focal length when immersed in a liquid of refractive index 1.6 will be:

  Options

  • Option A

    -16 cm

  • Option B

    -160 cm

  • Option C

    +160 cm

  • Option D

    +16 cm

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• MCQeasyCircular Motioncentripital force and centrifugal force

  If the radius of curvature of the path of two particles of same mass are in the ratio 3:4, then in order to have constant centripetal force, their velocities will be in the ratio of:

  Options

  • Option A

    √3 : 2

  • Option B

    1 : √3

  • Option C

    √3 : 1

  • Option D

    2 : √3

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