JEE Mains 2024 31 Jan Evening Shift physics questions with solutions

Showing 1–10 of 29 questions

• MCQeasyElectrostaticElectric Charge & Coulomb’s Law

  Force between two point charges q₁ and q₂ placed in vacuum at ‘r’ cm apart is F. Force between them when placed in a medium having dielectric K = 5 at ‘r/5’ cm apart will be:

  Options

  • Option A

    F/25

  • Option B

    5F

  • Option C

    F/5

  • Option D

    25F

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• MCQmediumProperties of solid and fluidViscosity, Stokes' Law and Terminal Velocity

  A small spherical ball of radius r, falling through a viscous medium of negligible density has terminal velocity 'v'. Another ball of the same mass but of radius 2r, falling through the same viscous medium will have terminal velocity:

  Options

  • Option A

    v/2

  • Option B

    v/4

  • Option C

    4v

  • Option D

    2v

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

  In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

  Options

  • Option A

    Doubled

  • Option B

    Quadrupled

  • Option C

    Zero

  • Option D

    Halved

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• MCQeasyGravitationAcceleration Due to Gravity & Escape Velocity

  The mass of the moon is 1/144 times the mass of a planet and its diameter 1/16 times the diameter of a planet. If the escape velocity on the planet is v, the escape velocity on the moon will be:

  Options

  • Option A

    v/3

  • Option B

    v/4

  • Option C

    v/12

  • Option D

    v/6

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• NumericmediumProperties of solid and fluidElastic Properties of Solids: Stress, Strain and Elastic Moduli

  Two blocks of mass 2 kg and 4 kg are connected by a metal wire going over a smooth pulley as shown in figure. The radius of wire is 4.0 × 10⁻⁵ m and Young's modulus of the metal is 2.0 × 10¹¹ N/m². The longitudinal strain developed in the wire is 1/(απ). The value of α is____. [Use g = 10 m/s²]

  

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• MCQmediumMagnetic effect of currentMagnetic Dipole Moment, Torque and Equilibrium of Current-Carrying Loops

  A uniform magnetic field of 2 × 10⁻³ T acts along positive Y-direction. A rectangular loop of sides 20 cm and 10 cm with current of 5 A is Y-Z plane. The current is in anticlockwise sense with reference to negative X axis. Magnitude and direction of the torque is :

  Options

  • Option A

    2 × 10⁻⁴ N m along positive Z-direction

  • Option B

    2 × 10⁻⁴ N m along negative Z-direction

  • Option C

    2 × 10⁻⁴ N m along positive X-direction

  • Option D

    2 × 10⁻⁴ N m along positive Y-direction

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• MCQeasyWave OpticsPolarisation of Light

  When unpolarized light is incident at an angle of 60° on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

  Options

  • Option A

    30°

  • Option B

    60°

  • Option C

    90°

  • Option D

    45°

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• MCQeasyNewtons law of motion and FrictionPulley Systems & Applications

  A light string passing over a smooth light fixed pulley connects two blocks of masses m₁ and m₂. If the acceleration of the system is g/8, then the ratio of masses is

  Options

  • Option A

    9/7

  • Option B

    8/1

  • Option C

    4/3

  • Option D

    5/3

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• NumericmediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  Two identical spheres each of mass 2 kg and radius 50 cm are fixed at the ends of a light rod so that the separation between the centers is 150 cm. Then, moment of inertia of the system about an axis perpendicular to the rod and passing through its middle point is x/20 kg m², where the value of x is ____.

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• NumericeasyElectromagnetic InductionMagnetic Flux,Faraday's Laws of Electromagnetic Induction and Lenz's Law

  The magnetic flux ϕ (in weber) linked with a closed circuit of resistance 8 Ω varies with time (in seconds) as ϕ = 5t² - 36t + 1. The induced current in the circuit at t = 2s is _______ A.

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