JEE Mains 2025 7 April Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• IntegermediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  Three bodies A, B and C are respectively a disc, a solid sphere and a spherical shell, all of the same mass M and radius R, arranged as shown in the original figure. The moment of inertia of the complete system about axis PQ is (x/15)I, where I = MR²/4 is the moment of inertia of the disc about a diameter. Find x

  

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• MCQeasyUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  If ε₀ is the permittivity of free space and $\phi_{E}$is the electric flux through a closed surface, the quantity ε₀(d$\phi_{E}$/dt) has the dimensions of:

  Options

  • Option A

    Electric field

  • Option B

    Electric potential

  • Option C

    Electric charge

  • Option D

    Electric current

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• MCQmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  Two harmonic waves moving in the same direction superimpose to form x = a cos(1.5t) cos(50.5t), where t is in seconds. Find the beat period, rounded to the nearest integer.

  Options

  • Option A

    6 s

  • Option B

    4 s

  • Option C

    1 s

  • Option D

    2 s

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• MCQeasyMagnetic effect of currentMotion of Charged Particles in a Magnetic Field

  A particle of charge q, mass m and kinetic energy E enters a uniform magnetic field perpendicular to its velocity and follows a circular path of radius r. Which graph in the original figure correctly represents r as a function of E?

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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• MCQmediumCurrent electricityEquivalent Resistance & Networks

  A wire of total resistance R is bent into a triangular pyramid as shown in the original figure, with all six segments of equal length. The equivalent resistance between vertices A and B is R/n. Find n.

  

  Options

  • Option A

    16

  • Option B

    14

  • Option C

    10

  • Option D

    12

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

  Two wires A and B are made of the same material. Their lengths satisfy $L_A/L_B$ = 1/3 and their diameters satisfy $d_A/d_B$ = 2. If the same tensile force is applied to both wires, the ratio of elongations Δ$L_A:ΔL_B$ is:

  Options

  • Option A

    1:6

  • Option B

    1:12

  • Option C

    3:4

  • Option D

    1:3

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• MCQeasyNewtons law of motion and FrictionFriction in Single-Block Systems

  A cubic block slides down a 60° rough incline with acceleration g/2. The coefficient of kinetic friction is:

  Options

  • Option A

    √3-1

  • Option B

    √3/2

  • Option C

    √2/3

  • Option D

    1-√3/2

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• MCQmediumMagnetic effect of currentMotion of Charged Particles in a Magnetic Field

  Two uniform magnetic fields B₁ and B₂, both perpendicular to the plane of the paper, occupy adjacent regions separated by a straight interface as shown in the original figure. A particle of mass m and charge q starts at the interface with speed v, enters region 2, returns to the interface, then moves through region 1 and reaches the interface again. Given B₂ > B₁, the displacement along the interface is:

  

  Options

  • Option A

    (2mv/qB₁)(1-B₂/B₁)

  • Option B

    (mv/qB₁)(1-B₁/B₂)

  • Option C

    (mv/qB₁)(1-B₂/B₁)

  • Option D

    (2mv/qB₁)(1-B₁/B₂)

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• MCQmediumWork , Power and EnergyPower & Its Applications

  An object of mass 1000 g experiences a time-dependent force F = (2t, 3t²) N. Assuming zero initial velocity, the instantaneous power generated by the force at time t is:

  Options

  • Option A

    (2t²+3t³) W

  • Option B

    (2t²+18t³) W

  • Option C

    (3t³+5t⁵) W

  • Option D

    (2t³+3t⁵) W

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• MCQmediumGeometrical opticsLenses, Lens Combinations & Silvered Lenses

  Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially 10 cm apart. The power of the combination is:

  Options

  • Option A

    5 D

  • Option B

    1 D

  • Option C

    20 D

  • Option D

    10 D

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