JEE Mains 2025 7 April Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumGeometrical opticslens and combination lens,silvered lens

  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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• IntegermediumThermodyanmicsheat transfer due to radiation

  A wire of length 10 cm and diameter 0.5 mm radiates 94.2 W at temperature 1727°C. Its emissivity is x/8. Given σ = 6.0×10⁻⁸ W m⁻² K⁻⁴ and π = 3.14, find x.

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• MCQmediumCurrent electricityequivalent resistance

  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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• IntegermediumRotational Motionmoment of inertia and kinetic energy in pure rotation

  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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• MCQmediumWave Motionbeat and properties of sound like loudness,pitch

  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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• IntegermediumThermodyanmicsthermodynmic process and work done

  An ideal gas undergoes the cyclic process shown in the original P-V graph. The cycle is a circle spanning P = 300 to 500 kPa and V = 150 to 350 cm³. The work done by the gas in one cycle is N×10⁻¹ J. Take π = 3.14. Find N.

  

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• MCQmediumAc Cirucuitsavg value and rms value of ac

  An alternating current is represented by i = 5√2 + 10cos(650πt + π/6) ampere. The RMS value of the current is:

  Options

  • Option A

    50 A

  • Option B

    100 A

  • Option C

    10 A

  • Option D

    5√2 A

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• MCQeasyMagnetism and matterproperties of magnetic substance

  A current-carrying solenoid is filled with magnesium having magnetic susceptibility χ = 1.2×10⁻⁵. The percentage increase in the magnetic field is:

  Options

  • Option A

    (6/5)×10⁻³ %

  • Option B

    (5/6)×10⁻⁵ %

  • Option C

    (5/6)×10⁻⁴ %

  • Option D

    (5/3)×10⁻⁵ %

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• IntegermediumGeometrical opticsapperant depth and shift due to slab

  A container has a liquid of refractive index 1.2 up to height 60 cm. A second immiscible liquid of refractive index 1.6 is added above it to height H. When viewed normally from above, the apparent upward shift of the bottom is 40 cm. Find H in cm.

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• MCQmediumCenter of maas , Momentum and Collisioncenter of mass and question based on it

  A uniform rod of total length 5L is bent at right angles so that one arm has length 2L along +x and the other has length 3L along +y, as shown in the original figure. For L = 10 cm, the position vector of the centre of mass from the bend is:

  

  Options

  • Option A

    2i + 3j cm

  • Option B

    3i + 7j cm

  • Option C

    5i + 8j cm

  • Option D

    4i + 9j cm

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