NEET 2025 physics questions with solutions

Showing 1–10 of 45 questions

• MCQmediumMixed Chapter

  The Sun rotates once every 27 days. Assuming it remains a uniform-density sphere and doubles its radius without any external torque, calculate its new rotation period.

  Options

  • Option A

    100 days

  • Option B

    105 days

  • Option C

    115 days

  • Option D

    108 days

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• MCQmediumMixed Chapter

  Three identical rods are thermally connected in series. The left and right rods have conductivity 2K and the middle rod conductivity K. Their outer ends are at 3T and T. If junction temperatures are T₁ and T₂, find T₁/T₂. Image

  Options

  • Option A

    3/2

  • Option B

    4/3

  • Option C

    5/3

  • Option D

    5/4

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• MCQmediumMixed Chapter

  A particle moves in one dimension according to t = x² + x (in consistent units). Find acceleration a as a function of position x.

  Options

  • Option A

    -2/(x + 2)³

  • Option B

    -2/(2x + 1)³

  • Option C

    +2/(x + 1)³

  • Option D

    +2/(2x + 1)

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• MCQmediumMixed Chapter

  A parallel-plate capacitor has plate gap d. Two dielectric slabs of constants K₁ and K₂, with thicknesses 3d/8 and d/2, are inserted; the remaining gap is air. The capacitance doubles. Given K₁ = 1.25K₂, find K₁. Image

  Options

  • Option A

    2.66

  • Option B

    2.33

  • Option C

    1.60

  • Option D

    1.33

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• MCQmediumMixed Chapter

  An electron moves at speed c/100 perpendicular to a uniform magnetic field of magnitude 9 × 10⁻⁴ T. What orientation and magnitude of a uniform electric field would keep it undeflected? Take c = 3 × 10⁸ m/s.

  Options

  • Option A

    E perpendicular to B, magnitude 27 × 10⁴ V/m

  • Option B

    E perpendicular to B, magnitude 27 × 10² V/m

  • Option C

    E parallel to B, magnitude 27 × 10² V/m

  • Option D

    E parallel to B, magnitude 27 × 10⁴ V/m

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• MCQmediumMixed Chapter

  In a camera, four similar thin convex lenses are axially in contact. According to the question’s idealized lens-combination model, compare their combined power and total magnification with power p and magnification m of each lens.

  Options

  • Option A

    4p and 4m

  • Option B

    p/4 and 4m

  • Option C

    4p and m⁴

  • Option D

    p/4 and m⁴

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• MCQmediumMixed Chapter

  Find the de Broglie wavelength of the electron in the n = 2 orbit of hydrogen. Take the Bohr radius a₀ = 0.052 nm.

  Options

  • Option A

    0.067 nm

  • Option B

    0.67 nm

  • Option C

    1.67 nm

  • Option D

    2.67 nm

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• MCQmediumMixed Chapter

  A physical quantity P is related to measured quantities a, b, c and d by P = a³b²/(c√d). If the respective percentage measurement errors in a, b, c, d are 1%, 3%, 2%, 4%, find the maximum percentage error in P.

  Options

  • Option A

    10%

  • Option B

    2%

  • Option C

    13%

  • Option D

    15%

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• MCQmediumMixed Chapter

  A bob of mass m on a light string of length ℓ is given horizontal speed v₀ at the bottom of a vertical circle. At point P, where OP makes angle θ above the horizontal, the string just becomes slack. Find vₚ/v₀. Image

  Options

  • Option A

    √(sin θ)

  • Option B

    √[1/(2 + 3 sin θ)]

  • Option C

    √[cos θ/(2 + 3 sin θ)]

  • Option D

    √[sin θ/(2 + 3 sin θ)]

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• MCQmediumMixed Chapter

  A full-wave centre-tapped rectifier with diodes D₁ and D₂ is shown. Its input voltage is Vᵢₙ = 220 sin(100πt) V. At t = 15 ms, which diode is forward biased? Image

  Options

  • Option A

    D₁ forward, D₂ reverse

  • Option B

    D₁ reverse, D₂ forward

  • Option C

    Both forward

  • Option D

    Both reverse

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