JEE Mains 2025 4 April Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumProperties of solid and fluidproperties of fluid and surface tension

  Two liquids A and B have contact angles $\theta_{A}$and $\theta_{B}$ in a capillary tube. If K = cos$\theta_{A}$/cos$\theta_{B}$, identify the correct statement.

  Options

  • Option A

    If K is negative, both liquids A and B have concave meniscus

  • Option B

    If K is zero, liquid A has convex meniscus and liquid B has concave meniscus

  • Option C

    If K is negative, liquid A has concave meniscus and liquid B has convex meniscus

  • Option D

    If K is negative, both liquids A and B have convex meniscus

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• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Assertion (A): In the photoelectric effect, increasing the intensity of incident light increases the stopping potential. Reason (R): Increasing the intensity of light increases the rate of emission of photoelectrons, provided the incident frequency is greater than the threshold frequency. Choose the correct answer.

  Options

  • Option A

    A is true but R is false

  • Option B

    Both A and R are true but R is NOT the correct explanation of A

  • Option C

    Both A and R are true and R is the correct explanation of A

  • Option D

    A is false but R is true

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• MCQmediumElectrostaticselectric dipole and dipole moment

  Two small spherical balls, each of mass 10 g and carrying charges -2 μC and +2 μC, are attached to the ends of a very light rigid rod of length 20 cm. The rod is placed near an infinite non-conducting sheet having uniform surface charge density 100 μC/m², with the rod making an angle 30° with the electric field. Take ε₀ = 8.85×10⁻¹² C²/(N·m²). The magnitude of net torque on the rod is:

  Options

  • Option A

    11.2 N·m

  • Option B

    112 N·m

  • Option C

    2.24 N·m

  • Option D

    1.12 N·m

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• IntegermediumGeometrical opticsspherical mirror

  The distance between an object and its image formed by a spherical mirror is 30 cm. The magnification is -1/3. If the focal length is x/4 cm, find the magnitude of x.

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• MCQmediumWave Motionsound wave and its general equation and velocity

  Consider sound waves travelling through ideal gases He, CH₄ and CO₂. All gases have the same value of P/ρ. The ratio VHe : VCH₄ : VCO₂ is:

  Options

  • Option A

    √(5/3) : √(4/3) : √(7/5)

  • Option B

    √(7/5) : √(5/3) : √(4/3)

  • Option C

    √(4/3) : √(5/3) : √(7/5)

  • Option D

    √(5/3) : √(4/3) : √(4/3)

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• MCQeasyUnit dimension and errorDimension and its application

  In an electromagnetic system, the ratio of electric flux to magnetic flux has dimensions MᴾLᑫTᴿAˢ. The values of Q and R are:

  Options

  • Option A

    (3, -5)

  • Option B

    (1, -1)

  • Option C

    (-2, 2)

  • Option D

    (-2, 1)

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• MCQmediumGravitationacceleration due to gravity and escape velocity

  Assertion (A): The kinetic energy needed to project a body of mass m from the Earth's surface to infinity is (1/2)mgR, where R is Earth's radius. Reason (R): The maximum gravitational potential energy of the body is zero at infinity. Choose the correct answer.

  Options

  • Option A

    Both A and R are true but R is NOT the correct explanation of A

  • Option B

    A is false but R is true

  • Option C

    A is true but R is false

  • Option D

    Both A and R are true and R is the correct explanation of A

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• MCQeasyThermodyanmicskinetic therory of gaseous

  The mean free path and average speed of oxygen molecules at 300 K and 1 atm are 3×10⁻⁷ m and 600 m/s respectively. The frequency of molecular collisions is:

  Options

  • Option A

    2×10⁹ s⁻¹

  • Option B

    9×10⁵ s⁻¹

  • Option C

    5×10⁸ s⁻¹

  • Option D

    2×10¹⁰ s⁻¹

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• IntegereasyCapacitorequivalent capacitance of circuit

  Four capacitors, each of capacitance 16 μF, are connected as shown in the original figure. Find the equivalent capacitance between points A and B in μF.

  

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• MCQeasyAtomic Structure and X-raysatomic structre and bohr atomic model

  Using the Bohr model for hydrogen-like atoms, the ratio of the radius of the 5th orbit in Li²⁺ to that in He⁺ is:

  Options

  • Option A

    4/9

  • Option B

    3/2

  • Option C

    9/4

  • Option D

    2/3

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