JEE Mains 2025 29 Jan Morning Shift physics questions with solutions

Showing 1–10 of 21 questions

• MCQmediumUnit dimension and errorDimension and its application

  The velocity of a particle moving on a straight line varies as v=At²+Bt/(C+t), where A, B and C are constants. The dimensions of ABC are:

  Options

  • Option A

    L²T⁻²

  • Option B

    L²T⁻¹

  • Option C

    L²T⁻³

  • Option D

    LT⁻³

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

  If the radius of the first Bohr orbit of hydrogen is a₀, the radius of the second Bohr orbit is:

  Options

  • Option A

    8a₀

  • Option B

    4a₀

  • Option C

    2a₀

  • Option D

    6πa₀

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• MCQeasySimple Harmonic Motionangular shm and its time period

  Assertion: At the peak of a mountain, the time period of a pendulum increases. Reason: The time period of a pendulum increases when g decreases.

  Options

  • Option A

    Assertion is correct, Reason is incorrect

  • Option B

    Assertion is incorrect, Reason is correct

  • Option C

    Assertion is incorrect, Reason is incorrect

  • Option D

    Assertion is correct, Reason is correct

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• MCQmediumCenter of maas , Momentum and Collisioncollision and types of collision

  A pendulum bob of mass m/2 is released from rest from the position shown, at 60° from the vertical, and collides elastically (e=1) with a stationary bob of mass m. Find the speed of the mass m immediately after collision.

  

  Options

  • Option A

    √(3gl/2)

  • Option B

    (2/3)√(gl)

  • Option C

    √(gl/3)

  • Option D

    (1/3)√(gl)

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• MCQeasyKinematics part-3 Relative motionRiver problem

  A river flows at 9 km/h. A boat moves downstream with speed 27 km/h relative to water. A person in the boat throws a ball vertically upward at 10 m/s. Find the horizontal range of the ball as seen by an observer on the bank. Take g=10 m/s².

  Options

  • Option A

    10 m

  • Option B

    20 m

  • Option C

    25 m

  • Option D

    20√3 m

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• MCQmediumElectrostaticelectric dipole and dipole moment

  An electric dipole of dipole moment P and moment of inertia I is placed with $\vec{p}$ parallel to a uniform electric field $\vec{E}$. It is rotated slightly and released. The time period of small oscillation is:

  Options

  • Option A

    2π√(I/PE)

  • Option B

    (1/2π)√(PE/I)

  • Option C

    2π√(IE/P)

  • Option D

    (1/2π)√(PI/E)

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Statement-1: Electromagnetic waves have both energy and momentum. Statement-2: Rest mass of a photon is zero.

  Options

  • Option A

    Both statements are correct

  • Option B

    Statement-1 correct, Statement-2 incorrect

  • Option C

    Statement-1 incorrect, Statement-2 correct

  • Option D

    Both statements are incorrect

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• MCQmediumMagnetic effect of currentampere's law and its application

  An infinite solid cylindrical wire of radius R carries current I uniformly over its cross-section. At what distance from the centre is the magnetic field equal to μ₀I/(4πR)?

  

  Options

  • Option A

    R/2

  • Option B

    R

  • Option C

    4R

  • Option D

    0

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• MCQeasyUnit dimension and errorDimension and its application

  Which pair of physical quantities has the same dimensions?

  Options

  • Option A

    Angular momentum and Planck's constant

  • Option B

    Torque and moment of inertia

  • Option C

    Impulse and surface tension

  • Option D

    Momentum and work done

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• IntegermediumRotational Motiontorque and rotational equilibrium

  A force $\vec{F}$=î-ĵ+k̂ acts at the point (1,1,1). Find the magnitude of the z-component of torque about the origin.

  Your answer

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