JEE Mains 2024 30 Jan Morning Shift physics questions with solutions

Showing 1–10 of 30 questions

• MCQmediumAC Circuitsseries combination of ac circuit and L-C-R circuit

  A series L,R circuit connected with an ac source E = (25 sin 1000 t) V has a power factor of 1/√2. If the source of emf is changed to E = (20 sin 2000 t)V, the new power factor of the circuit will be :

  Options

  • Option A

    1/√2

  • Option B

    1/√3

  • Option C

    1/√5

  • Option D

    1/√7

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• MCQmediumRotational Motionangular momentum in pure rotation and its conservation

  A particle of mass m projected with a velocity ‘u’ making an angle of 30º with the horizontal. The magnitude of angular momentum of the projectile about the point of projection when the particle is at its maximum height h is :

  Options

  • Option A

    √3mu³/(16g)

  • Option B

    √3mu²/(2g)

  • Option C

    $\mu$³/(√2g)

  • Option D

    zero

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• MCQmediumNewtons law of motion and Frictionconstrain motion and newton second law in constrain motion

  All surfaces shown in figure are assumed to be frictionless and the pulleys and the string are light. The acceleration of the block of mass 2 kg is :

  

  Options

  • Option A

    g

  • Option B

    g/3

  • Option C

    g/2

  • Option D

    g/4

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The electric field of an electromagnetic wave in free space is represented as $\vec{E}$= E₀ cos(ωt - kz) î. The corresponding magnetic induction vector will be :

  Options

  • Option A

    $\vec{B}$= E₀C cos(ωt - kz) ĵ

  • Option B

    $\vec{B}$ = (E₀/C) cos(ωt - kz) ĵ

  • Option C

    $\vec{B}$ = E₀C cos(ωt + kz) ĵ

  • Option D

    $\vec{B}$ = (E₀/C) cos(ωt + kz) ĵ

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• NumericmediumElectromagnetic Inductionmotional emf and induced emf in rotating rod

  A ceiling fan having 3 blades of length 80 cm each is rotating with an angular velocity of 1200 rpm. The magnetic field of earth in that region is 0.5 G and angle of dip is 30º. The emf induced across the blades is Nπ × 10⁻⁵ V. The value of N is _____ .

  Your answer

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• MCQeasyWork , Power and Energyconservation of mechanical energy

  A particle is placed at the point A of a frictionless track ABC as shown in figure. It is gently pushed toward right. The speed of the particle when it reaches the point B is : (Take g = 10 m/s²).

  

  Options

  • Option A

    20 m/s

  • Option B

    √10 m/s

  • Option C

    2√10 m/s

  • Option D

    10 m/s

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• NumericmediumGeometrical opticslens and combination lens,silvered lens

  The distance between object and its two times magnified real image as produced by a convex lens is 45 cm. The focal length of the lens used is ______ cm.

  Your answer

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• NumericeasyMagnetic effect of currentMagnetic Force on Current carrying conductor

  The horizontal component of earth’s magnetic field at a place is 3.5 × 10⁻⁵ T. A very long straight conductor carrying current of √2 A in the direction from South east to North West is placed. The force per unit length experienced by the conductor is ……… × 10⁻⁶ N/m.

  Your answer

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• NumericmediumWave Motionorgan pipe and resonance tube

  In a closed organ pipe, the frequency of fundamental note is 30 Hz. A certain amount of water is now poured in the organ pipe so that the fundamental frequency is increased to 110 Hz. If the organ pipe has a cross-sectional area of 2 cm², the amount of water poured in the organ tube is _______ g. (Take speed of sound in air is 330 m/s)

  Your answer

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• MCQeasyAtomic Structure and X-raysatomic structure and bohr atomic model

  The ratio of the magnitude of the kinetic energy to the potential energy of an electron in the 5th excited state of a hydrogen atom is :

  Options

  • Option A

    4

  • Option B

    1/4

  • Option C

    1/2

  • Option D

    1

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →