JEE Mains 2024 09 Apr Morning Shift physics questions with solutions

Showing 1–10 of 30 questions

• MCQeasyUnits, Dimensions, Measurements and ErrorsVernier Calipers and Screw Gauge: Measurement and Errors

  One main scale division of a vernier caliper is equal to m units. If nth division of main scale coincides with (n + 1)th division of vernier scale, the least count of the vernier caliper is:

  Options

  • Option A

    n/(n + 1)

  • Option B

    m/(n + 1)

  • Option C

    1/(n + 1)

  • Option D

    m/[n(n + 1)]

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• NumericmediumNuclear physicsNuclear Fission, Fusion & Nuclear Reactors

  A star has 100% helium composition. It starts to convert three ⁴He into one ¹²C via triple alpha process as

  ⁴He + ⁴He + ⁴He → ¹²C + Q.

  The mass of the star is 2.0 × 10³² kg and it generates energy at the rate of 5.808 × 10³⁰ W. The rate of converting these ⁴He to ¹²C is n × 10⁴² s⁻¹, where n is _______.

  [Take, mass of ⁴He = 4.0026 u, mass of ¹²C = 12 u]

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• NumericmediumWave OpticsYoung's Double-Slit Experiment (YDSE)

  In a Young's double slit experiment, the intensity at a point is 1/4th of the maximum intensity, the minimum distance of the point from the central maximum is ________ μm. (Given: λ = 600 nm, d = 1.0 mm, D = 1.0 m)

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• MCQeasyAC CircuitsSeries AC Circuits: Impedance, Phase Difference, Resonance and Power Factor

  A bulb and a capacitor are connected in series across an ac supply. A dielectric is then placed between the plates of the capacitor. The glow of the bulb:

  Options

  • Option A

    increases

  • Option B

    remains same

  • Option C

    becomes zero

  • Option D

    decreases

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• MCQeasyNewtons law of motion and FrictionPulley Systems & Applications

  A light unstretchable string passing over a smooth light pulley connects two blocks of masses m₁ and m₂. If the acceleration of the system is g/8, then the ratio of the masses m₂/m₁ is:

  Options

  • Option A

    9 : 7

  • Option B

    4 : 3

  • Option C

    5 : 3

  • Option D

    8 : 1

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• MCQmediumThermodynamicsThermodynamic Processes, P-V Diagrams and Work Done

  The volume of an ideal gas (γ = 1.5) is changed adiabatically from 5 litres to 4 litres. The ratio of initial pressure to final pressure is:

  Options

  • Option A

    4/5

  • Option B

    16/25

  • Option C

    8/(5√5)

  • Option D

    2/5

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• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  A plane EM wave is propagating along x direction. It has a wavelength of 4 mm. If electric field is in y direction with the maximum magnitude of 60 V m⁻¹, the equation for magnetic field is:

  Options

  • Option A

    B(z) = 60 sin[(π/2)(x - 3 × 10⁸t)] k̂ T

  • Option B

    B(z) = 2 × 10⁻⁷ sin[(π/2) × 10³(x - 3 × 10⁸t)] k̂ T

  • Option C

    B(x) = 60 sin[(π/2)(x - 3 × 10⁸t)] î T

  • Option D

    B(z) = 2 × 10⁻⁷ sin[(π/2)(x - 3 × 10⁸t)] k̂ T

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• MCQmediumMagnetic effect of currentAmpere's Circuital Law and Its Applications

  Given below are two statements:

  Statement (I): When currents vary with time, Newton's third law is valid only if momentum carried by the electromagnetic field is taken into account.

  Statement (II): Ampere's circuital law does not depend on Biot-Savart's law.

  In the light of the above statements, choose the correct answer from the options given below:

  Options

  • Option A

    Both Statement I and Statement II are false.

  • Option B

    Statement I is true but Statement II is false.

  • Option C

    Statement I is false but Statement II is true.

  • Option D

    Both Statement I and Statement II are true.

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• NumericmediumAC CircuitsSeries AC Circuits: Impedance, Phase Difference, Resonance and Power Factor

  When a coil is connected across a 20 V dc supply, it draws a current of 5 A. When it is connected across 20 V, 50 Hz ac supply, it draws a current of 4 A. The self inductance of the coil is ______ mH. (Take π = 3)

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• NumericmediumCurrent electricityCircuit Theory & Kirchhoff’s Laws

  The current flowing through the 1 Ω resistor is n/10 A. The value of n is ________.

  

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