12 April 2023 physics questions with solutions

Showing 1–10 of 27 questions

• IntegermediumNuclear physicsRadioactivity & Radioactive Decay Law

  In alpha decay, ²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He + Q. Given masses 238.05060 u, 234.04360 u and 4.00260 u, and 1 u = 931.5 MeV/c². The energy released, rounded to the numerical value accepted by the source, is ______ MeV.

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  JEE Mains12 April 2023Shift 1Morning Shift

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• IntegereasyWave MotionStanding Sound Waves, Organ Pipes and Resonance Tubes

  For a closed organ pipe, the first three resonance frequencies are in the ratio 1:3:5. If the fifth harmonic is 405 Hz and the speed of sound is 324 m s⁻¹, find the length of the pipe in metres.

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• MCQeasyMagnetism and matterMagnetic Properties of Materials: Diamagnetism, Paramagnetism and Ferromagnetism

  Given below are two statements:

  Statement I: The diamagnetic property depends on temperature.

  Statement II: The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field. Choose the correct answer.

  Options

  • Option A

    Statement I is incorrect but Statement II is true

  • Option B

    Both Statement I and Statement II are true

  • Option C

    Both Statement I and Statement II are false

  • Option D

    Statement I is correct but Statement II is false

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• MCQeasyKinematics Part-1 (one dimension)Motion under gravity

  A ball is thrown vertically upward with initial speed 150 m s⁻¹. The ratio of its velocities after 3 s and 5 s is (x+1)/x. Find x. Take g = 10 m s⁻².

  Options

  • Option A

    6

  • Option B

    5

  • Option C

    -5

  • Option D

    10

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• IntegermediumGeometrical opticsLenses, Lens Combinations & Silvered Lenses

  Two convex lenses of focal length 20 cm each are coaxial and separated by 60 cm. A distant object is viewed through the combination. The final image is ______ cm from the first lens.

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• MCQeasyCurrent electricityElectric Current, Drift Velocity & Resistance

  A wire of resistance 160 Ω is melted and drawn into a wire of one-fourth its original length. The new resistance is:

  Options

  • Option A

    10 Ω

  • Option B

    640 Ω

  • Option C

    40 Ω

  • Option D

    160 Ω

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• MCQmediumPhotoelectric effect and dual natureDual Nature of Matter & de Broglie Wavelength

  A proton and an α-particle are accelerated from rest through potentials 2 V and 4 V respectively. The ratio of their de Broglie wavelengths λₚ:λₐ is:

  Options

  • Option A

    4 : 1

  • Option B

    2 : 1

  • Option C

    8 : 1

  • Option D

    16 : 1

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• MCQeasySimple Harmonic MotionKinetic Energy, Potential Energy and Conservation of Energy in SHM

  A particle executes SHM. The ratio of potential energy to kinetic energy when its displacement is half the amplitude is:

  Options

  • Option A

    1 : 1

  • Option B

    2 : 1

  • Option C

    1 : 4

  • Option D

    1 : 3

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• IntegermediumFluid MechanicsEquation of Continuity and Bernoulli's Principle

  Glycerine of density 1.25 × 10³ kg m⁻³ flows through a conical pipe. End areas are 10 cm² and 5 cm², and pressure drop is 3 N m⁻². The volume-flow rate is x × 10⁻⁵ m³ s⁻¹. Find x.

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• IntegermediumCurrent electricityElectric Current, Drift Velocity & Resistance

  The current through a conductor at 0°C and 100°C, for the same voltage source, is 2 A and 1.2 A respectively. The current at 50°C is ______ × 10² mA.

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