13 April 2023 physics questions with solutions

Showing 1–10 of 28 questions

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

  Two metals A and B have work functions 9 eV and 4.5 eV. Given hc = 1242 eV nm, the difference between their threshold wavelengths is:

  Options

  • Option A

    276 nm

  • Option B

    264 nm

  • Option C

    540 nm

  • Option D

    138 nm

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• MCQmediumCurrent electricityCells, Maximum Power & Heating Effect

  Different combinations of three identical resistors R are shown. For the same current I through each complete combination, the increasing order of power dissipation is: Image

  Options

  • Option A

    P꜀ < Pʙ < Pₐ < Pᴅ

  • Option B

    P꜀ < Pᴅ < Pₐ < Pʙ

  • Option C

    Pʙ < P꜀ < Pᴅ < Pₐ

  • Option D

    Pₐ < Pʙ < P꜀ < Pᴅ

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• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Which of the following can be a source of a time-varying magnetic field?
  A. A permanent magnet
  B. An electric field changing linearly with time
  C. Direct current
  D. A decelerating charged particle

  E. An antenna fed with a digital signal Choose the answer according to the source paper.

  Options

  • Option A

    B and D only

  • Option B

    C and E only

  • Option C

    D only

  • Option D

    A only

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• MCQeasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Which Maxwell equation is specifically required for time-varying magnetic conditions and reduces to the electrostatic form in static conditions?

  Options

  • Option A

    ∮D·dA = Q

  • Option B

    ∮E·dl = -dΦ(B)/dt

  • Option C

    ∮E·dl = 0

  • Option D

    ∮B·dl = μ₀I

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• IntegermediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  A 5 Ω shunt converts a moving-coil galvanometer into a 250 mA ammeter. When 1050 Ω is connected in series with the same galvanometer, it gives full-scale deflection at 25 V. Find the galvanometer resistance in Ω.

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• MCQeasyGravitationAcceleration Due to Gravity & Escape Velocity

  A planet has mass 9Mₑ and radius 4Rₑ. If Earth's escape speed is vₑ = 11.2 km s⁻¹, the planet's escape speed is:

  Options

  • Option A

    11.2 km s⁻¹

  • Option B

    67.2 km s⁻¹

  • Option C

    33.6 km s⁻¹

  • Option D

    16.8 km s⁻¹

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• MCQmediumKinematics part-3 Relative motionRelative motion in one dimension

  Trains A and B have lengths l and 4l and enter a tunnel of length L from opposite directions with speeds 108 km h⁻¹ and 72 km h⁻¹. Train A takes 35 s less than B to cross the tunnel. Given L = 60l, the tunnel length is:

  Options

  • Option A

    2700 m

  • Option B

    1800 m

  • Option C

    1200 m

  • Option D

    900 m

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• IntegermediumRotational Motioncombined translatory and rotatory motion ,Pure rolling motion

  A solid sphere rolls without slipping. The ratio of its angular momentum about its rotation axis to its total kinetic energy is π:22. Find its angular speed in rad s⁻¹.

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• IntegereasyAtomic Structure and X-raysatomic structure and bohr atomic model

  The radius of the second Bohr orbit of He⁺ is r₁, and the radius of the fourth orbit of Be³⁺ is r₂. If r₂/r₁ = x:1, find x.

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• IntegermediumElectrostaticelectric flux and gauss law

  An infinite charged sheet of surface density +σ and an infinite line charge of linear density +λ are parallel and separated by 5 m. Points P and Q are at perpendicular distances 3/π m and 4/π m from the line charge toward the sheet. If Eₚ/Eq = 4/a and |λ| = 2|σ|, find a.

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