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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
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How to prepare for PPSC

PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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371
Physics Medium

Which model of the atom describes electrons orbiting the nucleus in specific energy levels?

  • AThomson's Plum Pudding model
  • BRutherford's model
  • CDalton's model
  • DBohr's atomic model
Permalink
Correct Answer: Option D — Bohr's atomic model
Explanation: Bohr's atomic model proposed in 1913 describes electrons orbiting the nucleus in fixed energy levels or shells and electrons emit or absorb energy when transitioning between levels.
Submitted by: PaperMCQs
372
Physics Medium

What is the name of the quantum of electromagnetic radiation?

  • AElectron
  • BNeutron
  • CProton
  • DPhoton
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Correct Answer: Option D — Photon
Explanation: A photon is the quantum or smallest discrete unit of electromagnetic radiation carrying energy proportional to its frequency as described by Planck's equation E equals hf.
Submitted by: PaperMCQs
373
Physics Medium

Who explained the photoelectric effect and won the Nobel Prize for it in 1921?

  • AAlbert Einstein
  • BMax Planck
  • CNiels Bohr
  • DErnest Rutherford
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Correct Answer: Option A — Albert Einstein
Explanation: Albert Einstein explained the photoelectric effect in 1905 by proposing that light consists of discrete packets of energy called photons and won the Nobel Prize in Physics in 1921 for this work.
Submitted by: PaperMCQs
374
Physics Hard

Which effect describes the emission of electrons from a metal surface when light of sufficient frequency falls on it?

  • ACompton effect
  • BZeeman effect
  • CPhotoelectric effect
  • DDoppler effect
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Correct Answer: Option C — Photoelectric effect
Explanation: The photoelectric effect describes the emission of electrons from a metal surface when light above a threshold frequency strikes it and was explained by Einstein winning him the Nobel Prize.
Submitted by: PaperMCQs
375
Physics Hard

Which law states that the induced EMF in a conductor is proportional to the rate of change of magnetic flux?

  • AOhm's Law
  • BCoulomb's Law
  • CAmpere's Law
  • DFaraday's Law
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Correct Answer: Option D — Faraday's Law
Explanation: Faraday's Law of Electromagnetic Induction states that the magnitude of the induced EMF equals the rate of change of magnetic flux through a circuit forming the basis of generators and transformers.
Submitted by: PaperMCQs
376
Physics Medium

Which device stores electrical energy in an electric field between two conductors?

  • AInductor
  • BResistor
  • CTransformer
  • DCapacitor
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Correct Answer: Option D — Capacitor
Explanation: A capacitor stores electrical energy in an electric field between two parallel conducting plates separated by an insulating material called a dielectric.
Submitted by: PaperMCQs
377
Physics Medium

What is the SI unit of capacitance?

  • AHenry
  • BFarad
  • CTesla
  • DOhm
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Correct Answer: Option B — Farad
Explanation: The Farad is the SI unit of capacitance named after Michael Faraday defined as the capacitance of a capacitor that stores one coulomb of charge at one volt potential difference.
Submitted by: PaperMCQs
378
Physics Medium

Which law relates the force between two electric charges to the distance between them?

  • AOhm's Law
  • BCoulomb's Law
  • CFaraday's Law
  • DAmpere's Law
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Correct Answer: Option B — Coulomb's Law
Explanation: Coulomb's Law states that the electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
Submitted by: PaperMCQs
379
Physics Medium

What is the SI unit of electric charge?

  • ACoulomb
  • BAmpere
  • CVolt
  • DFarad
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Correct Answer: Option A — Coulomb
Explanation: The Coulomb is the SI unit of electric charge defined as the quantity of electricity transported in one second by a current of one ampere.
Submitted by: PaperMCQs
380
Physics Medium

Which type of nuclear reaction combines light nuclei to form a heavier nucleus releasing energy?

  • ANuclear fusion
  • BNuclear fission
  • CRadioactive decay
  • DAlpha decay
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Correct Answer: Option A — Nuclear fusion
Explanation: Nuclear fusion combines light nuclei such as hydrogen isotopes to form heavier nuclei releasing vast amounts of energy and is the process powering the sun and hydrogen bombs.
Submitted by: PaperMCQs
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