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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

86 Questions
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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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51
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
Permalink
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
52
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
53
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
54
Physics Medium

Which type of nuclear reaction splits a heavy nucleus into smaller nuclei releasing large amounts of energy?

  • ANuclear fusion
  • BRadioactive decay
  • CNuclear fission
  • DBeta decay
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Correct Answer: Option C — Nuclear fission
Explanation: Nuclear fission splits a heavy nucleus such as uranium-235 into smaller nuclei releasing enormous amounts of energy and is the principle behind nuclear power plants and atomic bombs.
Submitted by: PaperMCQs
55
Physics Medium

What is the process by which an unstable atomic nucleus spontaneously emits radiation?

  • AFission
  • BFusion
  • CDiffraction
  • DRadioactive decay
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Correct Answer: Option D — Radioactive decay
Explanation: Radioactive decay is the spontaneous emission of radiation from an unstable atomic nucleus as it transforms into a more stable configuration releasing alpha beta or gamma radiation.
Submitted by: PaperMCQs
56
Physics Easy

Which particle in an atom has no electric charge?

  • AProton
  • BElectron
  • CNeutron
  • DPhoton
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Correct Answer: Option C — Neutron
Explanation: Neutrons are electrically neutral subatomic particles found in the nucleus of an atom alongside protons and their presence affects the mass and stability of the nucleus.
Submitted by: PaperMCQs
57
Physics Easy

Which particle carries a positive electric charge in an atom?

  • AElectron
  • BNeutron
  • CProton
  • DPhoton
Permalink
Correct Answer: Option C — Proton
Explanation: Protons are positively charged subatomic particles located in the nucleus of an atom with a charge equal in magnitude but opposite in sign to that of an electron.
Submitted by: PaperMCQs
58
Physics Easy

Which particle carries a negative electric charge in an atom?

  • AProton
  • BElectron
  • CNeutron
  • DNucleus
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Correct Answer: Option B — Electron
Explanation: Electrons are subatomic particles carrying a negative electric charge of 1.6 x 10 to the power of minus 19 coulombs and orbit the nucleus of an atom.
Submitted by: PaperMCQs
59
Physics Hard

Which phenomenon explains the formation of mirages in deserts?

  • AReflection of light
  • BDiffraction of light
  • CTotal internal reflection due to air density layers
  • DDispersion of light
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Correct Answer: Option C — Total internal reflection due to air density layers
Explanation: Mirages form due to total internal reflection when light rays from the sky refract through layers of air with varying temperature and density creating the illusion of water on the ground.
Submitted by: PaperMCQs
60
Physics Hard

What is the angle of incidence when a ray of light undergoes total internal reflection?

  • ALess than the critical angle
  • BEqual to 90 degrees
  • CGreater than the critical angle
  • DEqual to 45 degrees
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Correct Answer: Option C — Greater than the critical angle
Explanation: Total internal reflection occurs when light travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle causing all light to be reflected back.
Submitted by: PaperMCQs
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