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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

273 Questions
Exam Preparation Guide

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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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
71
Everyday Science Medium

Which phenomenon explains why a straw placed in a drink allows liquid to be sucked upward?

  • AGravity pulling liquid
  • BMagnetic force
  • CAtmospheric pressure pushing liquid up
  • DSurface tension alone
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Correct Answer: Option C — Atmospheric pressure pushing liquid up
Explanation: When you suck on a straw you reduce air pressure inside it and the greater atmospheric pressure outside pushes the liquid upward into your mouth.
Submitted by: PaperMCQs
72
Everyday Science Easy

Which vitamin is produced when ultraviolet light acts on cholesterol in the skin?

  • AVitamin A
  • BVitamin E
  • CVitamin K
  • DVitamin D
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Correct Answer: Option D — Vitamin D
Explanation: Vitamin D is synthesised in the skin when UV-B radiation converts a form of cholesterol into Vitamin D3 which is then processed by the liver and kidneys.
Submitted by: PaperMCQs
73
Everyday Science Easy

Which everyday process is used when a doctor listens to heartbeats through a stethoscope?

  • ARefraction of sound
  • BConduction of sound
  • CAmplification of light
  • DReflection of light
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Correct Answer: Option B — Conduction of sound
Explanation: A stethoscope conducts sound from the chest through the tube to the earpieces amplifying the otherwise faint sounds of heartbeats and breathing.
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74
Everyday Science Medium

Which gas is used to fill incandescent light bulb to prevent the filament from burning?

  • AOxygen
  • BCarbon dioxide
  • CArgon or nitrogen
  • DHelium
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Correct Answer: Option C — Argon or nitrogen
Explanation: Incandescent bulbs are filled with argon or nitrogen to prevent the tungsten filament from oxidising and burning out quickly extending the bulb's lifespan.
Submitted by: PaperMCQs
75
Everyday Science Medium

Which phenomenon causes a needle to deflect when placed near a current-carrying wire?

  • AMagnetism
  • BGravity
  • CStatic electricity
  • DSound waves
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Correct Answer: Option A — Magnetism
Explanation: A current-carrying wire produces a magnetic field around it which deflects a nearby compass needle demonstrating the link between electricity and magnetism.
Submitted by: PaperMCQs
76
Everyday Science Medium

Which everyday material is used as an X-ray absorber to protect the body during medical scans?

  • ACopper
  • BLead
  • CAluminium
  • DSteel
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Correct Answer: Option B — Lead
Explanation: Lead is used as a shield during X-ray procedures because it effectively absorbs harmful ionising radiation protecting body parts not being examined.
Submitted by: PaperMCQs
77
Everyday Science Easy

Which sense organ contains the olfactory receptors responsible for detecting smells?

  • AEars
  • BEyes
  • CNose
  • DTongue
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Correct Answer: Option C — Nose
Explanation: The nose contains olfactory receptors located in the nasal cavity that detect chemical molecules in the air and transmit smell information to the brain.
Submitted by: PaperMCQs
78
Everyday Science Easy

Which common substance has the chemical formula H2O2?

  • AWater
  • BAcetic acid
  • CHydrogen peroxide
  • DAmmonia
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Correct Answer: Option C — Hydrogen peroxide
Explanation: Hydrogen peroxide H2O2 is a common antiseptic used to clean wounds and is also used as a bleaching agent and differs from water by having an extra oxygen atom.
Submitted by: PaperMCQs
79
Everyday Science Hard

Which layer of the skin provides insulation and stores energy as fat?

  • AMelanocyte layer
  • BEpidermis
  • CDermis
  • DHypodermis
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Correct Answer: Option A — Melanocyte layer
Explanation: The hypodermis also called subcutaneous tissue is the deepest skin layer that stores fat for insulation energy reserve and cushioning against physical impact.
Submitted by: PaperMCQs
80
Everyday Science Medium

Which everyday process converts mechanical energy into electrical energy in a bicycle dynamo?

  • ARadiation
  • BConduction
  • CElectromagnetic induction
  • DChemical reaction
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Correct Answer: Option C — Electromagnetic induction
Explanation: A bicycle dynamo converts mechanical energy from wheel rotation into electrical energy through electromagnetic induction as a coil rotates within a magnetic field.
Submitted by: PaperMCQs
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