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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 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
571
Everyday Science Medium

Which gas makes up approximately 0.04 percent of Earth's atmosphere and is essential for plant photosynthesis?

  • AOxygen
  • BCarbon dioxide
  • CNitrogen
  • DArgon
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Correct Answer: Option B — Carbon dioxide
Explanation: Carbon dioxide makes up about 0.04 percent of Earth's atmosphere and despite its small concentration it is essential for photosynthesis and plays a major role in climate regulation.
Submitted by: PaperMCQs
572
Everyday Science Medium

Which scale measures the hardness of minerals, with diamond being the hardest at 10?

  • ARichter scale
  • BMohs scale
  • CBeaufort scale
  • DKelvin scale
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Correct Answer: Option B — Mohs scale
Explanation: The Mohs hardness scale ranks minerals from 1 to 10 based on their ability to scratch each other with diamond rated at 10 as the hardest naturally occurring mineral.
Submitted by: PaperMCQs
573
Everyday Science Medium

Which common household item works based on the principle of Pascal's law?

  • AKnife
  • BThermometer
  • CHydraulic jack
  • DBarometer
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Correct Answer: Option C — Hydraulic jack
Explanation: A hydraulic jack uses Pascal's law where pressure applied to a confined fluid is transmitted equally in all directions allowing a small force to lift heavy loads.
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574
Everyday Science Medium

Which gas is released when metals like zinc react with dilute hydrochloric acid?

  • AOxygen
  • BCarbon dioxide
  • CHydrogen
  • DNitrogen
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Correct Answer: Option C — Hydrogen
Explanation: When zinc reacts with dilute hydrochloric acid hydrogen gas is produced along with zinc chloride and this reaction is a standard laboratory method to generate hydrogen.
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575
Everyday Science Easy

Which everyday observation shows that hot air rises and cool air sinks creating circulation?

  • ABoiling water forming convection currents
  • BIce melting in sunlight
  • CMetal expanding when heated
  • DSound echoing in a hall
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Correct Answer: Option A — Boiling water forming convection currents
Explanation: Boiling water shows convection currents as hot less-dense water rises to the surface while cooler denser water sinks demonstrating natural thermal circulation.
Submitted by: PaperMCQs
576
Everyday Science Medium

Which process allows a submarine to sink or rise by adjusting water in ballast tanks?

  • AChanging buoyancy through water displacement
  • BEvaporation
  • COsmosis
  • DThermal expansion
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Correct Answer: Option A — Changing buoyancy through water displacement
Explanation: Submarines control their depth by filling or emptying ballast tanks with water to change their overall density relative to the surrounding water adjusting buoyancy.
Submitted by: PaperMCQs
577
Everyday Science Medium

Which common ailment is caused by the Helicobacter pylori bacterium?

  • ACommon cold
  • BStomach ulcers
  • CMalaria
  • DChickenpox
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Correct Answer: Option B — Stomach ulcers
Explanation: Helicobacter pylori is a bacterium that infects the stomach lining causing inflammation that can lead to peptic ulcers and is treatable with antibiotics.
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578
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.
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579
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
580
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.
Submitted by: PaperMCQs
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