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PPSC MCQs

Punjab Public Service Commission β€” Complete MCQ Bank

1,259 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.
PPSC preparation illustration
651

Which microorganism is primarily responsible for fermenting sugars into alcohol in brewing and winemaking?

  • ABacteria
  • BYeast
  • CAlgae
  • DProtozoa
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Correct Answer: Option B β€” Yeast
Explanation: Yeast ferments sugars into alcohol and carbon dioxide through anaerobic respiration making it essential for brewing beer producing wine and baking bread.
Submitted by: PaperMCQs
652

Which microorganism is primarily responsible for fermenting milk into yogurt?

  • AYeast
  • BLactic acid bacteria
  • CMold
  • DVirus
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Correct Answer: Option B β€” Lactic acid bacteria
Explanation: Lactic acid bacteria ferment lactose in milk into lactic acid which thickens the milk and gives yogurt its characteristic tangy flavor and creamy texture.
Submitted by: PaperMCQs
653

Which gas produced during fermentation causes dough to rise when making bread?

  • AOxygen
  • BCarbon dioxide
  • CNitrogen
  • DHydrogen
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Correct Answer: Option B β€” Carbon dioxide
Explanation: Carbon dioxide gas produced by yeast during fermentation causes bread dough to rise creating the light airy texture characteristic of well baked bread products.
Submitted by: PaperMCQs
654

Which everyday material is commonly used as a natural disinfectant due to its antimicrobial properties?

  • ASugar
  • BHoney
  • CSalt water alone
  • DCooking oil
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Correct Answer: Option B β€” Honey
Explanation: Honey has natural antimicrobial properties due to its low moisture content and acidic pH making it effective as a natural disinfectant and wound healing aid in traditional medicine.
Submitted by: PaperMCQs
655

Which everyday process explains why water boils at a lower temperature at high altitudes such as on mountains?

  • ALower atmospheric pressure
  • BHigher atmospheric pressure
  • CIncreased oxygen levels
  • DReduced gravity
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Correct Answer: Option A β€” Lower atmospheric pressure
Explanation: At high altitudes atmospheric pressure is lower which reduces the boiling point of water meaning it boils at a temperature below 100 degrees Celsius found at sea level.
Submitted by: PaperMCQs
656

Which everyday process explains why food cooks faster in a pressure cooker compared to an open pot?

  • ALower boiling point at high pressure
  • BHigher boiling point at high pressure
  • CReduced heat transfer
  • DIncreased oxygen levels
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Correct Answer: Option B β€” Higher boiling point at high pressure
Explanation: A pressure cooker raises internal pressure which increases the boiling point of water allowing food to cook faster at higher temperatures than would be possible in an open pot.
Submitted by: PaperMCQs
657

Which optical phenomenon creates the illusion of water on a hot road surface during sunny days?

  • ARainbow
  • BMirage
  • CAurora
  • DHalo
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Correct Answer: Option B β€” Mirage
Explanation: A mirage is an optical phenomenon caused by the bending of light through layers of air with varying temperatures creating the illusion of water on hot road surfaces during sunny days.
Submitted by: PaperMCQs
658

Which natural phenomenon produces colorful displays of light in polar regions due to solar particles interacting with the atmosphere?

  • ARainbow
  • BAurora
  • CHalo
  • DMirage
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Correct Answer: Option B β€” Aurora
Explanation: Auroras occur when charged particles from the sun interact with gases in Earth's upper atmosphere near the poles producing colorful displays of light known as the northern or southern lights.
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659

Which natural phenomenon explains why a compass needle always points toward magnetic north?

  • AEarth's magnetic field
  • BEarth's gravitational field
  • CEarth's rotation
  • DSolar wind
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Correct Answer: Option A β€” Earth's magnetic field
Explanation: Earth's magnetic field generated by molten iron movement in its core causes a compass needle to align itself and point toward magnetic north providing a reliable navigation tool.
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660

Which everyday device converts alternating current into direct current for charging electronic devices?

  • AInverter
  • BRectifier
  • CTransformer
  • DGenerator
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Correct Answer: Option B β€” Rectifier
Explanation: A rectifier converts alternating current into direct current and is commonly found inside chargers for electronic devices that require stable DC power for proper operation.
Submitted by: PaperMCQs