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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

1,461 Questions
Exam Preparation Guide

How to prepare for FPSC

FPSC recruitment tests assess subject knowledge, general ability and job-related competence for federal government positions across Pakistan.

General KnowledgeCurrent AffairsEnglishJob-related Subjects
Read the official syllabus first, then combine subject-specific revision with timed mixed-question practice.
FPSC preparation illustration
621

Which microorganism is primarily responsible for fermenting milk into yogurt?

  • AYeast
  • BLactic acid bacteria
  • CMold
  • DVirus
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Correct Answer: Option B — 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
622

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 — 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
623

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 — 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
624

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 — 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
625

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 — 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
626

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 — 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
627

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 — 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.
Submitted by: PaperMCQs
628

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 — 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.
Submitted by: PaperMCQs
629

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 — 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
630

Which everyday device converts direct current into alternating current for household appliance use?

  • ATransformer
  • BInverter
  • CGenerator
  • DRectifier
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Correct Answer: Option B — Inverter
Explanation: An inverter converts direct current typically from batteries or solar panels into alternating current allowing household appliances designed for AC power to operate properly.
Submitted by: PaperMCQs