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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

1,458 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.
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751

Which gas is responsible for the characteristic smell often associated with rain after a dry spell?

  • AMethane
  • BOzone
  • CPetrichor compounds
  • DSulfur dioxide
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Correct Answer: Option C — Petrichor compounds
Explanation: The distinctive earthy smell after rain known as petrichor is caused by plant oils geosmin released by soil bacteria and ozone combining in the air during rainfall.
Submitted by: PaperMCQs
752

Which everyday chemical reaction is responsible for rusting of iron objects?

  • AOxidation
  • BReduction
  • CNeutralization
  • DSublimation
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Correct Answer: Option A — Oxidation
Explanation: Rusting is an oxidation reaction where iron reacts with oxygen and moisture in the air forming iron oxide which weakens and corrodes metal structures over time.
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753

Which scale is used to estimate wind speed based on observed sea or land conditions without instruments?

  • ARichter scale
  • BBeaufort scale
  • CFujita scale
  • DSaffir-Simpson scale
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Correct Answer: Option B — Beaufort scale
Explanation: The Beaufort scale estimates wind speed by observing its effects on sea waves and land conditions providing a practical method for assessing wind force without specialized instruments.
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754

Which scale is commonly used to measure the intensity of hurricanes and tropical cyclones?

  • ARichter scale
  • BSaffir-Simpson scale
  • CBeaufort scale
  • DFujita scale
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Correct Answer: Option B — Saffir-Simpson scale
Explanation: The Saffir-Simpson scale categorizes hurricanes into five categories based on sustained wind speed helping predict potential damage and guide disaster preparedness measures.
Submitted by: PaperMCQs
755

Which natural disaster is measured using the Richter scale?

  • AHurricanes
  • BEarthquakes
  • CFloods
  • DTornadoes
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Correct Answer: Option B — Earthquakes
Explanation: The Richter scale is used to measure the magnitude of earthquakes based on the amplitude of seismic waves recorded by seismographs at monitoring stations.
Submitted by: PaperMCQs
756

Which water purification process removes dissolved salts and impurities by forcing water through a semi-permeable membrane?

  • AChlorination
  • BReverse osmosis
  • CBoiling
  • DUV purification
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Correct Answer: Option B — Reverse osmosis
Explanation: Reverse osmosis forces water through a semi-permeable membrane under pressure removing dissolved salts and impurities producing cleaner and safer drinking water.
Submitted by: PaperMCQs
757

Which household water purification method uses ultraviolet light to kill bacteria and viruses?

  • AReverse osmosis
  • BUV purification
  • CBoiling
  • DChlorination
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Correct Answer: Option B — UV purification
Explanation: UV purification systems use ultraviolet light to destroy the DNA of bacteria viruses and other pathogens in water making it safe for drinking without altering its taste.
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758

Which preservation technique uses controlled heating to kill harmful microorganisms in liquids like milk?

  • ADehydration
  • BPasteurization
  • CFermentation
  • DCanning
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Correct Answer: Option B — Pasteurization
Explanation: Pasteurization involves heating liquids like milk to a specific temperature for a set time to kill harmful microorganisms while preserving nutritional quality and extending shelf life.
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759

Which common food preservation method works by removing moisture to inhibit bacterial growth?

  • ARefrigeration
  • BDehydration
  • CPasteurization
  • DFreezing
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Correct Answer: Option B — Dehydration
Explanation: Dehydration preserves food by removing moisture content which inhibits the growth of bacteria fungi and other microorganisms that require water to survive and multiply.
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760

Which instrument is used to detect and measure the magnitude of earthquakes?

  • ABarometer
  • BSeismograph
  • CAnemometer
  • DHygrometer
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Correct Answer: Option B — Seismograph
Explanation: A seismograph detects and records ground vibrations allowing scientists to measure the magnitude and epicenter of earthquakes for disaster monitoring and early warning systems.
Submitted by: PaperMCQs