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PPSC MCQs

Punjab Public Service Commission β€” 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.
PPSC preparation illustration
221

Which everyday phenomenon demonstrates the principle of capillary action in plants?

  • APhotosynthesis
  • BTranspiration
  • CWater rising through plant stems
  • DRespiration
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Correct Answer: Option C β€” Water rising through plant stems
Explanation: Capillary action allows water to rise through narrow xylem vessels in plant stems against gravity helping transport water and nutrients from roots to leaves throughout the plant.
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222

Which property of water allows insects like water striders to walk on its surface?

  • AViscosity
  • BSurface tension
  • CDensity
  • DCapillarity
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Correct Answer: Option B β€” Surface tension
Explanation: Surface tension is the cohesive force between water molecules at the surface that creates a thin elastic like layer allowing lightweight insects such as water striders to walk on water.
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223

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 β€” 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.
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224

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

  • AOxidation
  • BReduction
  • CNeutralization
  • DSublimation
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Correct Answer: Option A β€” 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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225

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 β€” 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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226

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 β€” 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.
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227

Which natural disaster is measured using the Richter scale?

  • AHurricanes
  • BEarthquakes
  • CFloods
  • DTornadoes
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Correct Answer: Option B β€” 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.
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228

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 β€” 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.
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229

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 β€” 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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230

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 β€” 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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