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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
781

Which renewable energy source uses moving air currents to generate electricity through turbines?

  • ASolar energy
  • BWind energy
  • CHydropower
  • DBiomass energy
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Correct Answer: Option B β€” Wind energy
Explanation: Wind energy uses moving air currents to rotate large turbine blades which drive generators to produce electricity offering a clean and increasingly cost effective renewable power source.
Submitted by: PaperMCQs
782

Which renewable energy source harnesses sunlight directly to generate electricity?

  • AWind energy
  • BSolar energy
  • CHydropower
  • DGeothermal energy
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Correct Answer: Option B β€” Solar energy
Explanation: Solar energy harnesses sunlight directly using photovoltaic cells to generate electricity providing a clean and renewable alternative to fossil fuel based power generation.
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783

Which gas commonly used in refrigerators and air conditioners was historically linked to ozone layer depletion?

  • ACarbon dioxide
  • BChlorofluorocarbons
  • CMethane
  • DNitrogen
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Correct Answer: Option B β€” Chlorofluorocarbons
Explanation: Chlorofluorocarbons CFCs once widely used as refrigerants were linked to ozone layer depletion as they release chlorine atoms that break down ozone molecules in the stratosphere.
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784

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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785

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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786

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.
Submitted by: PaperMCQs
787

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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788

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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789

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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790

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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