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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
171

Which everyday phenomenon explains why a wet cloth dries faster on a windy day compared to a calm day?

  • AIncreased evaporation due to air movement
  • BDecreased evaporation due to air movement
  • CIncreased condensation
  • DSublimation effect
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Correct Answer: Option A β€” Increased evaporation due to air movement
Explanation: Wind increases evaporation by continuously removing the saturated air layer near the wet cloth surface allowing more water molecules to escape into the atmosphere causing faster drying.
Submitted by: PaperMCQs
172

Which everyday biological process allows the human body to maintain a stable internal environment despite external changes?

  • AMetabolism
  • BHomeostasis
  • COsmosis
  • DRespiration
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Correct Answer: Option B β€” Homeostasis
Explanation: Homeostasis is the process by which the human body maintains a stable internal environment such as temperature and pH despite changes in the external surroundings.
Submitted by: PaperMCQs
173

Which everyday material is commonly used to absorb excess moisture in packaged goods to prevent spoilage?

  • ASilica gel
  • BTable salt
  • CBaking soda
  • DCotton
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Correct Answer: Option A β€” Silica gel
Explanation: Silica gel packets are commonly placed in packaged goods to absorb excess moisture preventing mold growth and preserving the quality of products like electronics and dried foods.
Submitted by: PaperMCQs
174

Which everyday chemical process explains why sliced apples turn brown after being exposed to air?

  • AReduction reaction
  • BOxidation reaction
  • CNeutralization reaction
  • DSublimation
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Correct Answer: Option B β€” Oxidation reaction
Explanation: Sliced apples turn brown due to an oxidation reaction where enzymes react with oxygen in the air converting certain compounds into brown colored substances on the cut surface.
Submitted by: PaperMCQs
175

Which everyday device uses a small magnifying lens system to examine tiny objects not visible to the naked eye?

  • ATelescope
  • BMicroscope
  • CPeriscope
  • DBinoculars
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Correct Answer: Option B β€” Microscope
Explanation: A microscope uses a system of lenses to magnify tiny objects such as cells and microorganisms allowing detailed observation that is impossible with the naked eye alone.
Submitted by: PaperMCQs
176

Which everyday optical device uses a combination of lenses to magnify distant objects?

  • AMicroscope
  • BTelescope
  • CPeriscope
  • DStethoscope
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Correct Answer: Option B β€” Telescope
Explanation: A telescope uses a combination of lenses or mirrors to collect and magnify light from distant objects making them appear closer and clearer to the observer.
Submitted by: PaperMCQs
177

Which household practice helps prevent the growth of mold in damp areas like bathrooms?

  • AIncreasing humidity
  • BProper ventilation
  • CClosing all windows
  • DReducing sunlight exposure
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Correct Answer: Option B β€” Proper ventilation
Explanation: Proper ventilation reduces moisture buildup in damp areas like bathrooms preventing the conditions mold spores need to grow and spread across surfaces.
Submitted by: PaperMCQs
178

Which property of sound determines how high or low it is perceived by the human ear?

  • AAmplitude
  • BFrequency
  • CWavelength
  • DSpeed
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Correct Answer: Option B β€” Frequency
Explanation: Frequency determines the pitch of sound with higher frequencies perceived as higher pitched tones and lower frequencies perceived as deeper sounds by the human ear.
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179

Which gas makes up the highest percentage of exhaled human breath besides nitrogen?

  • AOxygen
  • BCarbon dioxide
  • CHydrogen
  • DHelium
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Correct Answer: Option B β€” Carbon dioxide
Explanation: Exhaled human breath contains a higher concentration of carbon dioxide than inhaled air because cellular respiration produces carbon dioxide as a metabolic waste product that the lungs expel.
Submitted by: PaperMCQs
180

Which type of immunity is passed from mother to infant through breast milk or placental transfer?

  • AActive immunity
  • BPassive immunity
  • CInnate immunity
  • DAcquired immunity through vaccination
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Correct Answer: Option B β€” Passive immunity
Explanation: Passive immunity is passed from mother to infant through breast milk or placental transfer providing temporary protection against infections during the early stages of an infant's life.
Submitted by: PaperMCQs