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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
201

Which scientist is credited with developing the theory of evolution by natural selection?

  • AGregor Mendel
  • BCharles Darwin
  • CLouis Pasteur
  • DRobert Hooke
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Correct Answer: Option B β€” Charles Darwin
Explanation: Charles Darwin developed the theory of evolution by natural selection explaining how species change over generations through differential survival and reproduction based on inherited traits.
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202

Which common antibiotic was first discovered from a mold by Alexander Fleming?

  • ATetracycline
  • BPenicillin
  • CAmoxicillin
  • DStreptomycin
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Correct Answer: Option B β€” Penicillin
Explanation: Penicillin was first discovered by Alexander Fleming from the mold Penicillium notatum marking a major breakthrough in medicine that revolutionized the treatment of bacterial infections.
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203

Which type of cell division produces gametes with half the chromosome number for sexual reproduction?

  • AMitosis
  • BMeiosis
  • CBinary fission
  • DBudding
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Correct Answer: Option B β€” Meiosis
Explanation: Meiosis is the type of cell division that produces gametes with half the normal chromosome number ensuring genetic diversity during sexual reproduction in organisms.
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204

Which type of cell division produces two genetically identical daughter cells for growth and repair?

  • AMeiosis
  • BMitosis
  • CBinary fission
  • DBudding
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Correct Answer: Option B β€” Mitosis
Explanation: Mitosis is the type of cell division that produces two genetically identical daughter cells supporting growth tissue repair and the replacement of damaged or aging cells.
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205

Which biological process allows water to move across a cell membrane from a region of low solute concentration to high concentration?

  • ADiffusion
  • BOsmosis
  • CActive transport
  • DFiltration
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Correct Answer: Option B β€” Osmosis
Explanation: Osmosis is the movement of water molecules across a semi-permeable membrane from an area of low solute concentration to high concentration helping maintain cellular water balance.
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206

Which process allows plants to release excess water vapor through small pores in their leaves?

  • APhotosynthesis
  • BRespiration
  • CTranspiration
  • DOsmosis
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Correct Answer: Option C β€” Transpiration
Explanation: Transpiration is the process by which plants release excess water vapor through small pores called stomata on their leaves helping regulate temperature and nutrient transport.
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207

Which common household chemical reaction produces a foaming effect often used in classroom volcano experiments?

  • ABaking soda and vinegar reaction
  • BSalt dissolving in water
  • CSugar caramelizing
  • DIce melting
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Correct Answer: Option A β€” Baking soda and vinegar reaction
Explanation: The baking soda and vinegar reaction produces carbon dioxide gas creating a foaming eruption effect commonly used in classroom volcano demonstrations to illustrate acid base chemistry.
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208

Which gas is primarily responsible for causing the bends in deep sea divers who ascend too quickly?

  • AOxygen
  • BNitrogen
  • CCarbon dioxide
  • DHelium
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Correct Answer: Option B β€” Nitrogen
Explanation: Nitrogen dissolved in the bloodstream under high pressure can form bubbles if a diver ascends too quickly causing decompression sickness commonly known as the bends.
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209

Which common kitchen ingredient is used as a natural indicator to test acidity or basicity in simple science experiments?

  • ARed cabbage extract
  • BTable salt
  • CSugar
  • DCooking oil
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Correct Answer: Option A β€” Red cabbage extract
Explanation: Red cabbage extract contains a natural pigment called anthocyanin that changes color depending on pH making it a popular natural indicator for testing acidity or basicity at home.
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210

Which common everyday substance is classified as a strong acid frequently used in car batteries?

  • AAcetic acid
  • BSulfuric acid
  • CCitric acid
  • DCarbonic acid
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Correct Answer: Option B β€” Sulfuric acid
Explanation: Sulfuric acid is a strong acid commonly used as the electrolyte in lead acid car batteries enabling the chemical reactions necessary for storing and releasing electrical energy.
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