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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 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.
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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
141
Biology Medium

Which type of RNA brings amino acids to the ribosome during protein synthesis?

  • AmRNA
  • BrRNA
  • CtRNA
  • DsnRNA
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Correct Answer: Option C — tRNA
Explanation: Transfer RNA or tRNA is responsible for bringing specific amino acids to the ribosome during translation each tRNA has an anticodon that matches a codon on the mRNA.
Submitted by: PaperMCQs
142
Biology Medium

What happens to enzyme activity when temperature rises significantly above its optimum?

  • AActivity slows gradually then speeds up
  • BActivity remains constant
  • CEnzyme is denatured and loses activity
  • DEnzyme replicates to compensate
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Correct Answer: Option C — Enzyme is denatured and loses activity
Explanation: When temperature rises significantly above the optimum the enzyme is denatured meaning the active site changes shape so the substrate can no longer bind and activity is permanently lost.
Submitted by: PaperMCQs
143
Biology Medium

What term describes the specific molecule an enzyme acts upon?

  • ASubstrate
  • BProduct
  • CCofactor
  • DCoenzyme
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Correct Answer: Option A — Substrate
Explanation: The substrate is the specific molecule upon which an enzyme acts binding at the active site to form an enzyme-substrate complex and being converted into products.
Submitted by: PaperMCQs
144
Biology Medium

What is the role of enzymes in biological reactions?

  • AAct as biological catalysts to speed up reactions
  • BStore genetic information
  • CProvide energy for reactions
  • DTransport oxygen in blood
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Correct Answer: Option A — Act as biological catalysts to speed up reactions
Explanation: Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering activation energy without being consumed or permanently altered in the process.
Submitted by: PaperMCQs
145
Biology Easy

Which type of disease is caused by a pathogen and can be transmitted from one person to another?

  • ADeficiency disease
  • BCommunicable disease
  • CGenetic disease
  • DDegenerative disease
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Correct Answer: Option B — Communicable disease
Explanation: Communicable diseases are caused by pathogens such as bacteria viruses fungi or parasites and can be transmitted directly or indirectly from one person to another.
Submitted by: PaperMCQs
146
Biology Easy

Which type of disease is caused by a deficiency of essential nutrients in the diet?

  • ACommunicable disease
  • BHereditary disease
  • CAutoimmune disease
  • DDeficiency disease
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Correct Answer: Option D — Deficiency disease
Explanation: Deficiency diseases result from the lack of essential nutrients in the diet such as vitamins and minerals causing conditions like scurvy rickets anaemia and goitre.
Submitted by: PaperMCQs
147
Biology Medium

What is the process by which organisms adapt to extreme cold by entering a state of dormancy?

  • AAestivation
  • BMigration
  • CDormancy
  • DHibernation
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Correct Answer: Option D — Hibernation
Explanation: Hibernation is a state of dormancy entered by some animals during cold winter months to conserve energy by lowering metabolic rate body temperature and heart rate.
Submitted by: PaperMCQs
148
Biology Easy

What is the term for the movement of populations of organisms from one region to another seasonally?

  • AMigration
  • BHibernation
  • CAestivation
  • DDormancy
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Correct Answer: Option A — Migration
Explanation: Migration is the seasonal movement of animals from one region to another typically following food availability and climate changes as seen in birds fish and wildebeest.
Submitted by: PaperMCQs
149
Biology Medium

How many kingdoms are in the traditional five-kingdom system of classification?

  • AThree
  • BFive
  • CFour
  • DSix
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Correct Answer: Option B — Five
Explanation: The traditional five-kingdom system classifies all life into Monera Protista Fungi Plantae and Animalia based on cell type nutrition mode and body organisation.
Submitted by: PaperMCQs
150
Biology Hard

What is the broadest level of biological classification?

  • ADomain
  • BOrder
  • CFamily
  • DKingdom
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Correct Answer: Option A — Domain
Explanation: Domain is the broadest level in the modern biological classification system above kingdom and includes three domains Bacteria Archaea and Eukarya.
Submitted by: PaperMCQs
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