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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

94 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
1
Biology Easy

Which gas is released by organisms as a byproduct of cellular respiration?

  • ACarbon dioxide
  • BOxygen
  • CNitrogen
  • DHydrogen
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Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide is released as a byproduct of cellular respiration when glucose is broken down to produce ATP and must be exhaled by animals or used by plants in photosynthesis.
Submitted by: PaperMCQs
2
Biology Easy

Which gas is released by plants as a byproduct of photosynthesis?

  • ACarbon dioxide
  • BNitrogen
  • COxygen
  • DWater vapour
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Correct Answer: Option C — Oxygen
Explanation: Oxygen is released as a byproduct of photosynthesis during the light-dependent reactions when water molecules are split through photolysis providing electrons to replace those lost by chlorophyll.
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3
Biology Medium

Which chromosomal disorder is caused by the presence of an extra chromosome 21?

  • ATurner syndrome
  • BDown syndrome
  • CKlinefelter syndrome
  • DPatau syndrome
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Correct Answer: Option B — Down syndrome
Explanation: Down syndrome also called trisomy 21 is caused by the presence of an extra copy of chromosome 21 resulting in intellectual disability and characteristic physical features.
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4
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
5
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
6
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
7
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
8
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.
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9
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.
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10
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
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