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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
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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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301
Chemistry Easy

What is the chemical formula for methane, the main component of natural gas?

  • AC2H6
  • BCH4
  • CC3H8
  • DC2H4
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Correct Answer: Option B — CH4
Explanation: Methane has the chemical formula CH4 consisting of one carbon atom bonded to four hydrogen atoms and is the simplest alkane and the primary component of natural gas.
Submitted by: PaperMCQs
302
Chemistry Medium

Which gas is used in fire extinguishers to smother flames by displacing oxygen?

  • ACarbon dioxide
  • BNitrogen
  • COxygen
  • DWater vapour
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Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide is used in fire extinguishers because it displaces oxygen around flames extinguishing the fire without leaving corrosive residue making it ideal for electrical fires.
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303
Chemistry Medium

What is the name of the vertical columns in the periodic table?

  • APeriods
  • BBlocks
  • CGroups
  • DRows
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Correct Answer: Option C — Groups
Explanation: Groups are the vertical columns in the periodic table and elements in the same group have the same number of valence electrons giving them similar chemical properties and reactivity.
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304
Chemistry Medium

What is the name of the horizontal rows in the periodic table?

  • AGroups
  • BBlocks
  • CPeriods
  • DFamilies
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Correct Answer: Option C — Periods
Explanation: Periods are the horizontal rows in the periodic table and elements in the same period have the same number of electron shells with properties changing systematically across each period.
Submitted by: PaperMCQs
305
Chemistry Medium

Which process separates a mixture of liquids based on their different boiling points?

  • ADistillation
  • BFiltration
  • CCrystallisation
  • DChromatography
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Correct Answer: Option A — Distillation
Explanation: Distillation separates mixtures of liquids with different boiling points by heating the mixture and selectively condensing and collecting vapours of the lower boiling point component.
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306
Chemistry Medium

What is the chemical formula for glucose, the primary energy source for cells?

  • AC6H10O5
  • BC12H22O11
  • CC6H12O6
  • DC6H6O6
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Correct Answer: Option C — C6H12O6
Explanation: Glucose has the chemical formula C6H12O6 and is a monosaccharide sugar that serves as the primary energy source for cellular respiration in living organisms.
Submitted by: PaperMCQs
307
Chemistry Easy

Which element is a liquid at room temperature and is used in thermometers?

  • ABromine
  • BGallium
  • CMercury
  • DCaesium
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Correct Answer: Option C — Mercury
Explanation: Mercury is a metal that remains liquid at room temperature with a melting point of minus 38.8 degrees Celsius and has been traditionally used in thermometers and barometers.
Submitted by: PaperMCQs
308
Chemistry Easy

What is the chemical formula for ammonia?

  • ANO2
  • BN2H4
  • CNH3
  • DNH4
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Correct Answer: Option C — NH3
Explanation: Ammonia has the chemical formula NH3 consisting of one nitrogen atom bonded to three hydrogen atoms and is widely used in fertiliser production and as a cleaning agent.
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309
Chemistry Easy

Which acid is found naturally in vinegar?

  • AAcetic acid
  • BSulfuric acid
  • CHydrochloric acid
  • DCitric acid
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Correct Answer: Option A — Acetic acid
Explanation: Acetic acid also known as ethanoic acid is the organic acid found in vinegar at concentrations of 4 to 8 percent giving it its characteristic sour taste and pungent smell.
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310
Chemistry Medium

What is the valency of carbon that makes it the basis of organic chemistry?

  • A2
  • B3
  • C4
  • D6
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Correct Answer: Option C — 4
Explanation: Carbon has a valency of 4 meaning it can form four covalent bonds with other atoms allowing it to create an enormous variety of organic compounds through chains and rings.
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