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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

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271
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.
Submitted by: PaperMCQs
272
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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273
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.
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274
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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275
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
276
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
277
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.
Submitted by: PaperMCQs
278
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.
Submitted by: PaperMCQs
279
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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280
Chemistry Medium

Which type of chemical reaction involves a substance combining with oxygen to release energy?

  • AReduction
  • BOxidation
  • CNeutralisation
  • DDecomposition
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Correct Answer: Option B — Oxidation
Explanation: Oxidation involves the combination of a substance with oxygen releasing energy often as heat and light as seen in combustion reactions such as burning wood or fuels.
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