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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

90 Questions
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71
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.
Submitted by: PaperMCQs
72
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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73
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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74
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.
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75
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
76
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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77
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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78
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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79
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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80
Chemistry Easy

What is the name of the process by which a liquid changes to a gas at its boiling point?

  • AVaporisation
  • BSublimation
  • CCondensation
  • DFreezing
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Correct Answer: Option A — Vaporisation
Explanation: Vaporisation is the process by which a liquid changes to a gas at its boiling point when sufficient thermal energy overcomes the intermolecular forces holding liquid molecules together.
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