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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
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PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

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Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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261
Chemistry Medium

Which type of chemical formula shows the simplest whole number ratio of atoms in a compound?

  • AMolecular formula
  • BStructural formula
  • CDisplayed formula
  • DEmpirical formula
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Correct Answer: Option D — Empirical formula
Explanation: An empirical formula shows the simplest whole number ratio of each type of atom in a compound for example glucose C6H12O6 has the empirical formula CH2O.
Submitted by: PaperMCQs
262
Chemistry Medium

What is the concentration of a solution measured in moles per litre called?

  • ANormality
  • BMolality
  • CFormality
  • DMolarity
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Correct Answer: Option D — Molarity
Explanation: Molarity is the measure of concentration of a solution expressed as the number of moles of solute dissolved per litre of solution with units of mol/L or M.
Submitted by: PaperMCQs
263
Chemistry Medium

Which scientific law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules?

  • ABoyle's Law
  • BGay-Lussac's Law
  • CAvogadro's Law
  • DCharles's Law
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Correct Answer: Option C — Avogadro's Law
Explanation: Avogadro's Law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules regardless of the nature of the gas.
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264
Chemistry Medium

Which type of reaction occurs when a more reactive metal displaces a less reactive metal from its salt solution?

  • ADecomposition
  • BNeutralisation
  • CCombustion
  • DDisplacement
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Correct Answer: Option D — Displacement
Explanation: Displacement reactions occur when a more reactive metal replaces a less reactive metal from its salt solution as seen when iron displaces copper from copper sulfate solution.
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265
Chemistry Hard

What is the chemical formula for potassium permanganate a strong oxidising agent?

  • AKMnO4
  • BK2MnO4
  • CK2SO4
  • DK2Cr2O7
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Correct Answer: Option A — KMnO4
Explanation: Potassium permanganate has the formula KMnO4 and is a strong oxidising agent used in water treatment as a disinfectant and in analytical chemistry as a titrating agent.
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266
Chemistry Hard

Which synthetic polymer was the first to be produced commercially and is used to make electrical fittings?

  • ANylon
  • BPVC
  • CBakelite
  • DPolythene
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Correct Answer: Option C — Bakelite
Explanation: Bakelite was the first commercially produced synthetic polymer made from phenol and formaldehyde in 1907 and is used in electrical fittings phone casings and kitchenware.
Submitted by: PaperMCQs
267
Chemistry Medium

Which polymer is used to make plastic water bottles and is identified by recycling code 1?

  • APET polyethylene terephthalate
  • BPVC
  • CPolystyrene
  • DPolypropylene
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Correct Answer: Option A — PET polyethylene terephthalate
Explanation: PET or polyethylene terephthalate is the plastic used to make water bottles and food packaging and is identified by the recycling code 1 on containers.
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268
Chemistry Hard

What is the chemical formula for bleaching powder used in water purification?

  • ACa(OH)2
  • BCaCO3
  • CCa(OCl)Cl
  • DCaCl2
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Correct Answer: Option C — Ca(OCl)Cl
Explanation: Bleaching powder is calcium hypochlorite chloride Ca(OCl)Cl made by passing chlorine gas over slaked lime and used as a disinfectant and bleaching agent.
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269
Chemistry Medium

What is saponification in chemistry?

  • AMaking soap by reacting fats with a strong alkali
  • BConversion of oils to alcohol
  • CAdding hydrogen to unsaturated fats
  • DMaking esters from acids and alcohols
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Correct Answer: Option A — Making soap by reacting fats with a strong alkali
Explanation: Saponification is the process of making soap by reacting fats or oils with a strong alkali such as sodium hydroxide producing glycerol and soap molecules.
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270
Chemistry Medium

Which process converts vegetable oils into solid fats by adding hydrogen in the presence of a nickel catalyst?

  • ASaponification
  • BHydrogenation
  • CEsterification
  • DFermentation
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Correct Answer: Option B — Hydrogenation
Explanation: Hydrogenation adds hydrogen gas to unsaturated vegetable oils in the presence of a nickel catalyst converting carbon to carbon double bonds to single bonds producing solid margarine.
Submitted by: PaperMCQs
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