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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

96 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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1
Chemistry Medium

Which type of chemical bond involves atoms sharing electrons unequally due to difference in electronegativity?

  • ANon-polar covalent bond
  • BPolar covalent bond
  • CMetallic bond
  • DIonic bond
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Correct Answer: Option B — Polar covalent bond
Explanation: A polar covalent bond forms when electrons are shared unequally between atoms of different electronegativities creating partial positive and negative charges on the molecule as in water.
Submitted by: PaperMCQs
2
Chemistry Medium

Which type of formula shows all the bonds between atoms in a molecule?

  • AEmpirical formula
  • BStructural formula
  • CMolecular formula
  • DIonic formula
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Correct Answer: Option B — Structural formula
Explanation: A structural formula shows all the atoms in a molecule and the bonds between them either as a displayed formula showing each bond or as a condensed structural formula.
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3
Chemistry Easy

What is the chemical symbol for lead?

  • APb
  • BLd
  • CLe
  • DLi
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Correct Answer: Option A — Pb
Explanation: The chemical symbol for lead is Pb derived from the Latin word Plumbum and lead is a dense heavy metal with atomic number 82 used in batteries and radiation shielding.
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4
Chemistry Easy

Which gas turns limewater milky when bubbled through it?

  • AOxygen
  • BCarbon dioxide
  • CHydrogen
  • DSulfur dioxide
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Correct Answer: Option B — Carbon dioxide
Explanation: Carbon dioxide turns limewater milky when bubbled through it as it reacts with calcium hydroxide to produce insoluble calcium carbonate as a white precipitate.
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5
Chemistry Easy

Which process converts sugar into alcohol and carbon dioxide using yeast?

  • ADistillation
  • BHydrogenation
  • CSaponification
  • DFermentation
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Correct Answer: Option D — Fermentation
Explanation: Fermentation is the anaerobic process by which yeast converts sugars into ethanol and carbon dioxide producing alcoholic beverages and is also used in bread making.
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6
Chemistry Medium

What is the chemical name of the compound with formula Na2SO4?

  • ASodium sulfite
  • BSodium sulfate
  • CSodium sulfide
  • DSodium bisulfate
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Correct Answer: Option B — Sodium sulfate
Explanation: Na2SO4 is sodium sulfate also known as Glauber's salt and is used in the manufacture of detergents glass paper pulp and as a drying agent in organic chemistry.
Submitted by: PaperMCQs
7
Chemistry Medium

Which indicator is colourless in acidic solution and pink in alkaline solution?

  • ALitmus
  • BMethyl orange
  • CUniversal indicator
  • DPhenolphthalein
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Correct Answer: Option D — Phenolphthalein
Explanation: Phenolphthalein is colourless in acidic and neutral solutions but turns pink to magenta in alkaline solutions and is commonly used as an indicator in acid-base titrations.
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8
Chemistry Easy

Which indicator turns red in acidic solutions and blue in alkaline solutions?

  • ALitmus
  • BUniversal indicator
  • CPhenolphthalein
  • DMethyl orange
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Correct Answer: Option A — Litmus
Explanation: Litmus is a natural pH indicator derived from lichens that turns red in acidic solutions with pH below 7 and blue in alkaline solutions with pH above 7.
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9
Chemistry Hard

Which law states that the amount of substance deposited during electrolysis is directly proportional to the quantity of electricity passed?

  • ABoyle's Law
  • BGay-Lussac's Law
  • CAvogadro's Law
  • DFaraday's First Law of Electrolysis
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Correct Answer: Option D — Faraday's First Law of Electrolysis
Explanation: Faraday's First Law of Electrolysis states that the mass of a substance deposited at an electrode during electrolysis is directly proportional to the quantity of charge passed.
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10
Chemistry Medium

Which type of reaction in organic chemistry involves replacing a hydrogen atom with another atom or group?

  • AElimination
  • BSubstitution
  • CAddition
  • DHydrolysis
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Correct Answer: Option B — Substitution
Explanation: Substitution reactions replace one atom or group in a molecule with another as seen when chlorine substitutes hydrogen in methane under UV light producing chloromethane.
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