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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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311
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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312
Chemistry Easy

What is the lightest element in the periodic table?

  • AHelium
  • BHydrogen
  • CLithium
  • DBeryllium
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Correct Answer: Option B — Hydrogen
Explanation: Hydrogen is the lightest and simplest element in the periodic table with atomic number 1 consisting of one proton and one electron in its most common form.
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313
Chemistry Easy

Which element has the chemical symbol Fe?

  • AFluorine
  • BIron
  • CFrancium
  • DFermium
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Correct Answer: Option B — Iron
Explanation: The chemical symbol Fe for iron comes from the Latin word Ferrum and iron is a transition metal with atomic number 26 widely used in construction and manufacturing.
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314
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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315
Chemistry Medium

Which particle determines the chemical properties of an element?

  • ANeutron
  • BElectron
  • CProton
  • DNucleus
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Correct Answer: Option B — Electron
Explanation: Electrons especially the valence electrons in the outermost shell determine the chemical properties of an element including its reactivity bonding behaviour and the compounds it forms.
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316
Chemistry Easy

Which gas has the chemical formula CO2?

  • ACarbon dioxide
  • BCarbon monoxide
  • CSulfur dioxide
  • DNitrogen dioxide
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Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide with the formula CO2 consists of one carbon atom double bonded to two oxygen atoms and is a major greenhouse gas produced by combustion and respiration.
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317
Chemistry Easy

What is the atomic number of oxygen?

  • A6
  • B10
  • C8
  • D16
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Correct Answer: Option C — 8
Explanation: Oxygen has an atomic number of 8 meaning it has 8 protons in its nucleus and typically 8 electrons in its neutral form with an electronic configuration of 2,6.
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318
Chemistry Medium

Which law states that matter can neither be created nor destroyed in a chemical reaction?

  • ALaw of Definite Proportions
  • BLaw of Multiple Proportions
  • CLaw of Conservation of Mass
  • DLaw of Combining Volumes
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Correct Answer: Option C — Law of Conservation of Mass
Explanation: The Law of Conservation of Mass proposed by Lavoisier states that the total mass of reactants equals the total mass of products in any chemical reaction.
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319
Chemistry Easy

What is the chemical formula for sulfuric acid?

  • AH2SO4
  • BHNO3
  • CHCl
  • DH3PO4
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Correct Answer: Option A — H2SO4
Explanation: Sulfuric acid has the chemical formula H2SO4 and is one of the most important industrial chemicals used in fertiliser production batteries and various chemical processes.
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320
Chemistry Medium

Which type of bond involves the complete transfer of electrons from one atom to another?

  • ACovalent bond
  • BIonic bond
  • CMetallic bond
  • DHydrogen bond
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Correct Answer: Option B — Ionic bond
Explanation: An ionic bond involves the complete transfer of one or more electrons from a metal atom to a non-metal atom creating oppositely charged ions that attract each other electrostatically.
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