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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
Exam Preparation Guide

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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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
321
Chemistry Easy

What is the pH of pure water at 25 degrees Celsius?

  • A5
  • B9
  • C7
  • D14
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Correct Answer: Option C — 7
Explanation: Pure water has a pH of exactly 7 at 25 degrees Celsius making it neutral as it contains equal concentrations of hydrogen and hydroxide ions.
Submitted by: PaperMCQs
322
Chemistry Easy

Which element is the most abundant in the universe?

  • AHydrogen
  • BHelium
  • CCarbon
  • DOxygen
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Correct Answer: Option A — Hydrogen
Explanation: Hydrogen is the most abundant element in the universe making up approximately 75 percent of all normal matter by mass and is the primary fuel for nuclear fusion in stars.
Submitted by: PaperMCQs
323
Chemistry Easy

What is the chemical formula for common table salt?

  • AKCl
  • BCaCl2
  • CMgCl2
  • DNaCl
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Correct Answer: Option D — NaCl
Explanation: Common table salt has the chemical formula NaCl or sodium chloride formed from the ionic bond between positively charged sodium ions and negatively charged chloride ions.
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324
Chemistry Easy

Which gas is produced when an acid reacts with a metal?

  • AOxygen
  • BHydrogen
  • CNitrogen
  • DCarbon dioxide
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Correct Answer: Option B — Hydrogen
Explanation: When acids react with metals hydrogen gas is produced along with a salt for example zinc reacting with hydrochloric acid produces zinc chloride and hydrogen gas.
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325
Chemistry Easy

What is the atomic number of carbon?

  • A4
  • B6
  • C8
  • D12
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Correct Answer: Option B — 6
Explanation: Carbon has an atomic number of 6 meaning it has 6 protons in its nucleus and 6 electrons in its neutral state making it the basis of all organic chemistry.
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326
Chemistry Easy

What is the chemical symbol for water?

  • AH2
  • BHO2
  • CH3O
  • DH2O
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Correct Answer: Option D — H2O
Explanation: Water has the chemical formula H2O consisting of two hydrogen atoms bonded to one oxygen atom through covalent bonds forming a polar molecule.
Submitted by: PaperMCQs
327
Chemistry Easy

Which scientist is known as the Father of Modern Chemistry?

  • AIsaac Newton
  • BRobert Boyle
  • CJohn Dalton
  • DAntoine Lavoisier
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Correct Answer: Option D — Antoine Lavoisier
Explanation: Antoine Lavoisier is known as the Father of Modern Chemistry for establishing the law of conservation of mass and developing a systematic chemical nomenclature.
Submitted by: PaperMCQs
328
Physics Medium

Which instrument is used to detect and measure very small electric currents?

  • AVoltmeter
  • BOhmmeter
  • CAmmeter
  • DGalvanometer
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Correct Answer: Option D — Galvanometer
Explanation: A galvanometer is a sensitive instrument used to detect and measure very small electric currents through the deflection of a needle in a magnetic field.
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329
Physics Medium

What is the function of an optical fibre?

  • ATo store electrical energy
  • BTo transmit light signals over long distances using total internal reflection
  • CTo measure temperature
  • DTo amplify sound waves
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Correct Answer: Option B — To transmit light signals over long distances using total internal reflection
Explanation: Optical fibres transmit light signals over long distances using total internal reflection within a glass or plastic fibre and are the backbone of modern high-speed internet communications.
Submitted by: PaperMCQs
330
Physics Hard

What is the name of the force that holds protons and neutrons together inside the nucleus?

  • AElectromagnetic force
  • BGravitational force
  • CStrong nuclear force
  • DWeak nuclear force
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Correct Answer: Option C — Strong nuclear force
Explanation: The strong nuclear force holds protons and neutrons together inside the atomic nucleus and is the strongest of the four fundamental forces operating only at very short ranges.
Submitted by: PaperMCQs
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