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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

273 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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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
241
Everyday Science Medium

Which type of lens is used to correct myopia or nearsightedness?

  • AConvex lens
  • BConcave lens
  • CBifocal lens
  • DCylindrical lens
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Correct Answer: Option B — Concave lens
Explanation: Concave lenses are used to correct myopia or nearsightedness because they diverge light rays before they enter the eye allowing the image to focus properly on the retina.
Submitted by: PaperMCQs
242
Everyday Science Medium

Which everyday device uses the principle of capillary action to function?

  • AThermometer
  • BCandle wick
  • CBarometer
  • DMagnet
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Correct Answer: Option B — Candle wick
Explanation: A candle wick uses capillary action to draw melted wax upward toward the flame allowing continuous burning as the liquid wax is pulled through the narrow fibers of the wick.
Submitted by: PaperMCQs
243
Everyday Science Medium

Which gas law states that the volume of a gas is directly proportional to its temperature at constant pressure?

  • ABoyle's law
  • BCharles's law
  • CGay-Lussac's law
  • DAvogadro's law
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Correct Answer: Option B — Charles's law
Explanation: Charles's law states that at constant pressure the volume of a gas is directly proportional to its absolute temperature meaning gas expands when heated and contracts when cooled.
Submitted by: PaperMCQs
244
Everyday Science Medium

Which gas law states that pressure and volume of a gas are inversely proportional at constant temperature?

  • ABoyle's law
  • BCharles's law
  • CGay-Lussac's law
  • DAvogadro's law
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Correct Answer: Option A — Boyle's law
Explanation: Boyle's law states that at constant temperature the pressure of a gas is inversely proportional to its volume meaning increased pressure results in decreased volume and vice versa.
Submitted by: PaperMCQs
245
Everyday Science Medium

Which principle explains the lift generated by an aircraft wing due to differences in air pressure?

  • APascal's law
  • BBernoulli's principle
  • CArchimedes' principle
  • DBoyle's law
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Correct Answer: Option B — Bernoulli's principle
Explanation: Bernoulli's principle explains that faster moving air over an aircraft wing creates lower pressure compared to slower air beneath generating the lift needed for flight.
Submitted by: PaperMCQs
246
Everyday Science Medium

Which scientific principle explains why objects float or sink in a fluid?

  • AArchimedes' principle
  • BPascal's law
  • CBernoulli's principle
  • DNewton's law
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Correct Answer: Option A — Archimedes' principle
Explanation: Archimedes' principle states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of fluid displaced determining whether it floats or sinks.
Submitted by: PaperMCQs
247
Everyday Science Medium

Which law explains the equal and opposite reaction observed when a rocket launches?

  • ANewton's first law
  • BNewton's second law
  • CNewton's third law
  • DLaw of conservation of energy
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Correct Answer: Option C — Newton's third law
Explanation: Newton's third law states that for every action there is an equal and opposite reaction explaining how a rocket is propelled forward by expelling gases backward at high speed.
Submitted by: PaperMCQs
248
Everyday Science Medium

Which law of motion explains why passengers lurch forward when a moving bus suddenly stops?

  • ANewton's first law
  • BNewton's second law
  • CNewton's third law
  • DLaw of gravitation
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Correct Answer: Option A — Newton's first law
Explanation: Newton's first law of inertia explains that passengers continue moving forward when a bus suddenly stops because objects in motion tend to remain in motion unless acted upon by an external force.
Submitted by: PaperMCQs
249
Everyday Science Easy

Which type of energy is stored in the chemical bonds of food and fuels?

  • AKinetic energy
  • BPotential energy
  • CChemical energy
  • DThermal energy
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Correct Answer: Option C — Chemical energy
Explanation: Chemical energy is stored in the bonds between atoms in food and fuels and is released through chemical reactions such as digestion or combustion to perform useful work.
Submitted by: PaperMCQs
250
Everyday Science Medium

Which element is the primary component of natural gas used for cooking and heating?

  • APropane
  • BMethane
  • CButane
  • DEthane
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Correct Answer: Option B — Methane
Explanation: Methane is the primary component of natural gas commonly used for cooking and heating due to its high combustion efficiency and widespread availability through pipeline distribution.
Submitted by: PaperMCQs
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