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PPSC MCQs

Punjab Public Service Commission β€” Complete MCQ Bank

273 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.
PPSC preparation illustration
41

Which everyday item uses a bimetallic strip that bends when heated to control temperature in older thermostats?

  • AThermostat
  • BCompass
  • CHygrometer
  • DBarometer
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Correct Answer: Option A β€” Thermostat
Explanation: Older thermostats use a bimetallic strip that bends when heated because two bonded metals expand at different rates triggering a circuit to switch heating or cooling on and off.
Submitted by: PaperMCQs
42

Which part of the water cycle involves water falling from clouds back to the Earth's surface as rain snow or hail?

  • AEvaporation
  • BPrecipitation
  • CCondensation
  • DTranspiration
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Correct Answer: Option B β€” Precipitation
Explanation: Precipitation is the stage of the water cycle where water falls from clouds back to the Earth's surface in various forms including rain snow sleet and hail.
Submitted by: PaperMCQs
43

Which part of the water cycle involves water vapour cooling and turning back into liquid water droplets to form clouds?

  • AEvaporation
  • BCondensation
  • CPrecipitation
  • DTranspiration
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Correct Answer: Option B β€” Condensation
Explanation: Condensation is the part of the water cycle where water vapour cools as it rises and turns back into tiny liquid droplets forming clouds and fog in the atmosphere.
Submitted by: PaperMCQs
44

Which process in the water cycle involves the sun's energy turning liquid water into water vapour?

  • ACondensation
  • BPrecipitation
  • CEvaporation
  • DInfiltration
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Correct Answer: Option C β€” Evaporation
Explanation: Evaporation is the process in the water cycle where solar energy heats water in oceans lakes and rivers turning liquid water into water vapour that rises into the atmosphere.
Submitted by: PaperMCQs
45

Which device is used in submarines to see objects above the water surface without surfacing?

  • APeriscope
  • BSonar
  • CRadar
  • DTelescope
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Correct Answer: Option A β€” Periscope
Explanation: A periscope uses mirrors or prisms arranged at angles to reflect light allowing a submerged submarine or a person in a trench to see objects above without being visible.
Submitted by: PaperMCQs
46

Which everyday phenomenon explains why a ship made of steel can float despite steel being denser than water?

  • AThe ship displaces a volume of water equal to its weight
  • BSteel is lighter than water
  • CSteel reacts with seawater to reduce density
  • DShips contain compressed air making them float
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Correct Answer: Option A β€” The ship displaces a volume of water equal to its weight
Explanation: A steel ship floats because its hollow shape displaces a large volume of water whose weight equals the ship's weight satisfying Archimedes' principle even though steel itself sinks.
Submitted by: PaperMCQs
47

Which type of wave requires a material medium to travel and cannot propagate through vacuum?

  • AElectromagnetic wave
  • BLight wave
  • CSound wave
  • DRadio wave
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Correct Answer: Option C β€” Sound wave
Explanation: Sound is a mechanical wave that requires a material medium such as air water or solid to propagate and cannot travel through a vacuum unlike electromagnetic waves.
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48

Which naturally occurring radioactive element was discovered by Marie Curie and named after her home country?

  • AUranium
  • BRadium
  • CPolonium
  • DThorium
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Correct Answer: Option C β€” Polonium
Explanation: Marie Curie discovered polonium in 1898 and named it after her home country Poland making it the first element to be named after a country.
Submitted by: PaperMCQs
49

Which everyday phenomenon demonstrates that objects at higher temperature emit more thermal radiation?

  • AIce floating in water
  • BA rainbow forming after rain
  • CSound echoing in a room
  • DA red hot iron glowing
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Correct Answer: Option D β€” A red hot iron glowing
Explanation: A red hot iron glowing demonstrates that objects emit electromagnetic radiation including visible light when heated to sufficient temperatures and emit more radiation at higher temperatures.
Submitted by: PaperMCQs
50

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

  • ACovalent bond
  • BIonic bond
  • CMetallic bond
  • DHydrogen bond
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Correct Answer: Option B β€” Ionic bond
Explanation: An ionic bond forms when electrons are transferred from one atom to another creating oppositely charged ions that attract each other as seen in table salt sodium chloride.
Submitted by: PaperMCQs