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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
51

Which type of chemical bond involves the sharing of electrons between atoms?

  • AIonic bond
  • BMetallic bond
  • CCovalent bond
  • DHydrogen bond
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Correct Answer: Option C β€” Covalent bond
Explanation: A covalent bond forms when atoms share electrons between them to achieve stable electron configurations commonly seen in molecules like water and carbon dioxide.
Submitted by: PaperMCQs
52

Which everyday phenomenon explains how a guitar produces different musical notes when different strings are plucked?

  • AAll strings vibrate at the same frequency
  • BLonger strings produce higher pitch
  • CStrings of different mass and tension vibrate at different frequencies
  • DThicker strings always produce higher notes
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Correct Answer: Option C β€” Strings of different mass and tension vibrate at different frequencies
Explanation: Guitar strings of different thickness and tension vibrate at different natural frequencies when plucked producing different musical pitches from deep bass to high treble notes.
Submitted by: PaperMCQs
53

Which part of the human body regulates temperature through sweating and blood vessel dilation?

  • ALiver
  • BLungs
  • CSkin
  • DKidney
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Correct Answer: Option C β€” Skin
Explanation: The skin regulates body temperature through sweating to cool down and constricting or dilating blood vessels to retain or release heat maintaining thermal homeostasis.
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54

Which household disinfectant chemical is commonly used to purify drinking water in small quantities?

  • AChlorine
  • BSulfuric acid
  • CHydrochloric acid
  • DAmmonia
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Correct Answer: Option A β€” Chlorine
Explanation: Chlorine is commonly added in small safe quantities to drinking water supplies to kill bacteria viruses and other pathogens making the water safe for human consumption.
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55

Which phenomenon is responsible for the formation of a shadow?

  • ARefraction
  • BRectilinear propagation of light
  • CAbsorption
  • DDispersion
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Correct Answer: Option B β€” Rectilinear propagation of light
Explanation: Shadows form because light travels in straight lines and when an opaque object blocks the light path a region of darkness called a shadow forms behind the object.
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56

What is the approximate speed of light in a vacuum?

  • A300 km per second
  • B3000 km per second
  • C300000 km per second
  • D3000000 km per second
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Correct Answer: Option C β€” 300000 km per second
Explanation: Light travels at approximately 300000 kilometres per second in a vacuum making it the fastest known phenomenon in the universe and a fundamental constant in physics.
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57

Which everyday device changes alternating current from power lines to the lower voltages suitable for homes?

  • ATransformer
  • BGenerator
  • CBattery
  • DInverter
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Correct Answer: Option A β€” Transformer
Explanation: Transformers step down the high voltage alternating current from power transmission lines to the lower voltages suitable for safe use in residential and commercial buildings.
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58

Which unit measures the loudness or intensity of sound?

  • AHertz
  • BDecibel
  • CJoule
  • DNewton
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Correct Answer: Option B β€” Decibel
Explanation: Decibel is the unit used to measure sound intensity or loudness with normal conversation at about 60 dB and sounds above 85 dB potentially damaging hearing over time.
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59

Which unit measures the frequency of sound waves typically expressed as cycles per second?

  • ADecibel
  • BJoule
  • CHertz
  • DPascal
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Correct Answer: Option C β€” Hertz
Explanation: Hertz is the unit that measures the frequency of sound waves representing the number of cycles per second with human hearing ranging from about 20 Hz to 20000 Hz.
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60

Which human body system is primarily responsible for fighting infections and diseases?

  • ADigestive system
  • BImmune system
  • CSkeletal system
  • DExcretory system
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Correct Answer: Option B β€” Immune system
Explanation: The immune system is the body's primary defense against infections and diseases using white blood cells antibodies and lymph nodes to detect and destroy pathogens.
Submitted by: PaperMCQs