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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

269 Questions
Exam Preparation Guide

How to prepare for FPSC

FPSC recruitment tests assess subject knowledge, general ability and job-related competence for federal government positions across Pakistan.

General KnowledgeCurrent AffairsEnglishJob-related Subjects
Read the official syllabus first, then combine subject-specific revision with timed mixed-question practice.
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51

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 — 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
52

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 — 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
53

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 — 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
54

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 — 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.
Submitted by: PaperMCQs
55

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 — 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.
Submitted by: PaperMCQs
56

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 — 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.
Submitted by: PaperMCQs
57

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 — 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.
Submitted by: PaperMCQs
58

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 — 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.
Submitted by: PaperMCQs
59

Which unit measures the loudness or intensity of sound?

  • AHertz
  • BDecibel
  • CJoule
  • DNewton
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Correct Answer: Option B — 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.
Submitted by: PaperMCQs
60

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 — 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.
Submitted by: PaperMCQs