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PPSC MCQs

Punjab Public Service Commission β€” Complete MCQ Bank

1,259 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
641

Which sorting algorithm generally provides the best average-case performance for large datasets?

  • AQuick Sort
  • BMerge Sort
  • CBubble Sort
  • DSelection Sort
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Correct Answer: Option A β€” Quick Sort
Explanation: Quick Sort is often considered the fastest sorting algorithm in the average case because it has an average time complexity of O(n log n) and requires relatively low memory. It works by selecting a pivot element and partitioning the array into smaller subarrays. Although its worst-case complexity is O(nΒ²), careful pivot selection usually results in very efficient performance in real-world applications.
Submitted by: Chandi
642

Which memory type is most commonly used to store firmware in embedded systems?

  • ARAM
  • BVirtual Memory
  • CCache Memory
  • DROM
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Correct Answer: Option D β€” ROM
Explanation: ROM (Read-Only Memory) is commonly used to store firmware in embedded systems because it retains data even when power is turned off. Firmware contains essential instructions required for hardware initialization and operation. Unlike RAM, ROM provides non-volatile storage, making it reliable for permanent system software and device control programs.
Submitted by: Chandi
643

Who co-invented the World Wide Web (WWW) alongside Robert Cailliau?

  • ATom Berners
  • BMark Zuckerberg
  • CTim Berners-Lee
  • DBill Gates
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Correct Answer: Option C β€” Tim Berners-Lee
Explanation: Tim Berners-Lee, together with Robert Cailliau, played a key role in developing the World Wide Web at CERN in 1989. Berners-Lee created fundamental web technologies such as HTML, HTTP, and the first web browser. Their work transformed the internet into a user-friendly system for sharing and accessing information worldwide.
Submitted by: Chandi
644

Which everyday safety device detects dangerous levels of carbon monoxide in homes?

  • ASmoke detector
  • BCarbon monoxide detector
  • CThermostat
  • DHygrometer
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Correct Answer: Option B β€” Carbon monoxide detector
Explanation: Carbon monoxide detectors are specialized safety devices that detect dangerous levels of this odorless gas in homes alerting occupants before harmful exposure occurs.
Submitted by: PaperMCQs
645

Which colorless and odorless gas is particularly dangerous because it can cause poisoning without detection unless monitored?

  • ANatural gas
  • BCarbon monoxide
  • CHelium
  • DNitrogen
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Correct Answer: Option B β€” Carbon monoxide
Explanation: Carbon monoxide is a colorless and odorless gas produced by incomplete combustion making it particularly dangerous since it can cause poisoning without detection unless monitored by alarms.
Submitted by: PaperMCQs
646

Which common gas leak hazard in homes is often detected by its distinctive rotten egg smell added intentionally for safety?

  • ANatural gas leaks
  • BCarbon monoxide leaks
  • COxygen leaks
  • DNitrogen leaks
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Correct Answer: Option A β€” Natural gas leaks
Explanation: Natural gas is odorless in its pure form so a chemical called mercaptan is intentionally added to give it a rotten egg smell allowing people to detect leaks for safety.
Submitted by: PaperMCQs
647

Which storage practice helps slow down the ripening and spoilage process of most fruits and vegetables?

  • AStoring at room temperature
  • BRefrigeration
  • CStoring in direct sunlight
  • DStoring in plastic without ventilation
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Correct Answer: Option B β€” Refrigeration
Explanation: Refrigeration slows down the ripening and spoilage process of most fruits and vegetables by reducing the rate of enzymatic and microbial activity that causes decay.
Submitted by: PaperMCQs
648

Which common food safety practice prevents cross contamination between raw meat and other foods?

  • AUsing the same cutting board for everything
  • BUsing separate cutting boards for raw meat
  • CWashing hands only after cooking
  • DStoring meat at room temperature
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Correct Answer: Option B β€” Using separate cutting boards for raw meat
Explanation: Using separate cutting boards for raw meat and other foods prevents cross contamination by avoiding the transfer of harmful bacteria from raw meat to ready to eat items.
Submitted by: PaperMCQs
649

Which everyday hygiene practice is most effective in preventing the spread of common cold and flu viruses?

  • AWashing hands frequently
  • BEating spicy food
  • CDrinking cold water
  • DWearing sunglasses
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Correct Answer: Option A β€” Washing hands frequently
Explanation: Washing hands frequently with soap and water removes viruses and bacteria from the skin significantly reducing the risk of spreading common cold and flu infections to others.
Submitted by: PaperMCQs
650

Which type of microorganism is responsible for causing common food spoilage through mold growth?

  • ABacteria
  • BFungi
  • CVirus
  • DProtozoa
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Correct Answer: Option B β€” Fungi
Explanation: Fungi including various molds are responsible for common food spoilage by breaking down organic material and producing visible fuzzy growth on items like bread and fruit.
Submitted by: PaperMCQs