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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
261

Which process explains why sweating helps cool the human body?

  • AConduction
  • BConvection
  • CEvaporation
  • DRadiation
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Correct Answer: Option C β€” Evaporation
Explanation: Sweating cools the body through evaporation as sweat absorbs heat from the skin and turns into vapor effectively removing thermal energy and lowering body temperature.
Submitted by: PaperMCQs
262

Which household appliance operates on the principle of electromagnetic induction to heat food?

  • AMicrowave oven
  • BInduction stove
  • CElectric kettle
  • DToaster
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Correct Answer: Option B β€” Induction stove
Explanation: Induction stoves use electromagnetic induction to generate heat directly within ferromagnetic cookware making them more energy efficient than traditional electric or gas stoves.
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263

Which gas is commonly used to fill balloons so that they float in air?

  • AOxygen
  • BCarbon dioxide
  • CHelium
  • DNitrogen
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Correct Answer: Option C β€” Helium
Explanation: Helium is used to fill balloons because it is significantly lighter than air allowing balloons to float and rise due to its low density compared to atmospheric gases.
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264

Which property of light explains why a straw appears bent when placed in a glass of water?

  • AReflection
  • BRefraction
  • CDiffraction
  • DDispersion
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Correct Answer: Option B β€” Refraction
Explanation: Refraction is the bending of light as it passes from one medium to another with different optical densities causing the straw to appear bent at the water's surface.
Submitted by: PaperMCQs
265

Which type of mirror is commonly used in vehicle side mirrors to provide a wider field of view?

  • AConcave mirror
  • BConvex mirror
  • CPlane mirror
  • DParabolic mirror
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Correct Answer: Option B β€” Convex mirror
Explanation: Convex mirrors are used in vehicle side mirrors because they diverge light rays producing a smaller but wider field of view helping drivers see more of their surroundings.
Submitted by: PaperMCQs
266

Which simple machine is used in a pair of scissors?

  • ALever
  • BPulley
  • CWheel and axle
  • DInclined plane
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Correct Answer: Option A β€” Lever
Explanation: Scissors function as a compound lever where two blades pivot around a fixed point allowing mechanical advantage to cut through materials with reduced applied force.
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267

What is the normal body temperature of a healthy human in degrees Fahrenheit?

  • A95.6
  • B98.6
  • C101.6
  • D93.6
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Correct Answer: Option B β€” 98.6
Explanation: The average normal human body temperature is approximately 98.6 degrees Fahrenheit equivalent to 37 degrees Celsius though slight variations are normal among individuals throughout the day.
Submitted by: PaperMCQs
268

Which gas do plants primarily absorb during photosynthesis?

  • AOxygen
  • BCarbon dioxide
  • CNitrogen
  • DHydrogen
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Correct Answer: Option B β€” Carbon dioxide
Explanation: Plants absorb carbon dioxide from the atmosphere during photosynthesis using sunlight and water to convert it into glucose and oxygen which is released as a byproduct.
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269

Which organ in the human body is primarily responsible for filtering blood and removing waste?

  • ALiver
  • BKidney
  • CSpleen
  • DPancreas
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Correct Answer: Option B β€” Kidney
Explanation: The kidneys filter blood to remove metabolic waste products and excess fluids excreting them as urine while also regulating electrolyte balance and blood pressure in the body.
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270

Which vitamin is primarily synthesized in human skin upon sunlight exposure?

  • AVitamin A
  • BVitamin C
  • CVitamin D
  • DVitamin K
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Correct Answer: Option C β€” Vitamin D
Explanation: Vitamin D is synthesized in the skin when exposed to ultraviolet B rays from sunlight and is essential for calcium absorption and maintaining healthy bones and immune function.
Submitted by: PaperMCQs