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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
721

Which acid in the stomach helps in the digestion of food and kills harmful bacteria?

  • ASulfuric acid
  • BHydrochloric acid
  • CAcetic acid
  • DCitric acid
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Correct Answer: Option B β€” Hydrochloric acid
Explanation: Hydrochloric acid secreted by stomach glands helps digest food by activating pepsin and also kills many harmful bacteria that may be present in ingested food.
Submitted by: PaperMCQs
722

Which stomach enzyme is primarily responsible for breaking down proteins into smaller peptides?

  • AAmylase
  • BLipase
  • CPepsin
  • DTrypsin
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Correct Answer: Option C β€” Pepsin
Explanation: Pepsin is a stomach enzyme that breaks down proteins into smaller peptides functioning optimally in the highly acidic environment created by hydrochloric acid in the stomach.
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723

Which enzyme present in saliva begins the digestion of starch in the mouth?

  • APepsin
  • BAmylase
  • CLipase
  • DTrypsin
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Correct Answer: Option B β€” Amylase
Explanation: Amylase present in saliva begins breaking down starch into simpler sugars during the initial stage of digestion before food even reaches the stomach.
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724

Which gland produces saliva to aid in the initial digestion of food in the mouth?

  • APituitary gland
  • BSalivary gland
  • CThyroid gland
  • DAdrenal gland
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Correct Answer: Option B β€” Salivary gland
Explanation: Salivary glands produce saliva containing enzymes like amylase that begin breaking down starches in food while also moistening it to ease swallowing and digestion.
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725

Which type of teeth are primarily used for grinding and chewing food at the back of the mouth?

  • AIncisors
  • BCanines
  • CMolars
  • DPremolars
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Correct Answer: Option C β€” Molars
Explanation: Molars located at the back of the mouth are primarily used for grinding and chewing food into smaller pieces before swallowing aiding in efficient digestion.
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726

Which type of teeth are primarily used for tearing food in humans?

  • AIncisors
  • BCanines
  • CMolars
  • DPremolars
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Correct Answer: Option B β€” Canines
Explanation: Canines are pointed teeth primarily used for tearing food while incisors cut and molars grind providing humans with a complete set of teeth for varied chewing functions.
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727

Which tube connects the middle ear to the throat helping equalize air pressure?

  • ACochlea
  • BEustachian tube
  • CAuditory canal
  • DSemicircular canal
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Correct Answer: Option B β€” Eustachian tube
Explanation: The Eustachian tube connects the middle ear to the throat helping equalize air pressure on both sides of the eardrum which is why ears may pop during altitude changes.
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728

Which part of the human ear converts sound vibrations into electrical signals for the brain?

  • AEardrum
  • BCochlea
  • COuter ear
  • DEustachian tube
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Correct Answer: Option B β€” Cochlea
Explanation: The cochlea located in the inner ear converts sound vibrations into electrical nerve signals which are then transmitted to the brain via the auditory nerve for interpretation.
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729

Which part of the human ear is primarily responsible for maintaining balance?

  • ACochlea
  • BSemicircular canals
  • CEardrum
  • DAuditory nerve
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Correct Answer: Option B β€” Semicircular canals
Explanation: The semicircular canals located in the inner ear detect rotational movements of the head and play a primary role in maintaining body balance and spatial orientation.
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730

Which gas is most responsible for causing acid rain when it reacts with atmospheric moisture?

  • ACarbon dioxide
  • BSulfur dioxide
  • CNitrogen
  • DHelium
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Correct Answer: Option B β€” Sulfur dioxide
Explanation: Sulfur dioxide released from burning fossil fuels reacts with water vapor in the atmosphere forming sulfuric acid which falls as acid rain damaging soil water bodies and structures.
Submitted by: PaperMCQs