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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
161

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.
Submitted by: PaperMCQs
162

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.
Submitted by: PaperMCQs
163

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.
Submitted by: PaperMCQs
164

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.
Submitted by: PaperMCQs
165

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.
Submitted by: PaperMCQs
166

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.
Submitted by: PaperMCQs
167

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.
Submitted by: PaperMCQs
168

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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169

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
170

Which everyday safety practice helps protect skin from harmful ultraviolet radiation during sun exposure?

  • AWearing dark clothing only
  • BApplying sunscreen
  • CDrinking more water
  • DAvoiding all outdoor activity
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Correct Answer: Option B β€” Applying sunscreen
Explanation: Applying sunscreen helps protect skin from harmful ultraviolet radiation by absorbing or reflecting UV rays reducing the risk of sunburn and long term skin damage from sun exposure.
Submitted by: PaperMCQs