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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
251

Which vitamin deficiency commonly causes night blindness in humans?

  • AVitamin A
  • BVitamin B1
  • CVitamin C
  • DVitamin E
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Correct Answer: Option A β€” Vitamin A
Explanation: Vitamin A deficiency commonly causes night blindness because this vitamin is essential for producing rhodopsin a pigment in the retina necessary for vision in low light conditions.
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252

Which vitamin deficiency commonly causes the disease scurvy?

  • AVitamin A
  • BVitamin B12
  • CVitamin C
  • DVitamin D
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Correct Answer: Option C β€” Vitamin C
Explanation: Scurvy is caused by a deficiency of Vitamin C which is essential for collagen synthesis and its absence leads to symptoms such as bleeding gums and joint pain.
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253

Which gland in the human body is often referred to as the master gland because it controls other endocrine glands?

  • AThyroid gland
  • BPituitary gland
  • CAdrenal gland
  • DPancreas
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Correct Answer: Option B β€” Pituitary gland
Explanation: The pituitary gland is referred to as the master gland because it secretes hormones that regulate the activity of other endocrine glands throughout the human body.
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254

Which part of the human brain regulates vital involuntary functions such as breathing and heartbeat?

  • ACerebrum
  • BCerebellum
  • CMedulla oblongata
  • DHypothalamus
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Correct Answer: Option C β€” Medulla oblongata
Explanation: The medulla oblongata located in the brainstem regulates vital involuntary functions including breathing heart rate and blood pressure essential for sustaining basic life processes.
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255

Which part of the human brain is primarily responsible for controlling balance and coordination?

  • ACerebrum
  • BCerebellum
  • CMedulla oblongata
  • DHypothalamus
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Correct Answer: Option B β€” Cerebellum
Explanation: The cerebellum located at the back of the brain is primarily responsible for controlling balance posture and fine motor coordination during voluntary muscle movements.
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256

Which blood type is known as the universal recipient for blood transfusions?

  • AO negative
  • BAB positive
  • CA negative
  • DB positive
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Correct Answer: Option B β€” AB positive
Explanation: AB positive blood is known as the universal recipient type because it contains both A and B antigens along with the Rh factor allowing it to accept blood from all other types.
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257

Which blood type is known as the universal donor for blood transfusions?

  • AA positive
  • BAB positive
  • CO negative
  • DB negative
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Correct Answer: Option C β€” O negative
Explanation: O negative blood is known as the universal donor type because it lacks A B and Rh antigens making it compatible with recipients of nearly any blood type in emergency transfusions.
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258

Which layer of the atmosphere contains the ozone layer that absorbs harmful ultraviolet radiation?

  • ATroposphere
  • BStratosphere
  • CMesosphere
  • DThermosphere
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Correct Answer: Option B β€” Stratosphere
Explanation: The stratosphere contains the ozone layer which absorbs most of the sun's harmful ultraviolet radiation protecting living organisms on Earth from excessive UV exposure.
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259

Which gas is primarily responsible for the greenhouse effect contributing most to global warming?

  • AOxygen
  • BCarbon dioxide
  • CNitrogen
  • DHelium
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Correct Answer: Option B β€” Carbon dioxide
Explanation: Carbon dioxide is the primary greenhouse gas contributing to global warming as it traps heat in the atmosphere due to human activities like fossil fuel combustion and deforestation.
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260

Which natural phenomenon results from the dispersion of sunlight through water droplets in the atmosphere?

  • AAurora
  • BRainbow
  • CMirage
  • DHalo
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Correct Answer: Option B β€” Rainbow
Explanation: A rainbow forms when sunlight is refracted reflected and dispersed through water droplets in the atmosphere splitting white light into its constituent spectral colors.
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