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CSS MCQs

Civil Superior Services — Complete MCQ Bank

27 Questions
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CSS is Pakistan’s premier federal competitive examination. Strong preparation requires conceptual clarity, broad general knowledge and consistent practice across compulsory and optional areas.

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21
Everyday Science Medium

Which type of chemical bond involves the sharing of electrons between atoms?

  • AIonic bond
  • BMetallic bond
  • CCovalent bond
  • DHydrogen bond
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Correct Answer: Option C — Covalent bond
Explanation: A covalent bond forms when atoms share electrons between them to achieve stable electron configurations commonly seen in molecules like water and carbon dioxide.
Submitted by: PaperMCQs
22
Everyday Science Hard

Which planet in the solar system rotates on its side with an axial tilt of about 98 degrees?

  • AUranus
  • BNeptune
  • CSaturn
  • DJupiter
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Correct Answer: Option A — Uranus
Explanation: Uranus has an extreme axial tilt of about 98 degrees meaning it essentially rotates on its side likely caused by a massive collision during the early solar system.
Submitted by: PaperMCQs
23
Everyday Science Hard

Which everyday process explains how noise-cancelling headphones work?

  • AReflecting sound waves outward
  • BAbsorbing sound with foam only
  • CIncreasing inner air pressure
  • DGenerating sound waves that cancel incoming noise
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Correct Answer: Option D — Generating sound waves that cancel incoming noise
Explanation: Noise-cancelling headphones use microphones to detect ambient sound and generate opposing sound waves that cancel out the incoming noise through destructive interference.
Submitted by: PaperMCQs
24
Everyday Science Hard

Which type of radiation has the greatest penetrating power among alpha beta and gamma radiation?

  • AGamma
  • BAlpha
  • CBeta
  • DAll equal
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Correct Answer: Option A — Gamma
Explanation: Gamma radiation has the greatest penetrating power and can pass through dense materials like lead only being significantly blocked by thick lead or concrete shielding.
Submitted by: PaperMCQs
25
Everyday Science Hard

Which part of the nervous system is called the automatic system and controls involuntary body functions like digestion?

  • ASomatic nervous system
  • BCentral nervous system
  • CAutonomic nervous system
  • DPeripheral nervous system
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Correct Answer: Option C — Autonomic nervous system
Explanation: The autonomic nervous system regulates involuntary functions like digestion heartbeat and breathing without conscious effort and is divided into sympathetic and parasympathetic divisions.
Submitted by: PaperMCQs
26
Everyday Science Medium

Which scale measures the hardness of minerals, with diamond being the hardest at 10?

  • ARichter scale
  • BMohs scale
  • CBeaufort scale
  • DKelvin scale
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Correct Answer: Option B — Mohs scale
Explanation: The Mohs hardness scale ranks minerals from 1 to 10 based on their ability to scratch each other with diamond rated at 10 as the hardest naturally occurring mineral.
Submitted by: PaperMCQs
27
Everyday Science Medium

Which everyday item uses the principle of total internal reflection to transmit data as light signals?

  • APeriscope
  • BOptical fibre cable
  • CTelescope
  • DMicroscope
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Correct Answer: Option B — Optical fibre cable
Explanation: Optical fibre cables use total internal reflection to transmit data as pulses of light over long distances with minimal signal loss forming the backbone of modern internet.
Submitted by: PaperMCQs
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