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CSS MCQs

Civil Superior Services — Complete MCQ Bank

127 Questions
Exam Preparation Guide

How to prepare for CSS

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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121
Physics Medium Uploaded: 13 Jul 2026

What is the process by which an unstable atomic nucleus spontaneously emits radiation?

  • AFission
  • BFusion
  • CDiffraction
  • DRadioactive decay
122
Physics Hard Uploaded: 13 Jul 2026

What is the unit of magnetic flux density?

  • ATesla
  • BWeber
  • CHenry
  • DFarad
123
Physics Hard Uploaded: 13 Jul 2026

Which phenomenon explains the formation of mirages in deserts?

  • AReflection of light
  • BDiffraction of light
  • CTotal internal reflection due to air density layers
  • DDispersion of light
124
Physics Hard Uploaded: 13 Jul 2026

What is the angle of incidence when a ray of light undergoes total internal reflection?

  • ALess than the critical angle
  • BEqual to 90 degrees
  • CGreater than the critical angle
  • DEqual to 45 degrees
125
Physics Medium Uploaded: 13 Jul 2026

Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

  • ARefraction
  • BReflection
  • CDiffraction
  • DDispersion
126
Physics Medium Uploaded: 13 Jul 2026

Which law of thermodynamics states that heat naturally flows from a hotter body to a cooler body?

  • AFirst Law
  • BZeroth Law
  • CSecond Law
  • DThird Law
127
Physics Medium Uploaded: 13 Jul 2026

Which law of thermodynamics states that energy cannot be created or destroyed only converted from one form to another?

  • AZeroth Law
  • BSecond Law
  • CThird Law
  • DFirst Law