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CSS MCQs

Civil Superior Services — Complete MCQ Bank

1,970 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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921
Biology Easy Uploaded: 06 Aug 2026

Which molecule carries genetic information in most organisms?

  • ARNA
  • BProtein
  • CLipid
  • DDNA
922
Chemistry Medium Uploaded: 06 Aug 2026

What is the term for a solution that resists changes in pH?

  • ASaturated solution
  • BBuffer solution
  • CColloid
  • DSuspension
923
Chemistry Medium Uploaded: 06 Aug 2026

Which of these is a strong base?

  • ASodium hydroxide
  • BAmmonia
  • CAcetic acid
  • DCarbonic acid
924
Chemistry Medium Uploaded: 06 Aug 2026

What is the chemical name for rust?

  • AIron nitrate
  • BIron sulfide
  • CIron carbonate
  • DIron oxide
925
Chemistry Medium Uploaded: 06 Aug 2026

Which of the following is an alkali metal?

  • APotassium
  • BCalcium
  • CMagnesium
  • DAluminum
926
Chemistry Medium Uploaded: 06 Aug 2026

What is the term for a substance that speeds up a reaction without being consumed?

  • AReactant
  • BSolvent
  • CProduct
  • DCatalyst
927
Chemistry Medium Uploaded: 06 Aug 2026

Which of these elements is a halogen?

  • ANeon
  • BChlorine
  • CSodium
  • DCalcium
928
Chemistry Medium Uploaded: 06 Aug 2026

What is the pH range of a strong acid?

  • A11-14
  • B4-6
  • C7
  • D0-3
929
Chemistry Easy Uploaded: 06 Aug 2026

Which of these is an example of a physical change?

  • ABurning wood
  • BRusting iron
  • CBaking a cake
  • DMelting ice
930
Chemistry Hard Uploaded: 06 Aug 2026

What is Avogadro's number approximately equal to?

  • A9.8 x 10^23
  • B3.14 x 10^23
  • C6.022 x 10^23
  • D1.6 x 10^23