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CSS MCQs

Civil Superior Services — Complete MCQ Bank

1,970 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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31
Current Affairs Easy Uploaded: 04 Oct 2026

The 2026 Iran war began on 28 February 2026 after joint airstrikes on Iran by the United States and which other country?

  • AUnited Kingdom
  • BIsrael
  • CFrance
  • DSaudi Arabia
32
Chemistry Easy Uploaded: 04 Sep 2026

Which type of chemical change results in the formation of new substances?

  • AChemical reaction
  • BPhysical change
  • CPhase change
  • DDissolution only
33
Chemistry Medium Uploaded: 04 Sep 2026

What is the term for a molecule with a partial positive and partial negative end?

  • AIonic molecule
  • BNonpolar molecule
  • CPolar molecule
  • DNeutral molecule
34
Chemistry Hard Uploaded: 04 Sep 2026

Which chemical is commonly used as a disinfectant and has the formula NaOCl?

  • ASodium hypochlorite
  • BSodium chloride
  • CSodium chlorate
  • DSodium chlorite
35
Chemistry Hard Uploaded: 04 Sep 2026

What is nuclear fission?

  • ASplitting of a heavy nucleus into smaller nuclei
  • BLoss of an electron from an atom
  • CEmission of alpha particles only
  • DCombining of light nuclei into a heavier one
36
Chemistry Easy Uploaded: 04 Sep 2026

What is the most abundant gas in Earth's atmosphere?

  • ANitrogen
  • BOxygen
  • CCarbon dioxide
  • DArgon
37
Chemistry Medium Uploaded: 04 Sep 2026

What is Avogadro's Law concerned with?

  • APressure and volume relationship
  • BRate of gas diffusion
  • CVolume and temperature relationship
  • DEqual volumes of gases contain equal numbers of moles
38
Chemistry Hard Uploaded: 04 Sep 2026

Which type of hybridization is present in water (H2O)?

  • Asp2
  • Bsp3
  • Csp
  • Dsp3d
39
Chemistry Medium Uploaded: 04 Sep 2026

Which term describes a reaction that proceeds to completion in one direction?

  • AReversible reaction
  • BIrreversible reaction
  • CChain reaction
  • DEquilibrium reaction
40
Chemistry Medium Uploaded: 04 Sep 2026

Which type of chemical reaction involves two compounds exchanging ions to form new compounds?

  • ADecomposition reaction
  • BSingle displacement reaction
  • CCombination reaction
  • DDouble displacement reaction