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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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61
Chemistry Medium Uploaded: 04 Sep 2026

According to Arrhenius theory, an acid is a substance that:

  • AProduces H+ ions in water
  • BProduces OH- ions in water
  • CAccepts protons
  • DDonates electron pairs
62
Chemistry Hard Uploaded: 04 Sep 2026

What is the percentage composition of oxygen in water (H2O)?

  • A66.7%
  • B11.1%
  • C88.9%
  • D50%
63
Chemistry Easy Uploaded: 04 Sep 2026

One mole of any substance contains how many particles?

  • A3.011 × 10^23
  • B6.022 × 10^22
  • C6.022 × 10^23
  • D1.204 × 10^24
64
Chemistry Easy Uploaded: 04 Sep 2026

Which state of matter has a definite volume but no definite shape?

  • ASolid
  • BLiquid
  • CGas
  • DPlasma
65
Chemistry Medium Uploaded: 04 Sep 2026

According to the kinetic theory of gases, gas particles are considered to have:

  • AFixed volume
  • BVariable mass
  • CNegligible volume
  • DLarge volume
66
Chemistry Medium Uploaded: 04 Sep 2026

What is the bond order of the nitrogen molecule (N2)?

  • A3
  • B4
  • C2
  • D1
67
Chemistry Easy Uploaded: 04 Sep 2026

What type of bond forms between metals and non-metals?

  • AHydrogen bond
  • BMetallic bond
  • CIonic bond
  • DCovalent bond
68
Chemistry Medium Uploaded: 04 Sep 2026

What is the modern periodic law based on?

  • AAtomic mass
  • BDensity
  • CAtomic number
  • DAtomic volume
69
General Knowledge Hard Uploaded: 02 Sep 2026

The Boston Tea Party took place in which year?

  • A1765
  • B1776
  • C1781
  • D1773
70
General Knowledge Hard Uploaded: 02 Sep 2026

Which African country is completely surrounded by South Africa?

  • AEswatini
  • BBotswana
  • CLesotho
  • DNamibia