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CSS MCQs

Civil Superior Services — Complete MCQ Bank

1,939 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
Chemistry Medium Uploaded: 04 Sep 2026

Which polymer is formed from the monomer ethylene?

  • APolypropylene
  • BPVC
  • CPolyethylene
  • DPolystyrene
22
Chemistry Easy Uploaded: 04 Sep 2026

Which functional group characterizes carboxylic acids?

  • A-CO-
  • B-COOH
  • C-OH
  • D-CHO
23
Chemistry Hard Uploaded: 04 Sep 2026

Which process is used to purify metals using electricity?

  • ARoasting
  • BCalcination
  • CElectrorefining
  • DSmelting
24
Chemistry Medium Uploaded: 04 Sep 2026

In a galvanic cell, electrons flow from:

  • ACathode to solution
  • BAnode to cathode
  • CSolution to anode
  • DCathode to anode
25
Chemistry Medium Uploaded: 04 Sep 2026

Le Chatelier's Principle predicts how equilibrium shifts in response to:

  • AMolecular weight change
  • BExternal stress
  • CCatalyst addition
  • DColor change
26
Chemistry Easy Uploaded: 04 Sep 2026

Which factor does not affect the rate of a chemical reaction?

  • ACatalyst presence
  • BTemperature
  • CConcentration
  • DColor of reactants
27
Chemistry Medium Uploaded: 04 Sep 2026

Which thermodynamic quantity measures the randomness of a system?

  • AEnthalpy
  • BEntropy
  • CInternal energy
  • DGibbs free energy
28
Chemistry Medium Uploaded: 04 Sep 2026

Which law states that heat energy is conserved in all processes?

  • AThird law of thermodynamics
  • BSecond law of thermodynamics
  • CFirst law of thermodynamics
  • DZeroth law of thermodynamics
29
Chemistry Medium Uploaded: 04 Sep 2026

What is a buffer solution?

  • AOnly basic
  • BResists change in pH
  • CAlways neutral
  • DOnly acidic
30
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