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CSS MCQs

Civil Superior Services — Complete MCQ Bank

106 Questions
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101
Chemistry Medium Uploaded: 14 Jul 2026

Which element is essential for the structure of DNA and RNA molecules alongside carbon hydrogen oxygen and nitrogen?

  • ASulfur
  • BCalcium
  • CIron
  • DPhosphorus
102
Chemistry Medium Uploaded: 14 Jul 2026

Which chemical process is used to extract metals from their ores using carbon or electrolysis?

  • AReduction
  • BOxidation
  • CNeutralisation
  • DChromatography
103
Chemistry Medium Uploaded: 14 Jul 2026

Which type of chemical bond exists between water molecules causing its unusually high boiling point?

  • ACovalent bond
  • BHydrogen bond
  • CIonic bond
  • DVan der Waals force
104
Chemistry Medium Uploaded: 14 Jul 2026

Which isotope of carbon is used in radiocarbon dating?

  • ACarbon-12
  • BCarbon-13
  • CCarbon-11
  • DCarbon-14
105
Chemistry Medium Uploaded: 14 Jul 2026

What is an isotope?

  • AAtoms of different elements with the same mass
  • BAtoms of the same element with different numbers of protons
  • CAtoms of the same element with the same number of protons but different neutrons
  • DAtoms of different elements with the same electrons
106
Chemistry Hard Uploaded: 14 Jul 2026

Which element has the highest electronegativity on the Pauling scale?

  • AOxygen
  • BChlorine
  • CNitrogen
  • DFluorine