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CSS MCQs

Civil Superior Services — Complete MCQ Bank

106 Questions
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1
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
2
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
3
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
4
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
5
Chemistry Easy Uploaded: 04 Sep 2026

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

  • ANitrogen
  • BOxygen
  • CCarbon dioxide
  • DArgon
6
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
7
Chemistry Hard Uploaded: 04 Sep 2026

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

  • Asp2
  • Bsp3
  • Csp
  • Dsp3d
8
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
9
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
10
Chemistry Easy Uploaded: 04 Sep 2026

Which gas is released when metals react with dilute acids?

  • AHydrogen
  • BOxygen
  • CNitrogen
  • DCarbon dioxide