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CSS MCQs

Civil Superior Services — Complete MCQ Bank

106 Questions
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31
Chemistry Hard Uploaded: 04 Sep 2026

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

  • A66.7%
  • B11.1%
  • C88.9%
  • D50%
32
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
33
Chemistry Easy Uploaded: 04 Sep 2026

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

  • ASolid
  • BLiquid
  • CGas
  • DPlasma
34
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
35
Chemistry Medium Uploaded: 04 Sep 2026

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

  • A3
  • B4
  • C2
  • D1
36
Chemistry Easy Uploaded: 04 Sep 2026

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

  • AHydrogen bond
  • BMetallic bond
  • CIonic bond
  • DCovalent bond
37
Chemistry Medium Uploaded: 04 Sep 2026

What is the modern periodic law based on?

  • AAtomic mass
  • BDensity
  • CAtomic number
  • DAtomic volume
38
Chemistry Medium Uploaded: 07 Aug 2026

What is the SI unit of amount of substance?

  • AMole
  • BLitre
  • CGram
  • DKilogram
39
Chemistry Medium Uploaded: 07 Aug 2026

Which law states that matter can neither be created nor destroyed?

  • ALaw of Conservation of Mass
  • BLaw of Multiple Proportions
  • CAvogadro's Law
  • DLaw of Definite Proportions
40
Chemistry Hard Uploaded: 07 Aug 2026

Which quantum number describes the shape of an orbital?

  • AAzimuthal quantum number
  • BMagnetic quantum number
  • CSpin quantum number
  • DPrincipal quantum number