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Q78 (CISF/2020) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which one of the following substances does not belong to class 'B' fire ?

Result
Your answer: —  ·  Correct: A

Explanation

Fire classifications are based on the type of fuel involved. According to standard fire safety norms (such as IS 15683 in India):

  • Class A: Fires involving ordinary combustible materials like wood, paper, cloth, and solid chemicals like Sulphur.
  • Class B: Fires involving flammable liquids or liquefiable solids. This includes Alcohol, Solvents, Paint, petrol, and grease.

While sulphur can be molten when heated, it is fundamentally a combustible solid and is categorized under Class A. In contrast, alcohol, solvents, and paints are classic examples of flammable liquids that fall strictly under Class B. Therefore, Molten Sulphur is the substance that does not belong to Class B.

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