Which one of the following substances is not a source of 'A' class

Which one of the following substances is not a source of ‘A’ class fire?

Wood

Stainless steel

Paper

Jute

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CISF-AC-EXE – 2019

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‘A’ class fires involve ordinary combustible materials such as wood, paper, cloth, rubber, and certain plastics. These materials burn by forming embers. Stainless steel (B) is a metal alloy known for its resistance to rust and corrosion, and it is highly fire-resistant. It does not act as a fuel source for a Class A fire (or typically any other fire class, except possibly in highly specialized, extreme conditions involving metal fires – Class D – which stainless steel isn’t part of in standard classifications). Wood (A), Paper (C), and Jute (D) are all common examples of Class A combustible materials.

– **Class A fires:** Solid combustibles (wood, paper, textiles).
– **Class B fires:** Flammable liquids and gases.
– **Class C fires:** Energized electrical equipment (note: US standard, in some other systems it’s combustible gases).
– **Class D fires:** Combustible metals (magnesium, titanium, sodium, potassium).
– **Class K/F fires:** Cooking oils and fats.
– Stainless steel is a non-combustible material.

Different types of fire extinguishers are rated for different classes of fires. For Class A fires, water-based extinguishers or dry chemical extinguishers are often used.

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