Question

When sand is poured over some burning material, the fire goes off. It is because:

• A. the ignition temperature is brought down by sand
• B. supply of air is cut off
• C. sand spreads easily
• D. all of the above

Answer 1

Answer: (B)

supply of air is cut off

The process of burning takes place only in the presence of air. When sand is poured over some burning material, it covers the material and cuts the supply of air. As soon as air is unavailable, the material stops burning and, the fire goes off. So option B is correct.