Question

If you fix a burning candle on a petri dish, it will continue to burn, but when you put an inverted beaker over it, the flame goes off. Why does this happen?

• A. Insufficient nitrogen in the air.
• B. The supply of oxygen is cut off.
• C. Both A and B
• D. None of the above

Answer 1

Answer: (B)

The supply of oxygen is cut off.

If you fix a burning candle on a petri dish, it will continue to burn, but when you put an inverted beaker over it, the flame goes off because the supply of oxygen is cut off. The burning candle uses all the oxygen present inside of the beaker and without oxygen combustion cannot take place.

So, option B is correct.