Question

A student lights a candle and keeps a glass over it. He notices that the candle puts off after some time. What is the reason for his observation?

Formation of heat in the glass

The absence of oxygen in the glass

The absence of carbon dioxide in the glass

The presence of oxygen in the glass

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Answer 1

Answer:

b - absence of oxygen in glass

Answer 2

The reason why the candle puts off after some time when a glass is placed over it is due to the absence of oxygen in the glass.

The flame of the candle uses up the oxygen present in the glass, as it requires oxygen to sustain the combustion process.
As the candle continues to burn, the level of oxygen in the glass decreases, and eventually, the oxygen is depleted. This results in the flame being extinguished, as fire cannot burn without oxygen.
The presence of the glass further restricts the flow of oxygen to the flame, causing it to burn at a slower rate and eventually go out. Therefore, the absence of oxygen in the glass is the main reason for the observation made by the student.

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