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प्रश्न
Write True/False against the following statement and also correct the false statement.
The substances which vapourise during burning, give flame.
विकल्प
True
False
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उत्तर
This statement is True.
Correct Statement:
The substances that vaporise during burning produce flames. When a fuel is heated, it undergoes vaporization and the vapours mix with oxygen in the air to combust, producing a flame. This is why liquid fuels like petrol, kerosene and alcohol give off flames when they burn, as they vaporise before combustion.
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संबंधित प्रश्न
Make a labelled diagram of a candle flame.
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?
True or False – If False give the correct answer
All fuels form flame.
Inner zone of flame : :______, outer zone of flame : :______
Name the unit in which the calorific value of a fuel is expressed?
The ______ temperature at which a substance catches fire is called its ______ temperature.
The substances which vaporise during ______ give flame.
Match the following for the flame of a candle.
| Column A |
Column B |
Column C |
| (a) hottest part | (i) innermost zone of unburnt wax vapours | (x) blue |
| (b) moderately hot | (ii) middle zone of partial combustion | (y) black |
| (c) least hot | (iii) outer zone of complete combustion | (z) yellow |
Write True/False against the following statement and also correct the false statement.
Middle zone is the hottest zone of a flame.
Explain the structure of a candle flame.
