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प्रश्न
Anu wants to boil water quickly in a test tube. On observing the different zones of the flame, she is not able to decide which zone of the flame will be best for boiling water quickly. Help her in this activity.
उत्तर
Anu should keep her test tube in the outermost zone or non-luminous zone of the flame because it is the hottest zone of a flame and has more temperature.
In the outer zone of a flame, complete combustion of the fuel takes place because there is plenty of air around it so, water in a test tube will boil quickly in this zone.
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संबंधित प्रश्न
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?
Which is the hottest part in the flame of candle ______.
Inner zone of flame : :______, outer zone of flame : :______
Match the following for the flame of a candle.
| Column A |
Column B (zone) |
Column C (colour) |
| (a) hottest part | (iii) outer zone of complete combustion | (x) blue |
| (b) moderately hot | (ii) middle zone of partial combustion | (z) yellow |
| (c) least hot | (i) innermost zone of complete combustion | (y) black |
If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Will it produce a flame?
Write True/False against the following statement and also correct the false statement.
The substances which vaporise during burning, give flame.
Substances which vapourise during burning produce ______.
Match the following:
| 1. | Inner zone | a. | Yellow |
| 2. | Outer zone | b. | Borax powder |
| 3. | Middle zone | c. | Blue |
| 4. | Green flame | d. | Black |
Write a note on flame.
Explain the structure of a candle flame.
