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प्रश्न
Name the unit in which the calorific value of a fuel is expressed?
एक शब्द/वाक्यांश उत्तर
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उत्तर
KJ/Kg.
shaalaa.com
Flame
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संबंधित प्रश्न
Make a labelled diagram of a candle flame.
True or False – If False give the correct answer
All fuels form flame.
The substance that does not burn with flame is ______.
The substances which gave very ______ ignition temperature and can easily catch fire with a flame are called ______ substances.
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 |
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?
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.
Why is the candle flame straight?
