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प्रश्न
The ______ temperature at which a substance catches fire is called its ______ temperature.
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उत्तर
The lowest temperature at which a substance catches fire is called its ignition temperature.
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संबंधित प्रश्न
Which is the hottest part in the flame of candle ______.
True or False – If False give the correct answer
All fuels form flame.
If 4.5kg of fuel is completely burnt and amount of heat produced stands measured at 1, 80,000 KJ what is the calorific value.
Picture based question
Arul and Aakash were doing an experiment in which water was to be heated in a beaker. Arul kept the beaker near the wick in the yellow part of candle flame. Aakash kept the beaker in the outer most part to the flame. Whose water will get heated in a shorter time?
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The substance that does not burn with flame is ______.
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| 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 |
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Middle zone is the hottest zone of a flame.
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| 1. | Inner zone | a. | Yellow |
| 2. | Outer zone | b. | Borax powder |
| 3. | Middle zone | c. | Blue |
| 4. | Green flame | d. | Black |
Explain the structure of a candle flame.
