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प्रश्न
True or False – If False give the correct answer
All fuels form flame.
विकल्प
True
False
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उत्तर
False
Correct statement: All fuels do not form flame.
APPEARS IN
संबंधित प्रश्न
Make a labelled diagram of a candle flame.
Name the unit in which the calorific value of a fuel is expressed?
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?
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 |
You are provided with three watch glasses containing milk, petrol and mustard oil respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?
Which is the luminous part of the flame?
Explain the structure of a candle flame.
Why is the candle flame straight?
