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प्रश्न
The substances which gave very ______ ignition temperature and can easily catch fire with a flame are called ______ substances.
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उत्तर
The substances which gave very low ignition temperature and can easily catch fire with a flame are called inflammable substances.
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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?
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?
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 ______.
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.
Substances which vapourise during burning produce ______.
Explain the structure of a candle flame.
