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प्रश्न
What do you observe when a burning candle is covered with an inverted jar.
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उत्तर
The burning of a candle needs a continuous supply of oxygen present in the air. By covering the candle with a jar, the supply of oxygen gets cut, and as there is only a limited quantity of oxygen left, the candle burns for a moment and then goes off completely.
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संबंधित प्रश्न
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Name three greenhouse gases.
Write ‘true’ or ‘false for the following;
Air is a compound.
Tick (√) the correct alternative from the choice given for the following statement.
The substance which accelerates the speed of a reaction without itself undergoing any change is called
The capacity of air to hold moisture depends upon the ______ of the air.
Fill in the blank:
Nitrogen of the air is utilized by plants for formation of _____.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
Name a device which uses wind energy to generate electricity.
______ is important for all living creatures.
