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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
Air pollution is due to the
विकल्प
cutting of green plants
gases like carbon monoxide, sulphur dioxide, etc.
smoke given out by factories
all of the above
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उत्तर
all of the above
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संबंधित प्रश्न
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
How is air useful to water boats?
State what do you understand by the term ‘air’. Explain its importance to mankind.
With whom should I pair up?
| Group A | Group B | ||
| (1) | Air | (a) | Excretion |
| (2) | Water | (b) | Scattering of light |
| (3) | Soil | (c) | Plasticity |
How is light scattered by the air?
Draw a neat labelled diagram for the following experiment.
To determine the component of air used up in burning, by using phosphorus and a bell jar.
Which of the following statements is incorrect?
Wind does not help in the movement of which of the following?
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
