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प्रश्न
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
पर्याय
catalyst
pollutant
fuel
none of the above
उत्तर
catalyst
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संबंधित प्रश्न
State four steps to be taken to control air pollution.
Describe a simple experiment with the help of a diagram to show that Air is highly compressible
______ soil has pH 7.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
What is global warming?
The layer of air around the earth is known as ______.
Match the following:
| 1. | Layer of air | a. | Hand fan |
| 2. | Electrical energy | b. | 21% |
| 3. | Nitrogen | c. | Windmill |
| 4. | Oxygen | d. | Atmosphere |
| 5. | Palm Trees | e. | 78% |
Which of the following statements is incorrect?
Wind does not help in the movement of which of the following?
Match the items of Column I with the items of Column II
| Column-I | Column-ll | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of airflow |
| (e) | Wind | (v) | Prevent dust particles |
