Which of the following is used in making smoke bombs?
1). Sulphur
2). Phosphorus
3). Hydrogen
4). Carbon
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1. The Bhopal gas tragedy was caused by the gas
2. Global warming is mainly due to accumulation of
3. Among the fuels given below, the one with highest calorific value is
4. Which gas is used as fire extinguisher?
6. The major constituent of air is
7. Which of the following could be used as fuel in propellant or rockets ?
8. The most common cause of pollution of air is
9. 'Vinegar' is a commercial name of
10. Steel contains