Steel contains
1). 12% carbon
2). 5-10% carbon
3). more than 10% carbon
4). no carbon
1. In nuclear reactors graphite is used as a an
2. Petroleum consists of a mixture of
3. Which type of radiations are absorbed by the upper layer of the atmosphere?
4. The percentage of nitrogen present in ammonium sulphate is :
6. Domestic cooking gas consists mostly of
7. Raw materials used for the manufacture of glass are
8. The major harmful gas emitted by automobile vehicles which causes air pollution is