Which variety of coal contains recognizable traces of the original plant material ?
1). Anthracite
2). Lignite
3). Peat
4). Bitumen
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1. The most abundant element in the human body is
2. ______ decreases the rate of setting of cement.
3. Which of the following is ozone depleting pesticide ?
5. Hydrogen is not found In atmosphere because
6. The rubbing surface of a matchbox has powdered glass and a little red ________________.
7. Galvanised iron is made by coating iron with
8. Solder metal is an alloy of
9. German silver is an alloy of
10. Which type of radiations are absorbed by the upper layer of the atmosphere