Which one of the following is known as the brown coal ?
1). Anthracite
2). Bituminous
3). Coke
4). Lignite
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1. The BOD values of water indicate the
2. The purest form of water is
3. The presence of ozone in the stratosphere is responsible for
4. At low temperature, Lead behaves as a :
5. Hydrogen bomb is based on the principle of
6. Which of the following is a monoatomic gas
7. The anode of a dry cell is made up of
8. Addition of suitable impurities into semiconductor, is called
10. Dry ice is