Lead pencil contains
1). lead
2). ferrous sulphide
3). lead sulphide
4). graphite
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2. Why is water not suitable for putting out a petrol fire ?
3. Ozone layer of atmosphere absorbs:
4. Iron filings can be separated from a heterogeneous mixture using the technique of :
5. Which amidst the following is not a gem stone ?
6. Stains of rust on clothes can be removed by :
7. In nuclear raeactors the speed of neutrons is slowed down by -
8. Select the one which is not a mixture:
9. Milk is a