An example of semiconductor is
1). Germansilver
2). Germanium
3). Phosphorous
4). Arsenic
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1. Cement containing excess amount of lime
3. The atmospheric gas that is mainly responsible for green house effect :
4. What material is used to make electric heater coil ?
6. Which of the following is the main nitrogenous waste in humans ?
7. Bauxite is used as raw material by which industry ?
8. The metal that is used as a catalyst in the hydrogenation of oils is
9. The gas that is used in the manufacture of vanaspati ghee is :