German silver used for making utensils is an alloy of
1). copper silver nickel
2). copper zinc nickel
3). copper zinc aluminium
4). copper nickel aluminium
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1. Person who is colour-blind cannot distinguish between
2. Which of the following green house gases has the greatest heat-trapping ability?
3. "Firefighting clothes" are made from
4. Ethanol containing 5%. water is known as
6. Setting of plaster of Paris involves
8. Electrons in the highest energy level of an atom are called ________.
9. Which of the following is used to remove rust stains on cloth?
10. Which of the following vegetable oils does not contain essential fatty acids ?