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| Q. |
A fuse wire is made of: |
| A. | an alloy of tin and copper |
| B. | an alloy of tin and lead |
| C. | an alloy of tin and aluminium |
| D. | an alloy of nickel and chromium |
| Answer» B. an alloy of tin and lead | |
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Explanation: Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).Q.42) Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of – |
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