2012 · Q33
The material used for electric fuse is an alloy of tin and lead. This alloy should have :
General SciencePhysics
- AHigh specific resistance and low melting point.
- BLow specific resistance and high melting point.
- CLow specific resistance and low melting point.
- DHigh specific resistance and high melting point.
Explanation
A fuse wire must heat up rapidly under excess current, which needs high specific resistance, and must melt to break the circuit, which needs a low melting point. The tin–lead alloy used for fuses satisfies both requirements. Low resistance or a high melting point would prevent the fuse from operating. Hence option A.