Name an alloy of
(i) aluminium used in the construction of aircraft.
(ii) Lead used in joining metals for electrical work.

Explanation

### Step-by-Step Solution:

1. **Understanding Alloys**: An alloy is a mixture of two or more metals, combined in a fixed proportion. Alloys have distinct properties that differ from the individual metals, such as increased strength, resistance to corrosion, and improved conductivity.

2. **Identifying the Alloy of Aluminium for Aircraft Construction**:
- The alloy of aluminium commonly used in the construction of aircraft is called **Duralumin**.
- Duralumin is primarily composed of:
- Aluminium: approximately 90-95%
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