Q. International Prototype Meter is made of (Solved)
1. Copper
2. Mild steel
3. Cast iron
4. Copper-nickel alloy
5. Platinum-iridium alloy
- e. Platinum-iridium alloy
1. Copper
2. Mild steel
3. Cast iron
4. Copper-nickel alloy
5. Platinum-iridium alloy