REPAIRING TECHNIQUE - Practice Mode

1) What is the percentage of copper in malachite ore?
Correct Answer: 0.55
2) Which metal is basically an alloy of copper and tin?
Correct Answer: Bronze
3) Why copper is extensively used in electrical cables and appliances?
Correct Answer: Good conductor
4) Which metal is extracted from cassterite?
Correct Answer: Tin
5) Which coupling will have disengaging provision?
Correct Answer: Universal coupling