COLOURING TECHNIQUES - Practice Mode

1) Which is the name of chemical used for etching in economical way?

Alkaline ammonia Sulpuric - Hydrogen peroxide Cupric chloride Ferric chloride

Correct Answer: Ferric chloride

2) Which is the name of process that removing of copper present in the unmasked portion in PCB?

Etching Desoldering Filing Grinding

Correct Answer: Etching

3) Which is the reason that PCB taken out of the solution is to be cleaned by fresh water?

To clean surface To stop further etching To check condition of copper To remove the paints

Correct Answer: To stop further etching

4) Which is the composition of solution Ferric chloride?

Iron and Flouride Iron and Chromium Iron and Cadmium Iron and Chlorine

Correct Answer: Iron and Chlorine

5) What is the chemical formula of aluminium?

A AM Al AN

Correct Answer: Al

Explanation:

Chemical formula of aluminium is "Al".

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