38) Which is a type of electro-deposition in which metal is deposited onto an electro conductive surface and is built up into a rigid structure and reproduced it, after getting the desired geometry.

39) In Alkaline degreasing, the main reaction that helps to remove oil is

40) A standard Chromium plating electrolyte consists of Chromic acid and

41) 1 mil = _____ micrometer

42) The number of units in one mole of any substance is known as