The purity of precious metal Gold is measured in Carat. Which of the following refers to a Gold alloy having 75 percent of Gold and rest 25 percent of other metals ?
(A) 18 carat Gold (B) 20 carat Gold (C) 22 carat Gold (D) 24 carat Gold
Which of these is an alloy? A. Brass B. Iron C. Phosphorus D. Silicon
What is the name for a set of marks stamped on gold and silver articles to attest to the genuineness of the metal and the year of testing?