11. Manganin is an alloy of :
(a) copper, manganese and nickel
(b) copper and manganese
(c) manganese and nickel
(d) manganese, aluminium and nickel
12. Copper is completely miscible with :
(a) nickel
(b) gold
(c) hydrogen
(d) lead
13. Brass is an alloy of :
(a) copper and zinc
(b) copper and iron
(c) copper and Aluminium
(d) copper and tin
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