Write two alloys of copper and their uses.

Write two uses of concave and convex lens

What are alloys ?

Two wires of equal length, one of copper and the other of manganin [an alloy] have the same thickness. Which one can be used for i] electrical transmission lines ii] electrical heating devices? Why?

Write the composition of copper matte.

Write the composition of copper matte.

German silver is an alloy of copper and :

Write any two uses of yeast.