In addition to specific heat capacity and density, could yo use another physical property such as color to determine the identity of a metal?

The answer to your question is below

Explanation:

Melting point is the temperature at which solid changes into liquid.

Boiling point is the temperature at which a liquid changes into a gas.

Viscosity is a measure of the resistance of a liquid to flow.

Solubility is a property of a solid to dissolve in a liquid.

Conductivity is a measure of the ease at which an electric charge flows through a material.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current