Acovalent bond where the electrons are shared equally between the atoms in a binds is called a covalent bond. a covalent bond where the electrons are not shared equally in the bond is called a covalent bond.

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

lol idk man i guess u gotta ask bill nye the science guy