Which statement is correct for a fuel cell?

Depict the galvanic cell in which the cell reaction is: $Cu + 2Ag^{+} \to 2Ag + Cu^{2+}$

Give the reactions for the following:
$(i)$ Reactions occurring at the electrodes and the overall redox reaction of a Daniell cell.
$(ii)$ Give the redox and electrode reactions of a $Cu-Ag$ galvanic cell.

In a $Cu-Zn$ cell,.....

Give true $(T)$ and false $(F)$ for following statements :
$(1)$ There is no difference between the galvanic and the electrolytic cell.
$(2)$ In electrolytic cell,anode of galvanic cell is cathode and cathodes are anode.
$(3)$ The flow of current and electron in electrolytic cell is opposite to the galvanic cell.
$(4)$ When $2.0 \ V$ external current in the opposite direction is passed through the Daniell cell,in such condition there is no effect on Daniell cell.

Light can be converted into electricity with the help of a ......... .