${\mathrm{S}}_1 :$ Potential energy of the two opposite charge systems increases with the decrease in distance.
${\mathrm{S}}_2 :$ When an electron make transition from higher orbit to lower orbit, it's kinetic energy increases.
${\mathrm{S}}_3 :$ When an electron make transition from lower energy to higher energy state, its potential energy increases.
${\mathrm{S}}_4 : 11 \mathrm{eV}$ photon can free an electron from the $1^{\text{st }}$ excited state of ${\mathrm{He}}^{+}-$ion.