$\begin{array}{1 1}(a)\;\text{Length of major axes }=2\sqrt{5},\text{Length of minor axes }=2\sqrt{7},e=\large\frac{1}{\sqrt 5}\\(b)\;\text{Length of major axes }=2\sqrt{3},\text{Length of minor axes }=2\sqrt{2},e=\large\frac{1}{\sqrt 3}\\(c)\;\text{Length of major axes }=\sqrt{5},\text{Length of minor axes }=\sqrt{2},e=\large\frac{1}{\sqrt 7}\\(d)\;\text{Length of major axes }=2\sqrt{8},\text{Length of minor axes }=2\sqrt{3},e=\large\frac{1}{\sqrt 8}\end{array}$