$\sqrt{8}(\sqrt{8} - 1)$ is always :

1. rational

2. irrational

3. whole number

4. natural number

For the given figure length of OA is :

1. $\sqrt{5}$

2. $\sqrt{3}$

3. $\sqrt{5} \text{ or } \sqrt{3}$

4. neither $\sqrt{5}$ nor $\sqrt{3}$

Two irrational numbers between 8 and 11 are :

1. $\sqrt{65} \text{ and } \sqrt{120}$

2. $\sqrt{69}$ and 10.5

3. 8.2 and $\sqrt{125}$

4. 3 and $\sqrt{110}$

State whether the following numbers are rational or not :

(i) $(2 + \sqrt{2})^2$

(ii) $(3 - \sqrt{3})^2$

(iii) $(5 + \sqrt{5})(5 - \sqrt{5})$

(iv) $(\sqrt{3} - \sqrt{2})^2$