To evaluate the expression \( \frac{r}{q} \) for \( q = 2 \) and \( r = 10 \), we substitute the values into the expression:
\[ \frac{r}{q} = \frac{10}{2} \]
Now, we simplify this:
\[ \frac{10}{2} = 5 \]
Therefore, the simplified answer is:
\[ 5 \]