Option Buttons-How do you get for example the option button to stay

How do you get for example the option button to stay on for more than one example

eg:

Fo a set of questions

1.? Yes (Option button ) No (Option button)

2.? Yes (Option button ) No (Option button)

3.? Yes (Option button ) No (Option button)

if i click no on question 1 for example that works fine, but then if i click no for question too it then removes from question 1 to question too rather than staying on both..if that makes sense at all.

Cheers

Andy