How to check if a radio button in each group is checked in jQuery?

Multiple groups or radio buttons

<h1>Question 1</h1>
<input type="radio" name="radio1" value="false" />
<input type="radio" name="radio1" value="true" /> 

<h1>Question 2</h1>
<input type="radio" name="radio2" value="false" />
<input type="radio" name="radio2" value="true" />

How can I check in jQuery that a radio button in each group is checked?

Thank you.