making the default value of radio buttons to NO

making the default value of radio buttons to NO

I have an input radio buttons like this

<input type="radio" name="radio1" class="abc" checked>No

<input type="radio" name="radio1" class="abc">Yes

So i want to make it checked once i am done with procesing, currently it is just removing the attribute and keeping both empty

i tried using.reset() event but it is not working!

Can anyone guide