Dear jayasree

You have done mistake and as you know answer sheets are read by OMR optical character reader and it can read only one bubble at a time for a particular question.so two filled bubbles will be considered as invalid.In this condition your questions will be neither Right nor wrong It will be marked as unattempted so you get no marks for that particular question.

From next time If you wil be appear in any such type of exam You should be carefully fill the OMR sheet because every single marks matter in your selection.

Best of luck!