Hello,

Yes, filling two bubbles for one answer on an OMR sheet can lead to rejection or scoring errors in board exams. It will not lead to total rejection but the marks will not be considered for that one particular question. It's important to follow the instructions carefully and mark only one bubble per question to ensure accurate scoring and avoid any potential issues with your OMR sheet. Please always double check your answers while filling out the sheet can help prevent mistakes.

Hope this helps,

Thank you