First of all visit the official website of Bihar Board .  Click on the option of circular Latest circular .  Click on Bihar Board Intermediate Annual Exam Answer Key 2021 option  A new page will open in front of you.  Here you enter your Roll Number and Role Code .  Select the subject for which you want to download the physics objective answer key .  As an example: - physics  As soon as you select the subject, Bihar Board of Physics Answer key opens in front of you.