New Delhi, March 10 -- The CBSE Class 12 Mathematics exam, held on March 9, has hogged the limelight after several students took to social media to show that scanning the QR code on the exam paper led them to an age-old Internet prank.

The popular Internet prank, known as "rickrolling", tricks users into opening the music video for the hit song by Rick Astley instead of the content they expect. It originated in the mid-2000s.

In the video going viral on social media, a Class 12 student showed on camera how scanning the QR code on the CBSE Maths paper opened a YouTube video for Rick Astley's "Never Gonna Give You Up."

The video went viral quickly on every social media forum, and the picture of the QR code was also widely shared for user...