The candidates, who also included girls, were later allowed to take the test yesterday and were also compensated for the loss of time, they said.
The institute officials, however, said there was no intention to hurt religious feelings of anyone, and it was part of the measures to check cheating during the examination.
Last year, a cheating racket was busted during the post graduate entrance test conducted by the institute. Students were found copying using hi-tech gadgets, earphones and other miniature electronic devices.
In a statement issued at Amritsar, SGPC President Avtar Singh Makkar said Sikh students were asked to remove their 'kirpan' and 'kada' to gain entry to the examination hall.