Section 6(2)(g) in The Bureau of Indian Standards (Recruitment to Scientific Cadre) Regulations, 2002
(g)A candidate, on appointment to the post of Scientist-B through competitive examination, shall furnish a surety bond in the form specified by the Bureau, for serving the Bureau for a minimum period of three years. If he decides to leave the service either by resignation or absence from service without permission earlier than three years from the date of employment, he shall be required to reimburse the Bureau six months' emoluments at the rate last drawn by him unless he has worked for a shorter period in which case he shall be required to reimburse the full amount drawn by him.