Normally, it is considered that after selecting required number of employees, appointing authority keeps a waiting list.
The candidates in waiting list have normally no right to appointment. But suppose, if some appointed candidates, do not turn up to accept jobs. Then, the persons next in waiting lists can ask that they may be appointed.
For more details, please see Manoj Manu Case, Supreme Court Judgement dated 12/8/13, reported in 2013(12)SCC 171
Haresh Raichura
11/6/2014