What changes were made by the Constitution (Fifteenth Amendment) Act, 1963 to the Public Service Commission's terms of office?
The Constitution (Fifteenth Amendment) Act, 1963 made the following changes to the Public Service Commission's terms of office:

1. Inserted a new clause "ins. by the Constitution (Fifteenth Amendment) Act, 1963, s. 11 (w.e.f. 5-10-1963)" which likely added or amended specific provisions related to the terms of office for members of Public Service Commissions. However, without further context or details from the source document, it is not possible to determine exactly what changes were made.