In UET Lahore, an ICS with Physics student can only apply in COmputer Scieces, COmputer Engineering, Computer Science & Engineering, City & Regional Planning (CRP), Architecture and Product & Industrial Design.
Although Computer Engineering is a branch of electronics engineering, hence if you choose computer engineering it would just like you choose electronics and selected computer as a specialization.
Regarding your second query, electrical engineering has two main branches, one is Power, and other is Electronics. In Power, electricity generation and transmission is handled while in electronics all the automatic machinery like computers, mobile phones, and others are produced.
Sohaib Ahmad Khan