1- what is difference between interview and personal hearing ?

2- according to following data what does 1+1(P) stands for ? what is meant by (FS-11) ? there are 26 candidates why they only called 2 candidates?

PLACE OF INTERVIEW
FPSC Headquarters,
Aga Khan Road, Sector F-5/1,
Islamabad.
F.4-158/2012-R(FS-II)
Twenty Six Inspectors (BS-16), ASF. Defence 1+1 (P)

3-according to the following data, why they only called 2 candidates? what about the rest of candidates ?
FPSC Provincial Office,
31-Civic Centre, Mustafa Town,
Wahdat Road,
Lahore
F.4-158/2012-R
Twenty Six Inspectors (BS-16), ASF. Defence 2