Liam Vincent went closest to breaking the deadlock with a shot which struck the inside of the far post, while Anthony Scully had a goal ruled out for offside.
Yet the opening 45 minutes finished goalless ahead of a scheduled 11 changes at half-time as Mousinho utilised 22 members of his playing squad.
There were some encouraging displays and here are our player ratings for the first half...
9. Koby Mottoh - 7
A couple of great deliveries from the right and very direct down the right, using his pace and drive. A plus point during his time on pitch. Photo: Jason Brown
10. Anthony Scully - 6
Asked to play centrally in attack and had a goal ruled out for offside following Pack’s pass, yet couldn’t get involved enough and often on the periphery. Photo: Portsmouth FC
11. Liam Vincent - 7
Bright and energetic down the left flank. Hit the inside of the far post with a left-foot shot following Lowery’s cross-field pass and later had another great chance from Mottoh’s delivery. Photo: Jason Brown