I am From PCB Stream in Class 12th But now I want to pursue BBA Futher from CUET but which subject do I choose in domain

No, you cannot apply for the Panjab University BA LLB Entrance Exam if you have failed your Class 12th exams, as passing 10+2. You need minimum 45 per cent marks from a recognised board.

Yes, it is important for students to align the CUET UG subjects with the subjects studied in class 12th. Top central universities like Delhi University, does not accept CUET subject scores which have not been studied by student in class 12th. While selecting CUET subjects candidates must make sure that CUET subjects must closely or completely align with the subjects studied in class 12th. Failing which, candidate will be disqualified for admission despite a good score.

Not really. The electric dipole moment vector directs or points from the negative charge to the positive charge. But the electric field lines that a dipole creates will point away from the positive and move to the negative charge.

Yes, the cube, which is a closed surface containing only one electric dipole will make electric flux zero. This follows Gauss's Law when the total charge inside it is zero. The field lines entering the surface will exit, and that would result in zero net flux. 

The magnitude of each charge and the distance that separates them.