There will be only one correct answer for each question. (The one that PMI says is correct, of course.) Your score for that question is either right or wrong. No partial credit or weighted score is given.
Each question on The PMP Exam has 4 answers: A, B, C and D -> However, only one of these answers is correct.
It is your job to select ONE of these 4 answers as the correct one. There are no questions on the exam where 2 answers are correct. There is only 1 correct answer. (Sometimes there are 2 answers that are similar, and that is when you have to decide which one is the better answer.)
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®