Central Board Of Secondary Education [CBSE] — unclear question in question paper

Today was the economics paper of calss 12. I received set 1 in paper, one of the question (Question number 9) was that according to keynsian theory full employment can never exist in an economy. Many are saying the answer to be true. But according to me the answer must be false because :1) in bookish sense full employment can exist in an economy, 2) full employment can also exist if govt make effort for it, 3) according to keynes it is a special case. If the answer is true then the question must me full employment can never exist in actual. The examiner must have used the word in actual in last.