It is possible to have all true or all false answers, or an extraordinary imbalance. Read the entire question, not just the first few words. For an answer to be true, every part of it must be true. However, it is not rare. These are words such as all, every, most, some, always, equal, less, more, best, worst.
All roses are red.
Most roses are red. Some roses are red. No roses are red. If there is no penalty for wrong answers, guess at the ones you don't know. By its nature, this kind of question is usually less subtle than other forms of objective tests.