Yes, you can definitely post True or False questions or multiple choice questions as long as the answer is not explicitly given away. In order to keep the quiz engaging, it is important to make sure that the questions are not too easy or too difficult. This can be achieved by providing plausible distractors for the multiple choice questions and ensuring that the True or False statements are not too obvious. Additionally, you can also include hints or explanations after each question to provide further context and make the quiz more educational. Overall, the key is to strike a balance between challenging and informative questions to keep the audience engaged.