If you have these questions in MS Word, you can replace the Paragraph mark (Crlt+p or ^p, which is equivalent to an Enter hit) with Line mark (Ctrl+l, or ^l, equivalent to Shift+Enter hit) that will retain the style format of the Question type () or the answers (either correct or incorrect).
The advantage of this method is that you can quickly format and upload these questions to Moodle question bank. The disadvantage is that the format of the paragraph doesn't look good, esp. if the question is a long text that comprise several paragraphs.
To overcome this, you need to re-edit these questions directly in Moodle Quiz Module (hitting Enter to create spacing between paragraphs of question texts.
Another way is to add these questions manually on Moodle Quiz module. However, this would take much more time to do with this method.