Polls are used for asking 1 quick multiple-choice question.
If you want to ask more than 1 question you can either create a few polls and embed them on your site one after the other, create a survey or create a multi-poll.
With surveys, you can create multiple questions of different types (e.g. multiple choice, open ended, etc) in the same item. However users won't see what other users voted for since surveys are built primarily for collecting data.
With multi-polls, you group a few polls together and they are displayed one after the other with a pre-set delay.