Pricing & feature clarification

In the start payment, it says that there is a maximum of 15 questions. Does this mean that I can make only 15 questions or 15 pages with questions?
I want to make 15 questions with video in it, and the user must choose from a pool of 10 images. Below those images, I want following questions which say like rate the video you just saw. And how confident are you. After that, options ticking how did you find the features. Finally any other information you would like to add.
For 1 video question, there will be basically 3 radio button follow up questions with 1 tick box question and a optional form where users can place it.
The last page, I want users to fill in some of their details of themselves when taking the experiment.

About the features, does this questionnaire provide password protection before users carry out the survey? I want to control the amount of users who can take part in the survey. I also don't want anyone to google the survey out of the internet.
Lastly, does the data collection include ability to export into spredsheet? I need data which I can easily make use and not of data which I need to manually place in second time around.
Can this site provide abilities like questionmark perception? I see its easy to use, but I am not sure about how good it is, since I cannot try out the add file feature.
Thank you
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