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I have a couple of suggestions for you.<br />
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First off it's worth saving the IP address of the user when you save their answers to the database. That way you can see if someone has filled out the questionaire more than once. Bear in mind that more than one person might access it from the same location, so don't automatically ignore them.<br />
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Make sure your multiple choice questions have an option that is &quot;I don't know&quot; or something similar which is preselected. I have seen many times forms like this that have the first answer selected as default, and if someone submits you don't know if they selected the answer or if they simply did nothing.
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I have a couple of suggestions for you.

First off it's worth saving the IP address of the user when you save their answers to the database. That way you can see if someone has filled out the questionaire more than once. Bear in mind that more than one person might access it from the same location, so don't automatically ignore them.

Make sure your multiple choice questions have an option that is "I don't know" or something similar which is preselected. I have seen many times forms like this that have the first answer selected as default, and if someone submits you don't know if they selected the answer or if they simply did nothing.

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I have got a simple questionaire hosted on the internet. It simply has a list of questions with ten multiple choice answers per question. I am looking for to ensure that the data is as genuine as possible, i.e. ensuring users only answer the question once. This is my main concern, but any other methods people use to ensure the quality of their data gained via the internet I would be interested in.<br />
<br />
The website uses a SQL database, and uses PHP as well.<br />
<br />
Any ideas, and lets hear them
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I have got a simple questionaire hosted on the internet. It simply has a list of questions with ten multiple choice answers per question. I am looking for to ensure that the data is as genuine as possible, i.e. ensuring users only answer the question once. This is my main concern, but any other methods people use to ensure the quality of their data gained via the internet I would be interested in.

The website uses a SQL database, and uses PHP as well.

Any ideas, and lets hear them

Website Data Integrity

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

MySQL is an open source, relational database management system that runs as a server providing multi-user access to a number of databases. Acquired by Oracle in 2009, it is frequently used in combination with PHP installations, powering most of the WordPress installations.

MySQL Server

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.