Glowing and positive.

* Boss is a jerk IRL? In the survey, my boss communicates well, is inclusive and respectful.

* Corporate organization is disorganized and ineffective IRL? My answer: Organization is effective in making resources easy to find, and supports us in our projects.

* Are you happy with the office culture? Oh yes! Greatest place ever to work!

The sooner you realize that 1) HR is there to protect the company, not the employee, 2) surveys aren't usually confidential, 3) surveys aren't there to help you, 4) they won't result in any real changes, 5) are most likely used to weed out the malcontents at work when things slow down, the happier you'll be in answering HR surveys.