You can share your quiz using a URL easily so other teachers can import it quickly. Here's how to do that:
Click on Quizzes:
In the More menu, click on Share (the options will all show in one line if you're browser window is large enough):
Copy the quiz URL and share it with your colleagues. Ask your colleague to login to their Socrative account and once they open the link, they will automatically get a copy of the quiz!