What are some tech hacks that can be learned in 10 minutes?

If you are in the IT department, you can re-direct, the first page, your colleagues open, to a scary or funny picture; but as Riyas said, it's just a prank not a real hack.

As per my understanding we cannot do any real technical hacks in 10 minutes, all we can do is some pranks which some of our friends may not know. 

It depends in the kind or device but there is alot of third party tools

For android Useres 

• Go to play store
• search for dumpsdrive 
• download it 

* now you have access to all IT and PMP exams dumps

Thanks !