Nexus 7 is recently launched tablet by Google equipped with latest Android 4.1 Jelly Bean. Now, if you want to take screenshot on Nexus 7 then follow the instructions written below to do so.
How to Take Screenshot on Nexus 7
Press and hold “Volume down” + “Power” buttons at the same time for 2 seconds
Taken screenshot will display and you will also hear camera shutter sound and taken screenshot will get saved into Gallery
To open saved screenshot navigate to “Applications” > “Gallery” > “ScreenCapture folder”
Note: You can share your saved screenshots over social networks, MMS, or via Email.