I have been using this app for more than a month now.as the names indicates this app is from google and we are paid for our opinions.I have earned more than 70rs from this app which I used to buy a game from playstore.most of the time questions are asked on google products like google map, adsense, google drive etc.
Google developed this app so that they can collect opinions directly from their customers and make improvement on it if needed according to the opinions given by people.although survays may not be available all the time which I found as a majour drawback for this app.
The app is having very simple layout and design and also its credited money can be used for google playstore purchases.