In Safari, go to www.agoogleaday.com. You may wish to click Add to Homescreen. Read through Google's tips and suggestions before starting to play.
After reading the tips, click Start playing.
The question appears at the bottom of this image, and notice your Google search bar is right at the top of your screen. That's where you can Google to find the answer!
You get points for correct answers, and can hit Next Question when you are ready! Have fun!