1. Find Different Types of Files. Simply add filetype:pdf (or switch pdf to ppt or doc) after your search terms.

2. Find Materials From Educational Institutes. For times when you need a reliable source, add site:edu after your search terms.

3. Use it as a Dictionary. Simply type define:keyword into the search engine.

4. Get the Time. You can find the current time in any location by searching for time location.

5. Find out the Weather. Search for location weather to get the forecast in any location.

6. Find Live Commentary. To get the score of a game or sporting event, type in a keyword, such as cricket, while the game is going on.

7. Do Calculations. You can enter everything from simple arithmetic to trigonometry using the search box. For instance, you can enter 26 * 9000, or sin(90) / cos(90).

8. Convert Currency. Google has an inbuilt currency converter. Just enter 1 USD in EUR (or whatever currency you need).

9. Check Your Stocks. Simply enter stocks: XXXX.

10. Find Images of Faces. To find image results of people only, add imgtype=face to the image URL. For instance, http://images.google.co.in/images?q=happy&imgtype=face.