Update README.md

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README.md

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-#### Q. ***What is the difference b/w MongoDB and CouchDB?***
-#### Q. ***What is the difference between MongoDB and MySQL?***
 #### Q. ***What is a covered query in MongoDB?***
 #### Q. ***Mention the command to check whether you are on the master server or not?***
 #### Q. ***Why MongoDB is not preferred over a 32-bit system?***