If you are planning to apply for a master's degree in the U.S., but in a field that is different from your bachelor's degree, it would require to prepare a little extra than other students. The universities won’t ever compromise on the entry requirements, but they always would allow students to apply if they have proper pre-requisites in place.
Have a look at this short video on what Mr. Patriek Karayil, an MIT graduate and a Former Vice President of U.S. News Global Education, has there to offer as guidance in this case to all the aspiring students.