Coding Decoding Letter Based Mock Tests

If "DESPAIR" is written as "DFSQBJK", how is "LIFE" written in that code?

In a certain code language, if "STUDENT" is written as "UVWPGVF", how will "TEACHER" be written in the same code?

In a certain code language, "cricket is a sport" is written as "ni sa ti ra", "sport is fun" is written as "sa ti ga", "cricket is exciting" is written as "ni sa la", and "fun is exciting" is written as "ti la ga". What is the code for "exciting"?

In a certain code language, if "MONKEY" is written as "XDJMNX" then how will "CHEAT" be written in that code language?

If "PENCIL" is coded as "RGEPMN" then "ERASER" is coded as:

In a certain code, "COMPUTER" is written as "DPNQVUFS". How is "KEYBOARD" written in that code?

In a certain code language, if COMPUTER is written as RFUVQNPC, how is MEDICINE written in that code language?

If "BOOK" is written as "CPPL", how is "FILE" written in that code?