Coding And Decoding Mock Tests

In a certain code language, "PAPER" is written as "OZODQ". How is "STUDENT" written in that code language?

If CAT is coded as ECV, how is DOG coded in the same language?

If MANGO is coded as OCPIQ, how is PEAR coded?

If in a code language, CLOCK is written as KCOLC, how is PUZZLE written in that code?

In a certain code language, "MACHINE" is written as "NBJOHDF". How will "ENGLISH" be written in that code?

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

If APPLE is coded as 3%#$$, how is MANGO coded when M=1, A=2, N=4, G=6, O=5?

In a certain code language, each letter of a word is shifted one position forward. If "COMPUTER" is written as "DPNQVUFS", how is "NEXTDAY" written in that code language?