Coding and Decoding Questions

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
c_e_cd_f_d_f

If BAPTISM is coded as DCRVKUO, then how will TIN be coded as?

In a certain code language, "MATCH" is written as "NYWYM" and "BOARD" is written as "CMDNI". How is "PRINT" written in that code language?

In a certain code language, "DISORDER" is written as "OSIDREDR". How is "PRACTICE" written in that code language?

In a certain code language the word EXAMPLES is written as EMAXSEPL. How will the word BUOYANCY be written in that language?

If 9 $ 4 = 17 and 1 $ 5 = 10, then 3 $ 6 = ?

If 3*1 = 20, 6*1 = 50 and 2*6 = -40, then find the value of 5*8 = ?

In a certain code language, “FRAME” is written as “79635” and “TOWEL” is written as “21854”. How is “WORM” written in that code language?