Verbal Reasoning - Mental Ability Questions

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
MHZ, NIW, OKT, PNQ, ?

If South-East is changed to North and North-East to West and so on, then what will come in place of South?

In a certain code language, "ENERGETIC" is written as "ETICGENER". How is "CARTRIDGE" written in that code language?

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

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. PR, VX, BD, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

XPK, VNJ, TLH, RJE, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
ZA, TG, NM, ?

Punit starting from point R walked straight 10 km west, then turned right and walked 12 km and again turned right and walked straight 7 km. In which direction is he from point R?