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.

JI, LK, NM, ?

Select the missing number?

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

IM, JO, KQ, LS, ?

Select the related number from the given alternatives.
-3/7 : 7/3 :: 9/2 : ?

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

ABC, ZYX, DEF, WVU, ?

From the given alternative words, select the word which cannot be formed using the letter of the given word.

IMPRACTICABLE

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