Verbal Reasoning - Mental Ability Questions

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Nightwalker

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

ajs , gpy , ? , sbk , yhq

A and B start from the same point. A cycles 10 km South, then turns to her right and cycles 9 km. B cycles 2 km North, then turns West and cycles 15 km, then turns to her left and cycles 12 km. Where is B with respect to A now?

Select the missing number from the given responses:

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

p_rpq_rp_r_r

From the given alternatives, select the word which CANNOT be formed using the letters of the given word.

Superannuated

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

ONU, NKP, MHK, LEF, ?

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

7, 13, 21, 31, 43, 57, ?