Verbal Reasoning - Mental Ability Questions

In the following question, select the number which can be placed at the sign of question mark(?) from the given alternatives.

Three words in bold letters are given in each question, which have something in common among themselves. Out of the four given alternatives, choose the most appropriate description about these three words.

Vesuvius: Etna: Kilimanjaro

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

aa_ab_ _aaa _a

Select the related word from the given alternatives.
Cotton : White :: Coal : ?

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

PMA, RPE, TSI, VVM, ?

Facing the East, Rahul turned left and walked 10m, then he turned to his left again and walked 10m. He then turned towards his right and went straight to cover 25m. In which direction is he from his starting point?

In the following question, select the related word from the given alternatives.
Sheep : Lamb : : Cow : ?

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