Verbal Reasoning - Mental Ability Questions

In the following question, select the related word pair from the given alternatives.
Canada : Ottawa : : ? : ?

In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

462 = 551
398 = 487
856 = ?

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

MN_NOM_OPM_OP_

Rajiv is the brother of Arun. Sonia is the sister of Sunil. Arun is the son of Sonia. How is Rajiv related to Sunil?

If 8 θ 12 δ 6 = 60 and 13 θ 15 δ 11 = 74, then 18 θ 21 δ 15 = ?

In the following question, select the related word from the given alternatives.
Book : Pages : : Continent : ?

Find the next in this series:
YC3, XF6, WI9, ........

If 6#30=5; 8#24=3; 7#28=4; then what is the value of 8#40=?