Verbal Reasoning - Mental Ability Questions

If (2)#* 4 = 2 and (4)#* 4 = 16, then what is the value of A in (6)#* A = 18?

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

a_d_bd_ab_dd

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

OP, RS, VW, ? , GH

Select the number which can be placed at the place of ? in the following question

Arrange the given words in the sequence in which they occur in the dictionary.
i. Drama
ii. Dramatical
iii. Dramaticism
iv. Dramality
v. Dramatise

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
24 x 6 - 8 + 2 = ?

If 'HARBOUR' is written as 'IBSCPVS' , how is 'HABITAT' written in that code?

Choose the related word/letters/number from the given alternatives.
Nest : Bird : : Den : ?