Verbal Reasoning - Mental Ability Questions

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

a_ ca_c_dc_d_ad_

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, 6x4= 12, 4x12= 24, 12x6= 36 then 6x9= ?

If 'god id fair' = 'ge se fa', 'who is god' = 'ge we fa' and 'you are god' = 'ae le fa, which code does represent 'is'?

Select the missing number.

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

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

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

76, 38, 19, 9.5, ?