Verbal Reasoning - Mental Ability Questions

In a certain code language, "NATURE" is written as "TANURE". How is "LISTEN" written in that code language?

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

_BA_BBA_AB_B

Select the related word/letters/number from the given alternatives.
66 : 36 : : 99 : ?

If 16α1 = 8, 14α6 = 42 and 12α5 = 30, then find the value of 2α6 = ?

X and Y are brothers. R is the father of Y. T is the sister of S who is maternal uncle of X. How is T related to R?

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

Threatened

Select the appropriate combination of mathematical operators to be sequentially placed between the numbers given on the left of the following equation so that LHS = RHS.

5035 = 20

In the following question, select the related number from the given alternatives.
3 : 27 : : 4 : ?