If the letters of the word $OBSERVANT$ are interchanged,such that the first becomes ninth,second becomes eighth,and so on,and the position of the fifth letter remains unchanged,then what will be the new arrangement of letters?

Arrange the given words in alphabetical order and choose the one that comes in the second place.

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
If the letters of the given alphabet interchange positions,so that $A$ takes the place of $Z$ and $Z$ takes the place of $A$; $B$ takes the place of $Y$ and $Y$ takes the place of $B$ and so on,what will be the thirteenth letter from the right?

Find which one word cannot be made from the letters of the given word.
$MIRACULOUS$

Arrange the given words in alphabetical order and choose the one that comes in the middle.

Arrange the given words in alphabetical order and choose the one that comes first.
Dictum,Diastole,Dictionary,Didactic,Dictate