If all the letters in the word $PRINCE$ are rearranged in alphabetical order,then how many letter$(s)$ will remain unchanged?

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$R, T, A, N, U, E$
$1, 2, 3, 4, 5, 6$

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$E, L, B, M, A, G$
$1, 2, 3, 4, 5, 6$

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 every alternate letter starting from $B$ is deleted from the given alphabet,which of the following will be the tenth letter from the right end?

How many such pairs of letters are there in the word $DOCUMENT$,each of which has as many letters between them in the word as in the English alphabet?

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$T, E, L, S, C, A$
$1, 2, 3, 4, 5, 6$