How many meaningful English words can be made with the letters $ARTSE$ using each letter only once in each word?

If the first three letters of the word $COMPREHENSION$ are reversed,then the last three letters are added and then the remaining letters are reversed and added,then which letter will be exactly in the middle?

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

How many pairs of letters are there in the word $CLANGOUR$ which have as many letters between them in the word as in the 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.
$R, T, A, N, U, E$
$1, 2, 3, 4, 5, 6$

If the letters of the word $HANDOVER$ are arranged alphabetically from left to right,how many letters will remain at the same position?