Number of letters skipped in between adjacent letters in the series increases by one. Which of the following series observes the rule given above?

How many pairs of letters are there in the word $HORIZON$ which have as many letters between them in the word as in the English alphabet?

Arrange the given words in alphabetical order and choose the one that comes first: Guarantee,Groan,Grotesque,Guard,Group.

If the first five words in the sentence,"Meeta's mother meets me many times" are rearranged in alphabetical order,which word will be the middle word?

Study the letter series given below and answer the question that follows:
$H, D, Y, S, M, W, N, B, Q, P, O, C, R, T, B, L, Z, V, E, G, U, F$
Which letter has the same neighbours as in the alphabetical order,although they have changed places?

$A$ 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.
$C, E, L, S, M, U$
$1, 2, 3, 4, 5, 6$