How many meaningful four-letter English words can be formed with the letters $T, P, S, I$ using each letter only once in each word?

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

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

Arrange the given words in the sequence in which they occur in the dictionary and then choose the correct sequence.
$1.$ Credential $2.$ Creed $3.$ Crease $4.$ Cremate $5.$ Credible

The number of letters skipped between adjacent letters in the series is odd. Which of the following series observes this rule?

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 first ten letters of the given alphabet are written in the reverse order,which of the following letters will be the seventh to the left of the twelfth letter from the right end?