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?

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

If it is possible to make only one meaningful English word with the third,the seventh,the eighth and the tenth letters of the word $PREDICAMENT$,which of the following will be the third letter of that word? If no such word can be made,give $X$ as the answer and if more than one such word can be made,give $Y$ as the answer.

From the word $BEHIND$,how many independent words can be made without changing the order of the letters and using each letter only once?

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 above alphabet is written in the reverse order,which letter will be the twelfth to the left of the sixteenth letter from your left?

If each vowel in the word $HABITUAL$ is changed to the next letter in the English alphabet and each consonant is changed to the previous letter in the English alphabet,which of the following will be fourth from the left?