How many meaningful English words can be formed by using any two letters of the word $GOT$?

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

If it is possible to make a meaningful word with the second,the sixth,the ninth and the twelfth letters of the word $CONTRIBUTION$,which of the following will be the last letter of that word? If more than one such words can be made,give $M$ as the answer and if no such word is there,give $X$ as the answer.

Number of letters skipped in between adjacent letters in the series decreases by one. Which of the following series is observing the rule?

What will come in place of the question mark $(?)$ in the following letter-group series based on the English alphabet?
$WC, RE, NI, KO, ?$

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