Find the missing value denoted by ‘?’

4 : 16 : : 49 : ?

In a code language, CRICKET in written as NSENTIK. How will TENNIS be written as in that language?

Select the set in which the numbers are related in the same way as are the numbers of the following set.
(7, 89, 31)

Three of the following four numbers are alike in a certain way and one is different. Pick the number that is different from the rest.

In a code language, BLUE in written as 4244210 and BODY is written as 430850. How will CALM be written as in that language?

Select the related word from the given alternatives:

Medicine : Patient : : Education : ?

Identify the diagram that best represents the relationship among the given classes.
Music Instrument, Piano, Guitar

In the following question, by using which mathematical operator will the expression become correct?
18 ?6 ? 9 ? 27