What significant defence equipment is set to be retired

Select the letter cluster that will come next in the following series.

CHD, EJF, ______

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

Select the letter that will replace the question mark (?) in the given letter series.

a, d, h, n, ?

Four of the following five are similar in a certain way, which creates a group. 

Which of these is not related to this group? 

Select the option figure which is embedded in the given figure as its part (rotation is NOT allowed).

Select the number from among the given options that can replace the question mark (?) in the following series.

3, 20, 121, 604, 2417, ? 

In a certain code language, ‘STORY’ is coded as ‘97’ and ‘PULL’ is coded as ‘61’. How will ‘INCOME’ be coded in that language?

In the following question, select the missing number from the given series.

27, 46, 65, ?, 103

Select the option that is related to the third term on the same basis as the second term is related to the first term.

Zeal : Enthusiasm :: Abduct : ?