Which generation of computers used vacuum

Among A, B, C, D and E, seated in a straight line, facing North, who sits exactly in the middle of the line?

How many sons does S have?

I. U is mother of S’s son Q, who has two sisters F and E.

F is in which direction with respect to E?

A question is given, followed by two statements I and II. Select which of the statement(s) is/are sufficient to answer the question.

Six persons J, K, L, M, N and O are sitting around a circular table, are they all facing the centre?

What is the difference between the ages of Rekha and Beenu?

Is ‘MORE’ the word formed from these four letters?

I. The word starts with M. There is only one letter between E and O.

In a certain code, if ‘5 6’ means ‘that  ball’, what do ‘5’ and ‘6’ mean respectively in that code?

Point Q is towards which direction with respect to N?

I. Point N is to the west of point U, Which is to the south of point S