Verbal Reasoning - Mental Ability Questions

In a certain code, 592 means 'grapes are sweet', 374 means 'I like oranges' and 267 means 'oranges are sour'. Which digit represents sour?

If HEAR is written as KJHA, then MILK can written as

In each of the following questions three statements are given and these statements are followed by two conclusions numbered (1) and (2). You have to take the given three statements to be true even if they seem to be at variance from commonly known facts. Read the conclusions and then decide which of the given conclusions logically follows from the two given statements, disregarding commonly known facts.
Statements:

All books are novels.
No novel is a magazine.
All magazines are newspaper.
Conclusions: 

I.No book is a magazine.
II. Some newspaper are novels.

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.

2, 5, 10, 17, ? , 37

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.

6, 18, 54, ? , 486, 1458

If in a certain code, UNGIMMICKY is written as MIGNUYKCIM, then how will COMPLEXITY be written as in the same code?

Select the missing letter from the given responses?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

SAY, TDD, UGI, VJN, ?