Find the odd word from the following figure?

 Select the alternative that will replace the question mark in the analogy ACTION : TCANOI∷ CACTUS : ?

Complete the series choosing the missing number:

3, 15, 63, 255, 1023, ______

In a certain code language, "HAMMER" is written as "MAHERM". How is "MATTER" written in that code language?

In each of the following questions, five words are given. Which of them will come in the middle if all of them are arranged alphabetically as in a dictionary?

In the following question, select the related letters from the given alternatives.
TRACK : MECTV : : POND : ?

Read the following information carefully and answer the questions given below.
'3+2' means '3 is the father of 2'.
'3 – 2' means '3 is the sister of 2'.
'3 × 2' means '3 is the husband of 2'.
'3 ÷ 2' means '3 is the wife of 2'.

In a certain code language, "come at once mother very sick" is written as "XLNV ZG LMXV NLGSVI EVIB WJXP". What is the code for "sister"? 

In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.