Which of the following is a windows utility program

Change the question mark with the option that follows the applied logic in the first pair. 

1125 : 18 :: 1356 : ??

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

Select the option that represents the letters that when placed from left to right in the blanks below will complete the given letter series.

Select the appropriate picture to come forward in the given series.

Which figure should replace the question mark (?) if the following series were to be continued?

Select the option that represents the correct order of the given words as they would appear in an English dictionary.

1. Refinery

What is opposite to 'V' when the given figure is folded to form a cube?