The method of transfer of heat in liquid

Statements:

Some blankets are quilts.

Some quilts are bedsheets.

Conclusions:

I. All quilts are blankets.

Which one of the following does not belong to the series?

Abz, Bcy, Cdx, Dew, Efr

Which of the following groups of letters when sequentially placed from left to right will complete the given series? 

54 : 3 :: ? : 4 :: 500 : 5

If each letter of the word "PROGRAMMING" is replaced by its successor in the alphabetical series, then which alphabet is third from the left end?

The question that follows is based on he given 3-digit numbers.

275, 463, 567, 428, 394, 663, 129

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

1. Meconium

In a certain code language: 

- A & B means 'A is the son of B', 

- A + B means 'A is the brother of B', 

Which of the following numbers will replace the question mark (?) in the given series?

68, 77, 89, 105, ?, 153