Verbal Reasoning - Mental Ability Questions

Find the odd word/letters/number pair from the given alternatives.

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

YXWv, TSrQ, OnML, jIHG, EDCb, ?

Select the related word/letters/number from the given alternatives.
Nephrology : Kidney : : Ichthyology : ?

If 9@7=4; 6@1=10; 7@4=6; then what is the value of 8@2=?

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

Which of the following correctly represents the relationship between the following classes? A) Bell B) Water C) Brass

If 84+96=4842, then 36+78= ?

If A = 1, E = 5, then HEAR = ?