Verbal Reasoning - Mental Ability Questions

If ALPHA = 36, BETA = 26 then DELTA = ?

If the code for MOTHER is JRQKBU then what is the code for PRINCIPAL?

Determine the value of ? $$\begin{gathered} 1-121-131-14.........1-1n-? \\ \end{gathered}$$

Introducing a woman, a boy says, "She is the wife of my grandfather's son". How is the woman related to the boy?

A migrating bird flies 40 km North, then turns East and flies 50 km, then turns North and flies 110 km, and turns to its left and flies 50 km. Where is it now with reference to its starting position?

Neeraj is facing north, then he turns 45 degree right and goes 25 m, then turns in south-east direction to move 25 m and from there 25 m to east. In which direction/place is he from his original place?

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
49, 64, ?, 100, 121

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

P_P_RPQ_S_Q_ST