Verbal Reasoning - Mental Ability Questions

If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication", then 315&3#9@4%6 = ?

In the following question, select the related letters from the given alternatives.
PRAG : QTDK : : STOP : ?

Choose the related word/letters/number from the given alternatives.
Nest : Bird : : Den : ?

If 'HARBOUR' is written as 'IBSCPVS' , how is 'HABITAT' written in that code?

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

_r_r_t_r_r_t

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

RTM, QRJ, PPG, OND, ?

Pointing towards a lady in a photograph, Sushma says, "She is the mother of my grandfather's son". How is Sushma related to the lady in the picture?

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

13,25,49,85, ?