Verbal Reasoning - Mental Ability Questions

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

If 6#30=5; 8#24=3; 7#28=4; then what is the value of 8#40=?

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

A man walks 7 km towards south and turns to the left. After walking 5 km, he turns to the right and walks 7 km. In which direction is he now from the starting point?

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

_r_r_t_r_r_t

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?

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

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

75 - 5 + 25 ÷ 125 = ?