Verbal Reasoning - Mental Ability Questions

In the following question, select the related word from the given alternatives.
Frog : Amphibian : : Lizard : ?

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

a_d_bd_ab_dd

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. 12, 60, 240, 720, ?

A boy leaves his school and travels 20 km towards the north. He takes a left turn and travels 30 km, then he turns towards the east direction and travels 50 km further. Finally, he turns to his right and travels 20 km more. Which direction is he now with respect to his school?

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

3, 4, 12, 48, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. PR, VX, BD, ?

If (2)#* 4 = 2 and (4)#* 4 = 16, then what is the value of A in (6)#* A = 18?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
24 x 6 - 8 + 2 = ?