Verbal Reasoning - Mental Ability Questions

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
6, 18, 54, ? , 486, 1458

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

L, N, Q, S, V, ?

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

FU, HS, JQ, ?

A man is facing towards the west. He turns 45 degrees clockwise and then another 180 degrees anticlockwise. Finally, he turns 90 degrees in the right. Which direction is he facing now?

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

ENG, GQI, ITK, KWM, ?

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

If 8 θ 12 δ 6 = 60 and 13 θ 15 δ 11 = 74, then 18 θ 21 δ 15 = ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
60 x 5 + 3 ÷ 24 - 6 = ?