Verbal Reasoning - Mental Ability Questions

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
PON, LKJ, GFE, ?

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

Find out the odd word/letters/number/number pair from the given alternatives.

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

Queen, Aqua, Pique, Torque, Antique, ?

Select the related word/letters/numbers from the given alternatives. CURE : DISEASE :: HEAL : ?

If "+" denotes "divided by", "x" denotes "added to", "÷" denotes "subtracted from" and "–" denotes "multiplied by", then
54 + 162 – 18 x 12 ÷ 6 = ?

Select the related word/letters/number from the given alternatives. Coins : Mint :: Bricks : ?

In a certain code language, '-' represents '+', '+' represents 'x', 'x' represents '÷' and '÷' represents '-'. Find out the answer to the following question.

10 + 20 x 10 ÷ 20 - 8 = ?