Be active and find the killer in the picture Riddle below.

Which of the below owl is odd one out?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What's the only room from which no one can enter or leave

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

What you cannot hold but it is yours?

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?