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

There is something which you can be arrested for attempting but not for successfully completing.

You can see it everyday, But cannot touch it at will. What is it?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

You need to move three matchsticks to form three squares. Can you do it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Which five letter word can be added at the end of below word to form a
valid word?

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There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?