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

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

Which English verb becomes past tense just by rearranging the letters?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What number should come in place of the question mark below?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

How many times in a given day, minutes and hour clock comes in a straight line ?