This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

What can you catch but never throw?

Can you name an animal whose killing cannot be performed without spilling your own blood?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den