Which is faster, Heat or Cold ? Explain.

Find the missing letter in the last circle logically in the given below picture.

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you solve below mathematical equation?

2^1234 - 2^1233

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Can you find the 09 errors in the picture below?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

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

What do you get if you add 2 to 100 four times?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?