How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What does below pictogram mean?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

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

What is the coolest letter in the alphabet?

what does the below rebus means?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

Can you write down eight eights so that they add up to one thousand?