I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

How many times do a clock's hands overlap in a day ?

What will you call your mother's brother's brother-in-law?

What's the only room from which no one can enter or leave

What is black when you buy it, red when you use it, and gray when you throw it away?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

When we see 2 but call 10?

I have no life, but I can die. What am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?