Which flower has two lips?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Can you place three balls such that the equation shown in the picture holds true?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

Can it be possible to build a house that has all its four walls facing towards the South?

If eleven plus two equals one, what does nine plus five equal?

I am white when I am dirty, and black when I am clean. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?