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?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

People make me, save me, change me, raise me. What am I?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

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

What demands an answer, but asks no questions

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.