What is the centre of gravity?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Find The Odd One Out

1. FLOW
2. SNIP
3. TRAP
4. DRAW
5. BACK

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

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?

What can you see in the middle of March and April that you can never see in any other month?