What number when divided in half becomes zero?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Can you guess the name of the month by looking the below rebus ?

I am an odd number. Take away a letter and I become even. What number am I?

You can see it everyday, But cannot touch it at will. What is it?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Find the number of squares in the below-given picture.

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?