Why is a river so rich ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What is so fragile that saying its name breaks it?

I’m tall when I’m young, and I’m short when I’m old. What am I?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Which number should replace the question mark?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?