What always comes into a house through the keyhole?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

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

People put me on the table and cut me but do not eat me. What am I?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

Can you write down eight eights so that they add up to one thousand?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.