What you cannot hold but it is yours?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Can you place six X (crosses) in below board without making three in a row in any way ?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

What number when divided in half becomes zero?

Which alphabet is a part of our body?

If a wheel has 54 spokes, how many spaces are there between the spokes?

One evening there was a murder in the home of a married couple, their son and daughter. One of these four people murdered one of the others. One of the members of the family witnessed the crime.

The other one helped the murderer.

These are the things we know for sure:

1. The witness and the one who helped the murderer were not of the same sex.

2. The oldest person and the witness were not of the same sex.

3. The youngest person and the victim were not of the same sex.

4. The one who helped the murderer was older than the victim.

5. The father was the oldest member of the family.

6. The murderer was not the youngest member of the family.

Who was the murderer?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Before Mount Everest was discovered, what was the highest mountain in the world?