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

What you cannot hold but it is yours?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?