How many sides does a circle have?

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 ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

My location can be determined by the below rebus.
So where am i ?

Can you find a rabbit in the given picture?

One fine day, an intellectual man came to the emperor's court with the aim of testing Birbal's wittiness. In order to do this, he challenged Birbal to answer his question and hence prove that he was as intelligent and witty as he was said to be.
He asked Birbal, Do you want me to ask one difficult question or a hundred easy ones?
Since both Akbar and Birbal had had a tough day and were eager to leave, Birbal hastily told the intellectual to ask him a single difficult question.
Intellectual: OK. Tell me what came first into the world, the egg or the chicken?
Of course, the chicken, Birbal replied with a smile.
This time with a note of victory in his voice, the intellectual asked Birbal, How will you demonstrate that?
What did Birbal say?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?