How many times can you subtract the number 5 from 25?

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 ?

A man dies of old age on his 25 birthday. How is this possible?

How can you take 2 from 5 and leave 4?

What has a ring but no finger?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

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

You need to move three matchsticks to form three squares. Can you do it?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

Can you divide the below-given shape into four equal and identical pieces?