I have branches, but no fruit, trunk or leaves. What am I?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

I have Rs.50 and I spend it in the way as below.

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What is the largest number you can write with just 3 digits?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What is the last thing you take off before bed?

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

How can this be possible?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?