Can you identify if it's a murder or a suicide ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

Why did the Girl throw the butter out of the window?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Can you find out the remainder when 3^300 is divided by 5?

I can write cow in 13 letters.

Can You?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?