What four weights can be used to balance from 1 to 30 pounds?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

How many letters are in the alphabet?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".

What is so fragile that saying its name breaks it?

what does this picture(rebus) riddle means ?

Count the number of triangles in the picture below:

Can you move 2 matchsticks to form four equal sized squares.