Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What can jump higher than a building?

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

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

What does does this rebus picture means ?

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

What's the only room from which no one can enter or leave

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Can you find out who is the kidnapper in below Picture and why, Explain ?