Can you get 100%(warning may cause brain damage)

The hardest quiz on facebook! (note:all these questions have actual awnsers it's just a fact if you'll get them)

1 I have eyes but cannot see,I have ears but cannot hear,I have a nose but cannot smell,I will always be the same,WHAT AM I?
2 Think fast,what's the square root of 57?
3 What's heavier,100lbs of bricks or 100lbs of feathers?
4 What's the exact height of the CN tower?
5 Did you think this quiz was hard?