Answer:
What word when read from left to right is a ruler, but when read from right to left is a servant?
I make everyone blind. You can't see me but I will always come back for you. What am I?
What kind of coat can only be put on when wet?
I pass before the sun but make no shadow. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
When is it bad luck to see a black cat?