Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Who always enjoys poor health?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

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

O T T F F S S ?

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you find the key in the picture below?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

I am lying and I always lie. Tell me whether I am lying or telling the truth.