Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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

How many bananas can you eat if your stomach is empty?

How many times in a given day, minutes and hour clock comes in a straight line ?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

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

What jumps when it walks and sits when it stands?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?