Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

Which country gets ill every time?

what's the probability of getting a king or a queen from a pack of 52 cards?

Replace the question mark with the correct number below.

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

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

O T T F F S S ?