Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

The Little ant seems to be always confused. Do you know why?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What word begins and ends with an E, but has only one letter?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

Count the Triangle in the figure given below:

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?