If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Can you start the fire using two pieces of wood?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

What kind of band never plays music?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

What can you hold in your right hand, but never in your left hand?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Which is the smallest number that you can write using all the vowels exactly once?