Eight of us go fourth, not back, to protect our king from an attack. What are we?

John was piloting a plane behind a car but was never able to overtake it. Why?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

What's a single-digit number with no value?

I am white when I am dirty, and black when I am clean. What am I?

How many letters are in the alphabet?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

Which English verb becomes past tense just by rearranging the letters?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?