It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

What is black when you buy it, red when you use it, and gray when you throw it away?

What kind of band never plays music?

When it's bad luck to meet a black cat?

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

If 1+9+8=1, what is 2+8+9?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?