When monkey rotate the gear, which mark will be hit 1 or 2 ?

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

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

Do You See It?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Make a sentence consisting of three words that have the whole alphabet.

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag