With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you start the fire using two pieces of wood?

I can be cracked, made, told, and played. What am I?

Can you tell a 3D object that has just two surfaces?

Can you replace the question mark with the correct number in the below table sequence?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

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

What is the difference between a jeweller and a jailer?