Can you find out which number multiplied by itself will give the output as 12345678987654321?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Forwards I am heavy, backward I am not. What am I?

What you cannot hold but it is yours?

What has many keys but can’t open a single lock?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

What does this rebus mean?

O
N
C
E
TIME

A blonde put eyeliner on her head. Why?

What do you get if you add 2 to 100 four times?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?