What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

What is the word or phrase?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

What can you hold in your right hand, but never in your left hand?

What time is it when an elephant sits on a fence?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?