If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

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

What has no start, end, or centre?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Solve the equation in the image by looking at the pattern closely.

Can you solve below mathematical equation?

2^1234 - 2^1233

What English word has three consecutive double letters?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

I am lying and I always lie. Tell me whether I am lying or telling the truth.