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

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Can you identify the hidden rebus in the image below?

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

Can you name an animal whose killing cannot be performed without spilling your own blood?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

Find the Goldfish below the given Image.