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

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

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

What is next number in the pattern below:

131 517 192 123 ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Replace the question mark in the picture below.

Which five letter word can be added at the end of below word to form a
valid word?

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There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

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