What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

Can you find a five letter word that is left with only two letters if one is removed?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Who is that with a neck and no head, two arms and no hands? What is it?

What do you call a fish without an eye?

What is the last thing you take off before bed?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

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