Why Aeroplane windows are round?

What is the relationship between these matchstick pictures below?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

How can you take 2 from 5 and leave 4?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?