Why Aeroplane windows are round?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

Can you identify the hidden rebus in the image below?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

What Deficiency does the below rebus represent?

VIT_MIN