Why Aeroplane windows are round?

What is black when you buy it, red when you use it, and gray when you throw it away?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

Decode below rebus
D
N
A
T
S , D

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.