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

In the picture given below, can you find out which digit will take place of the question mark?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

I don't get anymore wetter, no matter how much rain falls on me.

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 ?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What is both possible and impossible at the same time?

You can see it everyday, But cannot touch it at will. What is it?