A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

How many letters are in the alphabet?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?