What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

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?

What is the next number in this series?

4,12,84,3612....

You can hear me, but you can't touch or see me.

What am I?

500 women soldiers are arranged in an array of ten rows and fifty columns in accordance with their respective heights. Now, the tallest woman from each row is asked to move out in the front. From them, the shortest one is labelled as Alpha. They are then asked to resume their original position.

Now, the shortest woman in each column is asked to come out in front. The tallest among them is labelled as Beta.

Can you find out if Alpha will be taller or Beta?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

I am white when I am dirty, and black when I am clean. What am I?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?