What is the Surname of Barbie Doll?

What Deficiency does the below rebus represent?

VIT_MIN

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

Can it be possible to build a house that has all its four walls facing towards the South?

What came first, the chicken or the egg?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

John was drowned by he was not wet. How?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

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.'

I have a head like a cat and feet like a cat, but I am not a cat. What am I?