Do Normal Forces Always Exist When Surfaces are in Contact?

[ritwik06]

Homework Statement

Is it necessary to have a normal reaction whenever 2 surfaces are in contact with each other?

The Attempt at a Solution

I thought the answer was "no". But my book says "yes".
I can support my answer with an example:
the normal force between the surface of a block and the floor of a freely falling lift under gravity is zero.

Please help me. Does my book author takes the molecular level forces into account when he goes on to say "yes"?

 

[Doc Al]

What book are you using? Does the book give an explanation or just make a statement?

I would say that in the usual sense of the term you can have a zero normal force between surfaces in contact.

 

[ritwik06]

What book are you using? Does the book give an explanation or just make a statement?

I would say that in the usual sense of the term you can have a zero normal force between surfaces in contact.

Its called "The Pinnacle FIITJEE package for Newton's Laws". I was just going through it when I found this.
It has just made an emphatic "YES" with no explanations whatsoever.

Thanks a lot. I think it might just be a misprint or something.