Note that question 0 needs not to be answered.

I'll consider it, since ES originated this game. However, since Section 1, Paragraph 1, Line 1, Sentence 1 of The Rules as stated by ES said, "May I propose a new round of twenty questions?" then I shall stick to the proposal and play 20 Questions rather than Animal, Vegetable or Mineral.

My memory of the game says that I may answer only Yes or No, with the variations "I don't know" and "I can't answer" being the only other permitted answers. Those last two would not raise the count of questions, I think.

Strictly speaking, my answer to "Question 0: Animal, vegetable, mineral or mixed up, hybrid, something else category." should be "Yes." :-)

02) A book? No.
01) Edible? No.

Physical (as opposed to an abstract concept)?

03) Physical? Yes.
02) A book? No.
01) Edible? No.

Does it have moving parts?

04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.

Mineral?

05) Mineral? Yes.
04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.

Question 0 is supposed to be the bonus thing at the beginning to start it all off.

6) Is it found underground usually?

06) Underground usually? No.
05) Mineral? Yes.
04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.
00) Shall we play Twenty questions? Yes.

Question 0 is supposed to be the bonus thing at the beginning to start it all off.

<runs and hides.>

<looses the hounds>
7) Is it part of the landscape?

07) Part of the landscape? No.
06) Underground usually? No.
05) Mineral? Yes.
04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.
00) Shall we play Twenty questions? Yes.

<D'oh!>

08) Is it useful?

-0) Are we allowed negative numbers, and if so can I bagsie -0 ?

but (unless you are working in 1's complement) the value of -0 is the same as 0, isn't it?

08) Is it useful? Yes.
07) Part of the landscape? No.
06) Underground usually? No.
05) Mineral? Yes.
04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.
00) Shall we play Twenty questions? Yes.
-0) Negative numbers allowed? Yes.
-0.0) Reserve -0 for geg? Yes.

It's not unlikely that negative questions will fail not to refrain from preventing lack of obfuscation. Or not.

Is it of metal (fully or predominantly)?

09) Metal? No.
08) Is it useful? Yes.
07) Part of the landscape? No.
06) Underground usually? No.
05) Mineral? Yes.
04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.
00) Shall we play Twenty questions? Yes.
-0) Negative numbers allowed? Yes.
-0.0) Reserve -0 for geg? Yes.

Is it spherical?

10) Spherical? No.
09) Metal? No.
08) Is it useful? Yes.
07) Part of the landscape? No.
06) Underground usually? No.
05) Mineral? Yes.
04) Moving parts? No.
03) Physical? Yes.
02) A book? No.
01) Edible? No.
00) Shall we play Twenty questions? Yes.
-0) Negative numbers allowed? Yes.
-0.0) Reserve -0 for geg? Yes.

Someone else suggested the zero question. I'm happy with it being left out as so many things are not animal, mineral or vegetable.

11) Is it viewed positively?