Null Set is also called Void Set.
Some books have even called it Empty Set.
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-- The null set is a set with no members. -- So it has no members that are absent from any other set.
No. The null set cannot have a proper subset. For any other set, the null set will be a proper subset. There will also be other proper subsets.
The null set. Every set is a subset of itself and so the null set is a subset of the null set.
A null set is a set with nothing in it. A set containing a null set is still containing a "null set". Therefore it is right to say that the null set is not the same as a set containing only the null set.
There is only one null set. It is 'the' null set. It is a set which does not contain any numbers.