In a simple sentence, the word order you were given is sound and
neutral. Changing the word order simply changes the point of emphasis.
Something at either the beginning or the end of a sentence will be
more emphatic if it is there in defiance of the usual word order
given.
The other thing is that turning a sentence into a question can bring
the verb forward. On ee znaet. Razve on ee znaet? Znaet li on ee?
VDH