Here are the answers to your questions:
Question 1:
Determining jurisdiction in situations involving ecommerce the answer is very clear cut.
Answer: False
Question 2:
Jurisdiction is the power of a court to hear a case and the authority to render a decision or judgement.
Answer: True
Question 3:
ECommerce is usually across boundaries and borders.
Answer: True
Question 4:
The Zippo case violated the use of the trademark.
Answer: False (The Zippo case dealt primarily with jurisdiction and not trademark violation.)
Question 5:
Quill has to collect sales tax in North Dakota.
Answer: False (The Quill Corp. v. North Dakota case established that states could not require businesses without a physical presence in the state to collect sales tax.)
If you have any more questions or need further clarification, feel free to ask!