I took the quiz once. I found that several questions do not have valid answers as options:
Q: What is the essence of <Attack 51%>?
A:
- Information changing for more than half of all Bitcoin transactions and impact on the entire system
- Ownerwhip of the 51% of mined Bitcoin
- Dual spending of the same bitcoins
- Changing complexity on own discretion
First of all, the proper spelling is Ownership (not Ownerwhip).
Second of all, while an attacker with 51% of the total combined hashing power of the entire network can double spend only their own bitcoins, it is not necessary. Someone with that much hashpower could do several other things to damage people's faith in the bitcoin network and discourage the mining and use of bitcoin.
Therefore, none of the options are "the essence".
Q: How much computing power is required to cover complexity 1 in the Bitcoin network?
A:
- 6.67 Mh/s
- 1 Mh/s
- 64 kh/s
- 4 Gh/s
The answers are all speeds. I'm not sure what you mean when you say "complexity", but i assume you are talking about "difficulty"? If so, then all 4 of those speeds are capable of mining a block at a difficulty of 1. The faster the hashing speed, the faster that miner is likely to solve the block, so it is likely to take longer for 64 kh/s to successsfully solve the block than 4 Gh/s.
Q: When was the first market transaction made using Bitcoin?
A:
- March 2011
- December 2010
- July 2010
- April 2009
The most well known "first transaction" was the two pizzas purchased by laszlo on May 22, 2010. May 2010 is not an option listed? I assume you are asking when MtGox started operating as a bitcoin exchange? In that case July 2010 would be the answer, but I certainly wouldn't consider that to be the "first market transaction".
Q: What does the Bitcoin mining represents by itself?
A:
- All Bitcoins were created beforehand and are distributed between the users in strong proportion with their contribution to the network computing power
- Bitcoins are awarded as a reward for decoding of transacted units, and their replenishment
- Bitcoins are created by the mining companies
- Bitcoin Foundation issues the reward for the usage of user's computing power
None of these answers are correct. Bitcoins are not created beforehand. There are no transacted units that need to be "decoded". The Bitcoin Foundation is a private club that has no control over who successfully mines a block.
Mining companies are awarded bitcoins for successfully mined blocks. While you could possibly say that they therefore "create" bitcoins, it is also possible for solo miners to successfully mine bitcoins. Furthermore, I wouldn't say that mining "represents" creation by the mining companies. Mining "represents" the proof-of-work that is used to achieve a distributed consensus about the ordering of transactions and secure the blockchain against manipulation by an attacker. In exchange for this service, the protocol awards bitcoins to the miner that successfully mines a block. This award is the sum of the block subsidy and all the transaction fees of all transactions included in the block.
That's 4 out of 15 questions (27%) that had either incorrect, or misleading answers. I suggest you learn a bit more about bitcoin, and make more of an effort to put correct answers into your quiz to avoid confusing people who assume that one of the options must be correct for each question.
