File Info
| Exam | BTA Certified Blockchain Developer - Ethereum |
| Number | CBDE |
| File Name | Blockchain.CBDE.BrainDumps.2019-10-29.61q.vcex |
| Size | 31 KB |
| Posted | Oct 29, 2019 |
| Download | Blockchain.CBDE.BrainDumps.2019-10-29.61q.vcex |
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Demo Questions
Question 1
Consensus is reached:
- by the miner nodes which make sure that a transaction is valid.
- by every single node in the blockchain network executing the same transaction.
- by a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible.
Correct answer: B
Question 2
Having a bug-bounty program early on:
- can help to engage the community in testing your smart contracts and therefore help to find bugs early.
- might be a burden as it is an administrative overhead mainly.
- is completely useless. Who wants to test beta-ware software? It’s better to start with the bug-bounty program after the contract is released on the main-net.
Correct answer: A
Question 3
Which is the right order for Denominations?
- Wei, Finney, Szabo, Ether, Tether.
- Finney, Szabo, Mether, Gwei.
- Gwei, Szabo, Finney, Ether.
Correct answer: C
Question 4
Which statement is true about the EVM?
- While the EVM is Sandboxed, it isn't as powerful as the Bitcoin Network, because it's not Turing Complete.
- The EVM can't access hardware layers or anything outside a blockchain node because it's sandboxed.
- The EVM is extremely powerful, turing complete and perfect for doing computational intensive things, because of the direct access to the graphics card.
Correct answer: C
Question 5
To get most out of the blockchain, it is best:
- to use it for the whole business logic. It’s always best to have everything in once place.
- to use it only for things which need the benefits of the blockchain.
Correct answer: B
Question 6
A Hashing Algorithm is deterministic. What does it mean?
- it always produces the same output given the same input.
- it uses equally distributed data to produce the output given a long input.
- it shouldn't be possible to re-generate the input given the output.
Correct answer: A
Question 7
What's the correct scientific notation?
- 1 Ether = 10^18 wei, 10^9 Gwei, 10^3 Finney
- 1 Ether = 10^19 wei, 10^13 Gwei, 10^3 Finney
- 1 Ether = 10^16 wei, 10^13 Gwei, 10^3 Finney
- 1 Ether = 10^18 wei, 10^6 Gwei, 10^6 Finney
Correct answer: A
Question 8
What are Private Keys used for?
- To Protect the Public Keys by being cryptographically significant.
- To Sign Transactions And To Derive an Address From.
- To Generate An Address which can sign transactions.
Correct answer: B
Question 9
Proof of Work (PoW) vs. Proof of Stake.
- PoW is computationally intensive which requires lots of energy. On the other hand, miners earn straightforward a reward for mining a block and incorporating transactions.
- PoW is better than PoS, because with PoS we increase the amount of energy spent on the network.
- PoS is mining with specialized new hardware that has to be purchased with a stack of Ether in the network. Hence the Name: Proof of Stake, which derives from Stack.
Correct answer: A
Question 10
Transactions containing the same data to create the same smart contract are:
- always having the same signature.
- having a different signature because of the nonce which changes upon every transaction.
Correct answer: B
