Download BTA Certified Blockchain Developer -Ethereum.PracticeTest.CBDE.2019-11-09.1e.49q.vcex

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Exam BTA Certified Blockchain Developer - Ethereum
Number CBDE
File Name BTA Certified Blockchain Developer -Ethereum.PracticeTest.CBDE.2019-11-09.1e.49q.vcex
Size 26 Kb
Posted November 09, 2019
Downloads 1

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Demo Questions

Question 1
A Hashing Algorithm is deterministic. What does it mean? 

  • A: it always produces the same output given the same input.
  • B: it uses equally distributed data to produce the output given a long input.
  • C: it shouldn't be possible to re-generate the input given the output.

Question 2
What's the correct scientific notation?

  • A: 1 Ether = 10^18 wei, 10^9 Gwei, 10^3 Finney
  • B: 1 Ether = 10^19 wei, 10^13 Gwei, 10^3 Finney
  • C: 1 Ether = 10^16 wei, 10^13 Gwei, 10^3 Finney
  • D: 1 Ether = 10^18 wei, 10^6 Gwei, 10^6 Finney

Question 3
What are Private Keys used for?

  • A: To Protect the Public Keys by being cryptographically significant.
  • B: To Sign Transactions And To Derive an Address From.
  • C: To Generate An Address which can sign transactions.

Question 4
Public Keys vs. Private Keys. Which statement is true?

  • A: The Public Key is for Signing Transactions, the Private Key must be given out to verify the signature.
  • B: The Private Key signs transactions, the Public Key can verify the signature.
  • C: The Private Key is to generate a Public Key. The Public Key can sign transactions, the address is here to verify the transactions.

Question 5
Proof of Work (PoW) vs. Proof of Stake.

  • A: 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.
  • B: PoW is better than PoS, because with PoS we increase the amount of energy spent on the network.
  • C: 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.

Question 6
Externally Owned Accounts:

  • A: can be destroyed using the selfdestruct keyword. This way all remaining ether will be sent to the receiver address, regardless if they have a fallback function or not.
  • B: are bound to a private key which is necessary to sign transactions outgoing from that account.
  • C: are logical opcodes running on the ethereum blockchain very similar to smart contracts.

Question 7
Smart Contracts:

  • A: are always living on the same address, because the blockchain is deterministic. So, one account can always have one smart contract.
  • B: are having the same address as the EOA.
  • C: are sitting on their own address. The Address is created from the nonce and the EOA address and could be known in advance before deploying the smart contract.
  • D: the address of the smart contract is a random address which gets generated by the miner who mines the contract-creation transaction.

Question 8
Transactions containing the same data to create the same smart contract are:

  • A: always having the same signature. 
  • B: having a different signature because of the nonce which changes upon every transaction.

Question 9
Sending one Ether is actually internally translated:

  • A: to Wei, so it will send the equivalent of 10^18 Wei.
  • B: to Finney, so it will send the equivalent of 10^3 Finney.
  • C: to Szabo, so it will send the equivalent of 10^6 Szabo.

Question 10
Hashing Mining uses:

  • A: Keccack256 while internally to hash values it's easy to use the Dagger-Hashimoto to create a meaningful hash.
  • B: the Dagger-Hashimoto hashing while internally the EVM uses SHA256 which is an alias for Keccack256.
  • C: the Dagger-Hashimoto hashing while internally the EVM uses Keccack256 which is almost similar to SHA256, but has a different padding so produces different hashes.



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