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Home Blockchain CBDE

Blockchain CBDE Exam Practice Questions (P. 1)

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Question #1
Consensus is reached:
  1. A
    by the miner nodes which make sure that a transaction is valid.
  2. B
    by every single node in the blockchain network executing the same transaction.
  3. C
    by a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible.

Correct Answer:
B

Question #2
Smart Contracts can be written in:
  1. A
    Java, C++, Solidity and JavaScript, because the Ethereum Blockchain is completely language agnostic and cross compilers exist for every major language.
  2. B
    Solidity, Viper, LLL and Serpent, because those are high level languages that are compiled down to bytecode.
  3. C
    Solidity and JavaScript, because those are the official first implementations for Distributed applications and the Blockchain supports those languages fully.

Correct Answer:
B

Question #3
Solidity gets compiled:
  1. A
    to bytecode that can't be understood by humans.
  2. B
    to bytecodes which are essentially opcodes running instruction by instruction.

Correct Answer:
B

Question #4
Having a bug-bounty program early on:
  1. A
    can help to engage the community in testing your smart contracts and therefore help to find bugs early.
  2. B
    might be a burden as it is an administrative overhead mainly.
  3. C
    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 #5
Which is the right order for Denominations?
  1. A
    Wei, Finney, Szabo, Ether, Tether.
  2. B
    Finney, Szabo, Mether, Gwei.
  3. C
    Gwei, Szabo, Finney, Ether.

Correct Answer:
C

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