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  3. CBDE

Blockchain CBDE Exam (page: 3)
Blockchain BTA Certified Developer - Ethereum
Updated on: 25-Dec-2025

Viewing Page 3 of 22
CBDE PDF 102 Questions

What's the correct scientific notation?

  1. 1 Ether = 10^18 wei, 10^9 Gwei, 10^3 Finney
  2. 1 Ether = 10^19 wei, 10^13 Gwei, 10^3 Finney
  3. 1 Ether = 10^16 wei, 10^13 Gwei, 10^3 Finney
  4. 1 Ether = 10^18 wei, 10^6 Gwei, 10^6 Finney

Answer(s): A



What are Private Keys used for?

  1. To Protect the Public Keys by being cryptographically significant.
  2. To Sign Transactions And To Derive an Address From.
  3. To Generate An Address which can sign transactions.

Answer(s): B



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

  1. The Public Key is for Signing Transactions, the Private Key must be given out to verify the signature.
  2. The Private Key signs transactions, the Public Key can verify the signature.
  3. The Private Key is to generate a Public Key. The Public Key can sign transactions, the address is here to verify the transactions.

Answer(s): B



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

  1. 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.
  2. PoW is better than PoS, because with PoS we increase the amount of energy spent on the network.
  3. 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.

Answer(s): A



Externally Owned Accounts:

  1. 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.
  2. are bound to a private key which is necessary to sign transactions outgoing from that account.
  3. are logical opcodes running on the ethereum blockchain very similar to smart contracts.

Answer(s): B



Viewing Page 3 of 22



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