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Exam Overview
Exam Code CBDE
Exam Name Blockchain BTA Certified Blockchain Developer - Ethereum
Vendor Blockchain
Total Questions 102
Last Updated 26-Oct, 2026
Free CBDE Questions Get Premium Access
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Free CBDE Practice Questions

Explore 7 free practice questions for the Blockchain CBDE exam and review the answers and explanations to support your preparation.

  1. Question 1

    Single answer

     A Hashing Algorithm is deterministic. What does it mean?

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

    Correct Answer: A

  2. Question 2

    Single answer

    To get most out of the blockchain, it is best:

    • Option A:
       to use it for the whole business logic. It’s always best to have everything in once place.
      Correct
    • Option B:
      to use it only for things which need the benefits of the blockchain. 
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: B

  3. Question 3

    Single answer

    Which statement is true about the EVM?

    • Option A:
      While the EVM is Sandboxed, it isn't as powerful as the Bitcoin Network, because it's not Turing Complete.
      Correct
    • Option B:
      The EVM can't access hardware layers or anything outside a blockchain node because it's sandboxed.
      Correct
    • Option C:
      The EVM is extremely powerful, turing complete and perfect for doing computational intensive things, because of the direct access to the graphics card. 
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: C

  4. Question 4

    Single answer

    The nonce-field in a transaction is used:

    • Option A:
      to protect against replay attacks.
      Correct
    • Option B:
      to have an additional checksum for transactions. 
      Correct
    • Option C:
      to sum up all ethers sent from that address.
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: A

  5. Question 5

    Single answer

    Which is the right order for Denominations?

    • Option A:
       Wei, Finney, Szabo, Ether, Tether.
      Correct
    • Option B:
      Finney, Szabo, Mether, Gwei. 
      Correct
    • Option C:
      Gwei, Szabo, Finney, Ether.
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: C

  6. Question 6

    Single answer

    Solidity gets compiled:

    • Option A:
      to bytecode that can't be understood by humans.
      Correct
    • Option B:
      to bytecodes which are essentially opcodes running instruction by instruction.
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: B

  7. Question 7

    Single answer

    Consensus is reached:

    • Option A:
      by the miner nodes which make sure that a transaction is valid.
      Correct
    • Option B:
      by every single node in the blockchain network executing the same transaction.
      Correct
    • Option C:
      by a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible. 
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: B