Free Practice Blockchain CBDE Exam Questions 2026

Stay ahead with 100% Free BTA Certified Blockchain Developer - Ethereum CBDE Dumps Practice Questions

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Total 102 Questions | Updated On: May 23, 2026

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Question 1

When using assert to check invariants and it evaluates to false:

A : all gas is consumed.

B : all remaining gas is returned

Answer: A

Question 2

Unit-Testing on a local chain is important, because it helps you:

A : to run tests quickly and especially for free, compared to continuous deployment on the MainNetwork. This way you save a lot of fees, time and costs

B : to run tests in an environment where logging is activated. On the Main-Net you have no access to transaction logs and this is ultimately the information you need to debug your contracts

C : to avoid regression bugs with contracts that are updated constantly on the main-net. Once you update a contract on the main-net, the address stays the same, but the code changes and this can have disastrous side-effects.

Answer: A

Question 3

When considering smart contracts and the blockchain it's good

A : to move all existing logic to the blockchain, so everything runs on the same system. This way it might be more complex, but easier to maintain

B : to move only those parts to the blockchain that really need the blockchain. This way smart contracts can be easier to read, easier to test and are not so complex

C : to move those parts to the blockchain that deal with Ether transfers. All other parts can remain in traditional database systems. This way only the value-transfer is on the blockchain.

Answer: B

Question 4

To communicate with an Ethereum node via [removed]

A : the library you use must make use of the JSON-RPC Interface of an Ethereum Node

B : must Implement the Ethereum Protocol to connect to other Ethereum Nodes.

C : must use Web3.js, which is closed source to communicate to other Ethereum Nodes.

Answer: A

Question 5

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

Answer: B

Page: 1 / 21

Total 102 Questions | Updated On: May 23, 2026

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