Free Blockchain CBDE Exam Questions

Become Blockchain Certified with updated CBDE exam questions and correct answers

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Total 102 Questions | Updated On: Mar 05, 2026

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Question 1

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

A : l gas is consumed.

B : l remaining gas is returned

Answer: A

Question 2

It’s possible to access the blockchain via an Ethereum Node:

A : ly via JavaScript because there is the proprietary Web3.js library.

B : by any programming language, as long as it adheres to the JSON-RPC standard.

Answer: B

Question 3

To communicate with an Ethereum node via [removed]

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

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

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

Answer: A

Question 4

The JSON-RPC Protocol:

A : used to communicate between blockchain nodes

B : used to ensure safe communication between miners

C : a mean of dumping the blockchain data in a so-called consensus export

D : used to communicate between the blockchain node and externally running applications

Answer: D

Question 5

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

A : Public Key is for Signing Transactions, the Private Key must be given out to verify the signature.

B : Private Key signs transactions, the Public Key can verify the signature

C : 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: Mar 05, 2026

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