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: Jul 29, 2025

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Question 1

Smart Contracts can be written in:

A : va, C++, Solidity and JavaScript, because the Ethereum Blockchain is completely language agnostic and cross compilers exist for every major language

B : lidity, Viper, LLL and Serpent, because those are high level languages that are compiled down to bytecode.

C : lidity and JavaScript, because those are the official first implementations for Distributed applications and the Blockchain supports those languages fully.

Answer: B

Question 2

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

Question 3

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 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

The Fallback function:

A : nnot receive Ether, not even by adding the payable modifier

B : n contain as much logic as you want, but it’s better to keep it short and not exceed the gas stipend of 2300 gas

C : n be used to avoid receiving ether

Answer: B

Page: 1 / 21

Total 102 Questions | Updated On: Jul 29, 2025

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