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: Dec 18, 2025

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Question 1

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 2

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

Question 3

When defining a new datatype:

A : best to use a contract with public storage variables, so it can be used like a class

B : 's best to use a struct, which is cheaper than deploying a new contract

C : 's not possible to generate new datatypes in Solidity

Answer: B

Question 4

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 5

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

Page: 1 / 21

Total 102 Questions | Updated On: Dec 18, 2025

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