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: Aug 18, 2026

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Question 1

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 2

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 3

When considering smart contracts and the blockchain it's good

A : 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 : 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 : 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

Multi-Line Comments in Solidity are:

A : rking with either // or ///

B : rking with /* comment */ or /** @.. natspec style */

C : t possible, all comments must be single-line

Answer: B

Question 5

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

A : l gas is consumed.

B : l remaining gas is returned

Answer: A

Page: 1 / 21

Total 102 Questions | Updated On: Aug 18, 2026

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