Most Recent Blockchain CBDE Exam Questions & Answers

Prepare for the Blockchain BTA Certified Blockchain Developer - Ethereum exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

QA4Exam focus on the latest syllabus and exam objectives, our practice Q&A are designed to help you identify key topics and solidify your understanding. By focusing on the core curriculum, These Questions & Answers helps you cover all the essential topics, ensuring you're well-prepared for every section of the exam. Each question comes with a detailed explanation, offering valuable insights and helping you to learn from your mistakes. Whether you're looking to assess your progress or dive deeper into complex topics, our updated Q&A will provide the support you need to confidently approach the Blockchain CBDE exam and achieve success.

The questions for CBDE were last updated on Nov 17, 2024.

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Question No. 1

Assert is used:

Ato check internal states that should never happen.

Bto check input arguments from users.

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Correct Answer: A

Question No. 2

Finish the sentence: The Library Web3.js is ...:

Auseful when developing distributed applications with HTML and JavaScript, because it already implements the abstraction of the JSON-RPC interface of Ethereum Nodes.

Bnecessary when developing distributed applications with HTML and JavaScript, because the proprietary JSON-RPC interface of Ethereum Nodes is a closed source.

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Correct Answer: A

Question No. 3

If you need more fine-grained functionality than solidity offers out of the box:

Ayou can incorporate inline-assembly to get better controls.

Byou have to import pre-compiled assembly files which are then hard-copied into the bytecode of the compiled solidity file.

Cyou can use Viper, the experimental assembly like language specifically to offer more flexibility.

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Correct Answer: A

Question No. 4

You need to use ____________ to get the address that initiated the transaction.

ATx.origin

BMsg.sender

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Correct Answer: A

Question No. 5

Using selfdestruct(beneficiary) with the beneficiary being a contract without a payable fallback function:

Awill throw an exception, because the fallback function is non-payable and thus cannot receive ether.

Bit's impossible to secure a contract against receiving ether, because selfdestruct will always send ether to the address in the argument. This is a design decision of the Ethereum platform.

Cselfdestruct doesn't send anything to a contract, it just re-assigns the owner of the contract to a new person. Sending ether must be done outside of selfdestruct.

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Correct Answer: B

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