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CBDE Exam Questions & Answers
BTA Certified Blockchain Developer - Ethereum • Blockchain
102 Questions
90 min
Updated Sep 2026
99% Pass Rate
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Sample CBDE Questions
Practice with real exam-style questions, each with the verified correct answer and explanation.
Q1
MultipleChoice
It's not possible to use inheritance from multiple sources in Solidity.
Correct Answer: B
Q2
MultipleChoice
The nonce-field in a transaction is used:
Correct Answer: A
Q3
MultipleChoice
You interact with a smart contract and see a gas usage of 50,000 gas with a gas cost of 15Gwei.
How much Ether would you have to pay to the miner?
Correct Answer: A
Q4
MultipleChoice
Finish the sentence: The Library Web3.js is ...:
Correct Answer: A
Q5
MultipleChoice
Consensus is reached:
Correct Answer: B
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Unlock All CBDE QuestionsFrequently Asked Questions
There are no formal prerequisites, but candidates should have a solid understanding of blockchain technology, Ethereum fundamentals, and smart contract development. Prior experience with Solidity programming and familiarity with Ethereum architecture is highly recommended before attempting the certification.
The CBDE exam typically consists of multiple-choice and practical questions that must be completed within a set timeframe, usually around 2-3 hours. You generally need to achieve a score of 70% or higher to pass the certification.
The exam covers Ethereum fundamentals, smart contract development with Solidity, blockchain security, consensus mechanisms, gas optimization, and decentralized application (dApp) architecture. It also includes questions on Ethereum tools, development frameworks like Hardhat and Truffle, and best practices for blockchain development.
The exam cost varies by provider and region, typically ranging from $100-$300. The exam can usually be taken online through proctored testing platforms or at designated testing centers, depending on the certifying organization's policies.
Most blockchain certifications are valid for 2-3 years from the date of passing. Renewal typically requires retaking the exam or completing continuing education requirements to ensure your knowledge stays current with Ethereum updates and advancements.