CBDE BTA Certified Blockchain Developer-Ethereum Test Paper

Sample Questions: Q) Consensus is reached: A. by the miner nodes which make sure that a transaction is valid. B  by every single node in the blockchain network executing the same transaction. C. by a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible. Q) Solidity gets compiled: A. to bytecode that can’t be understood by humans. B. to bytecodes which are essentially opcodes running instruction by instruction. Q) Having a bug-bounty program early on: A. can help to engage the community in testing your smart contracts and therefore help to find bugs early. B. might be a burden as it is an administrative overhead mainly. C. is completely useless. Who wants to test beta-ware software? It’s better to start with the bug-bounty program after the contract is released on the main-net. Q) The nonce-field in a transaction is used: A. to protect against replay attacks. B. to have an additional checksum for transactions. C. to sum up all ethers sent from that address. Q) Which statement is true about the EVM?A. While the EVM is Sandboxed, it isn’t as powerful as the Bitcoin Network, because it’s not Turing Complete. B. The EVM can’t access hardware layers or anything outside a blockchain node because it’s sandboxed. C. The EVM is extremely powerful, truing complete and perfect for doing computational intensive things, because of the direct access to the graphics card.