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  • Exam Name: BTA Certified Blockchain Developer - Ethereum
  • Last Update: 19-Apr-2024
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CBDE Questions and Answers

Question # 1

What's the correct scientific notation?


1 Ether = 10^18 wei, 10^9 Gwei, 10^3 Finney


1 Ether = 10^19 wei, 10^13 Gwei, 10^3 Finney


1 Ether = 10^16 wei, 10^13 Gwei, 10^3 Finney


1 Ether = 10^18 wei, 10^6 Gwei, 10^6 Finney

Question # 2

Externally Owned Accounts (EoA):


are changing their address every time a Transaction is sent because of the nonce.


are keeping their address, but on the blockchain a nonce is increased every time they send a transaction to avoid replay attacks.

Question # 3

With the truffle config file you can manage:


the amount of gas your contract deployment and transactions, against your contract, will need. This way you can essentially lower the gas costs over traditional web3.js dApps.


different Networks to deploy your contracts to. This way you can easily deploy to a local blockchain, the main-net or the Ropsten/Rinkeby Test-Net with only one parameter.


you can manage your secret API keys to the Ethereum Network. This way you can get access to several different Ethereum nodes at the same time without the need to switch your keyfiles.

Question # 4

What is the difference between ERC20 and ERC721 Tokens in simple terms?


The tokens of a certain ERC20 symbol are all the same, the tokens of an ERC721 symbol are all different. So, ERC20 tokens are fungible, while ERC721 tokens are non-fungible.


The tokens of a certain ERC20 symbol are all different, the tokens of an ERC721 symbol are all the same. So, ERC20 tokens are non-fungible while ERC721 tokens are fungible.

Question # 5

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?


750,000,000,000,000 Wei


750,000,000,000 Wei


750,000,000 Wei


A flat fee of 1 Ether

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