Quiz 4 - Introduction to Smart Contracts

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DeFi MOOC

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Question 1 - At any given block in the chain, Ethereum has one and only one 'canonical' state, and the Etheruem virtual machine (EVM) is what defines the rules for computing a new valid state from block to block. Does EVM understand smart contract programming languages? *

1 point

Yes it understands Solidity

Yes, it understands Vyper

No, it only understands low level bytecode

Question 2 - Which of the following is incorrect regarding visibility in Solidity? *

1 point

Private variables can only be read by functions inside the same smart contract.

Private variables are not stored on Ethereum, and therefore no-one outside the smart contract can read them.

Public variables can be read by any smart contract.

Question 3 - How do you hide smart contract calls in a transaction? *

1 point

Call functions with private modifiers only

Run a private blockchain node, and send the transaction to the private blockchain node only.

Call into the targeted smart contract from another smart contract (internal transaction)

None of the above

Question 4 - Which of the following statement is incorrect? *

1 point

Fungible tokens are interchangeable

Non-fungible tokens can be summed up

Each non-fungible token has a distinct ID

Bonus Questions

Question 1 - Does transaction gas price (money paid per unit of smart contract computation) determine when a transaction is processed? (Hint: Go-Ethereum (Geth), orders the transactions based on their gasPrice and address nonce by default. Miners can deploy their own Ethereum client with customized ordering rules.)

1 point

Miners order transactions by gas price by default, but miners can manipulate the order of transactions.

Transactions with higher gas prices are guaranteed for faster transaction processing.

Miners order transactions randomly, and cannot manipulate the transaction order

Clear selection

Question 2 - Which of the following is incorrect regarding gas cost? (gas cost = gas price * gas).

1 point

A transaction with low gas price may not propagate in the network layer, as Ethereum client rejects low gas price transactions

A transaction is reverted during its execution, if there is not enough gas in the transaction. You are still charged the gas fee for every instruction leading up to the out of gas exception.

A transaction must specify the gasLimit parameter, which specifies a maximum number of gas that the miners can charge for the execution of this transaction.

None of the above.

Clear selection

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