Ethereum Developer Test 5 - Practice Test Geeks

If you engage with a smart contract and observe a 50,000 gas usage at a 15 Gwei gas cost, how much Ether would you be required to pay the miner?

750,000 Wei

750,000,000,000 Wei

750,000,000,000,000 Wei

A fixed charge of 1 Ether

Correct! Wrong!

Which is TRUE about the Fallback function?

It is a method for preventing ether receipt.

Cannot accept Ether, even after applying the payable modifier.

Can be as logical as you like, but it's best to keep it brief and not go over the 2300 gas allotment.

Correct! Wrong!

Which is TRUE about Storing almost all data in the Ethereum Blockchain?

Using a Merkle Patricia Trie

Because the Merkle Patricia Trie is too ineffective, a Radix Trie is used.

A linked list with references to earlier block hashes is utilized.

Correct! Wrong!

Solidity is assembled into

Bytecodes, which function similarly to opcodes but are executed instruction by instruction.

Bytecode that is incomprehensible to humans

None of the above

Correct! Wrong!

How much ETH was generated from 1 BTC at the start of the Ethereum token sale?

2000 ETH

1000 ETH

1500 ETH

500ETH

Correct! Wrong!

Which statement is TRUE regarding view and Pure Functions:

A view function can only return static calls while a pure function can change the state

State variables can only be accessed from by view functions. A pure function is unable to change or access state.

Pure functions are designed to return a single value, whereas functions defined as views are never allowed to access state variables.

Correct! Wrong!

Checking an address's balance repeatedly inside a smart contract's loop

Requires gas cost each time we check the account.

Doesn't require any gas

Both statement are correct

Correct! Wrong!

What address will be in msg.sender in Contract B if a User calls Contract A and that calls Contract B?

Contract A

The User

None of the above

Correct! Wrong!

How much Ether would you have to pay the miner if you interacted with a smart contract and saw a gas usage of 50,000 gas at a cost of 15 Gwei?

750,000,000 Wei

750,000,000,000 Wei

750,000,000,000,000 Wei

A single charge of 1 Ether

Correct! Wrong!

Smart Contracts are programmable in

Solidity, Viper, LLL, and Serpent since they are bytecode-compiled high-level languages.

Solidity and JavaScript, as they are the first distributed application implementations that have been officially released, and the Blockchain fully supports both of these programming languages.

Java, C++, Solidity, and JavaScript, as cross compilers for every major language are available and the Ethereum Blockchain is totally language agnostic.

Correct! Wrong!

Complete the statement : "Gas costs accrue on..."

Sending a transaction that solely interacts with a smart contract that has already been deployed

Only deploying a new smart contract when sending a transaction.

Sending a transaction regardless of its content.

Correct! Wrong!