Ethereum Developer Test 5

Question 1

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?

Accepted Answer

750,000,000,000,000 Wei

Answer

750,000 Wei

Answer

750,000,000,000 Wei

Answer

A fixed charge of 1 Ether

Question 2

Which is TRUE about the Fallback function?

Accepted Answer

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

Answer

It is a method for preventing ether receipt.

Answer

Cannot accept Ether, even after applying the payable modifier.

Question 3

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

Accepted Answer

Using a Merkle Patricia Trie

Answer

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

Answer

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

Question 4

Solidity is assembled into

Accepted Answer

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

Answer

Bytecode that is incomprehensible to humans

Answer

None of the above

Question 5

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

Accepted Answer

2000 ETH

Answer

1000 ETH

Answer

1500 ETH

Answer

500ETH

Question 6

Which statement is TRUE regarding view and Pure Functions:

Accepted Answer

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

Answer

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

Answer

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

Question 7

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

Accepted Answer

Doesn't require any gas

Answer

Requires gas cost each time we check the account.

Answer

Both statement are correct

Question 8

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

Accepted Answer

Contract A

Answer

The User

Answer

None of the above

Question 9

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?

Accepted Answer

750,000,000,000,000 Wei

Answer

750,000,000 Wei

Answer

750,000,000,000 Wei

Answer

A single charge of 1 Ether

Question 10

Smart Contracts are programmable in

Accepted Answer

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

Answer

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.

Answer

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