Ethereum Developer Test 1

Question 1

Among the Ethereum addresses, public keys, and private keys, which statement is TRUE?

Accepted Answer

An address is 20 bytes long, a public key is 64 bytes and the private key is 32 bytes

Answer

The address serves as the public key; both are 20 bytes long, whereas the private key is 32 bytes long.

Answer

A public key is 32 characters, a private key is 64 characters long, and an address is 20 characters long.

Question 2

In solidity, the outcome of dividing number -5 by integer 2 is

Accepted Answer

-2 due to the truncated decimal (rounded to zero)

Answer

-2.5 as a result of the automated casting or conversion into a float.

Answer

Since Solidity only understands unsigned integers, it is not possible.

Answer

-3 as it is always rounded.

Question 3

What does it mean when we say, "A Hashing Algorithm is deterministic"?

Accepted Answer

When given the same input, it always generates the same output.

Answer

Given a lengthy input, it produces the result using equally scattered data.

Answer

Given the output, it shouldn't be feasible to generate the input again.

Question 4

What functions do private keys represent?

Accepted Answer

To verify signatures on documents and determine an address from.

Answer

To create a transaction-capable address.

Answer

To serve as a cryptographically significant shield for the Public Keys.

Question 5

What does a transaction's nonce-field imply?

Accepted Answer

To defend off replay attacks

Answer

Adding a second checksum to transactions

Answer

All ethers sent from that address combined

Question 6

Complete the statement, "DApps are..".

Accepted Answer

Answer

For banks and other large financial institutions, a novel application of logical processes. In this way, they may operate with less people and higher security.

Answer

Good, that they eliminate the middleman, operate on a reliable platform, add logic to the blockchain where existing financial assets are already functioning, and so enable peer-to-peer trade.

Answer

A great method for developing new applications. These platforms' apps run totally independently of one another and support logical interactions. They are unable to access any money, which adds another element of trust.

Question 7

Choose the correct scientific notation?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 8

It is best to use the blockchain to its full potential...

Accepted Answer

To only utilize it for purposes that require the advantages of the blockchain.

Answer

To apply it to the entire business logic. Having everything in one location is always preferable.

Answer

Both statements are correct.

Question 9

Which statement is TRUE about Proof of Work (PoW) and Proof of Stake.

Accepted Answer

PoW has a high energy requirement due to its computational complexity. But at the other hand, mining a block and adding transactions results in a clear reward for the miner.

Answer

PoS mining uses specialized brand-new hardware that must be acquired with a network-wide stack of ether. Thus the name, which comes from Stack and is called Proof of Stake.

Answer

PoW is superior to PoS since the network uses more energy when PoS is used.

Question 10

How many stakeholders made up the DAO?

Accepted Answer

18000

Answer

10000

Answer

35000

Answer

48000