Blockchain CBDE Quiz:1 Topic:3 Questions:1-5

Free Practice Mock Questions Set 1-5 (Quiz # 1) for Blockchain CBDE Exam, according to official Blockchain BTA Certified Blockchain Developer - Ethereum exam syllabus topic # 3

Question: 1

The Fallback function:

Acannot receive Ether, not even by adding the payable modifier.

Bcan contain as much logic as you want, but it's better to keep it short and not exceed the gas stipend of 2300 gas.

Ccan be used to avoid receiving ether.

Answer : B

Show Answer

Hide Answer

Question: 2

The JSON-RPC Protocol:

Ais used to communicate between blockchain nodes.

Bis used to ensure safe communication between miners.

Cis a mean of dumping the blockchain data in a so-called consensus export.

Dis used to communicate between the blockchain node and externally running applications.

Answer : D

Show Answer

Hide Answer

Question: 3

Loops in Solidity:

Aare a great way to circumvent gas requirements, because a loop will only consume gas once.

Bare dangerous when used with data structures that grow, such as arrays or mapping, because it is hard to estimate the gas requirements.

Cshould be avoided where possible, because of unknown side-effects on the gas requirements.

Answer : B

Show Answer

Hide Answer

Question: 4

Integrating the community into your testing:

Ais great, because they often find bugs which weren't considered before.

Bis not good, because you might give out secrets.

Answer : A

Show Answer

Hide Answer

Question: 5

Externally Owned Accounts (EoA):

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

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

Answer : A

Show Answer

Hide Answer

Quiz 1

Please Enter Your Email

You can try More Free Quizzes or Save Time by using our Premium Questions

Check Premium Offer (Limited Time Offer)
Try Free Quizzes