CBCP Certified Blockchain Professional (CBCP) MCQ 2

Question 1

Which consensus mechanism requires validators to lock up cryptocurrency as collateral to participate in block creation?

Accepted Answer

Proof of Stake

Answer

Proof of Stake requires validators to stake (lock) cryptocurrency as collateral, with the probability of creating the next block proportional to the amount staked.

Question 2

In Ethereum's EVM, what is the purpose of 'gas' in transaction processing?

Accepted Answer

It measures computational effort and prevents infinite loops

Answer

Gas measures the computational effort required to execute operations on the EVM, prevents infinite loops by limiting execution, and compensates miners/validators for processing.

Question 3

What distinguishes a 'hard fork' from a 'soft fork' in blockchain protocol upgrades?

Accepted Answer

Hard forks are backward-incompatible while soft forks maintain backward compatibility

Answer

A hard fork creates a permanent divergence by introducing rules that old nodes cannot validate, making it backward-incompatible, whereas a soft fork tightens rules that old nodes can still accept.

Question 4

Which data structure does Bitcoin use to efficiently prove that a specific transaction is included in a block?

Accepted Answer

Merkle Tree

Answer

Bitcoin uses a Merkle Tree to organize transactions in a block, allowing lightweight clients to verify transaction inclusion with a Merkle proof without downloading the full block.

Question 5

In a Hyperledger Fabric network, what role does the 'Orderer' node serve?

Accepted Answer

It establishes transaction order and creates blocks for distribution

Answer

The Orderer in Hyperledger Fabric collects endorsed transactions, establishes a consistent ordering, packages them into blocks, and distributes those blocks to peer nodes.

CBCP - Certified Blockchain Professional Practice Test

CBCP - Certified Blockchain Professional Practice Test

CBCP Certified Blockchain Professional (CBCP) MCQ 2