Blockchain Developer Test 5

Question 1

Which is not popular consensus algorithm in the list

Accepted Answer

Digital workforce

Answer

PBFT (Practical Byzantine Fault Tolerance)

Answer

Proof-of-work

Answer

Proof-of-stake

Question 2

Why is Blockchain a trusted approach?

Accepted Answer

All of the above

Answer

Blockchain can be trusted due to so many reasons.

Answer

Its compatibility with other business applications due to its open-source nature.

Answer

Its security. As it was meant for online transactions, the developers have paid special attention to keeping up the pace when it comes to its security.

Question 3

Is it possible to modify the data once it is written in a block?

Accepted Answer

No, it’s not possible to do so

Answer

Yes it is possible

Answer

It depends

Question 4

Is it possible in Blockchain to remove one or more block from the networks?

Accepted Answer

Yes, it can be done

Answer

No, it is not possible

Answer

Sometimes

Question 5

What are the common types of records that can be kept on the Blockchains?

Accepted Answer

All of these

Answer

Records of medical transactions

Answer

Identity management

Answer

Transaction processing

Question 6

_______ is a data structure that is used for verifying a block. It is in the form of a binary tree containing cryptographic hashes of each block

Accepted Answer

Merkel Tree

Answer

Blockchain

Answer

Ledger

Answer

Cryptography

Question 7

In this stage and individual evaluates all requirements and decides a suitable blockchain platform to be implemented.

Accepted Answer

Planning stage

Answer

Controlling and monitoring the project

Answer

Development and implementation of a project

Answer

None of the above

Question 8

What are the parts of EVM memory

Accepted Answer

Storage, Memory and Stack

Answer

Database and storage

Answer

Front-end and Blockchain

Answer

None of the above

Question 9

Name some leading open source platforms for developing Blockchain applications.

Accepted Answer

All of the above

Answer

Ethereum

Answer

Eris

Answer

Hyperledger

Question 10

The ________ is a random value which is used to vary the value of the hash in order to generate hash value less than the target

Accepted Answer

Nonce

Answer

Hash value

Answer

Transaction data

Answer

Hash output