Accredited Blockchain Professional Certification Exam

Q.1 Which of the following is NOT a reason why tokens stored on a blockchain represent value to their owners ?*

The tokens keep the same value as that of Gold. Hence it is called 'Digital Gold'.

The tokens are used to identify something or someone in a unique way. In this case the token can have a different value depending upon what it is identifying.

The tokens give the owner voting rights for proposed changes to the blockchain (Governance).

The tokens represent a form of crypto-currency which can be used as an alternative to traditional (fiat) money.

Q.2 The root layer (layer 1) in Blockchain Architecture is called the Consensus Layer*

True

False

Q.3 What are miners NOT responsible for?*

To add a Block

To verify the input & output of the transaction

To confirm the transaction

To give the reward

Q.4 What is the purpose of a nonce?*

Prevents double spending

A type of hash function

A random number used as the solution to a cryptographic puzzle

A code used to communicate information to all the nodes in a blockchain network

Q.5 Which of the following is NOT a benefit of Blockchain?*

High Security

Low Energy Consumption

Immutability

Transparency

Q.6 What is Proof of Stake?*

A certificate required to use the Blockchain.

A password needed to confirm the transactions.

Algorithm to generate private keys.

A transaction and block verification protocol.

Q.7 What is Hashrate?*

Number of times a Cryptographic hash generated by miner's computer in a second

A miner's machine's frequency

Total computation power of the Blockchain network

A difficulty level encoded in Blockchain client

Q.8 Who validate the blocks in Delegated Proof of Stake (DPoS)?*

Participants

Witnesses, voted upon by Stakeholders.

Anyone who connects to the Blockchain

Miners

Q.9 What type of architecture defines a Blockchain?*

Centralised

Matrixed

Single central authority

Distributed peer to peer

Q.10 What information does the Header of a Block contain?*

Timestamp

All of these

Merkle Root hash of all transaction hashes

Hash of previous block

Q.11 Which of the following is NOT a threat to blockchains?*

Trojan

Worm

None of these

Identity Theft

Q.12 Which of the following Blockchain Platforms do not support a native currency?*

Bitcoin

Hyperledger

All of these

Ethereum

Q.13 All blockchains use either Proof of Work (PoW) or Proof of State (PoS) consensus algorithms*

True

False

Q.14 What is a 'hardware wallet' in the context of Blockchains and Cryprocurrency?*

A wallet in an Blockchain online exchange.

A private key stored on a physical device that can be disconnected or connected to the internet.

A private key stored on a medium always connected to internet.

A cryogenic chamber used to cool GPU processors.

Q.15 Which language is used to create smart contracts on Ethereum?*

Javascript

Python

Solidity

Q.16 What is a genesis Block?*

The largest block on a Blockchain.

The first block after each block halving

The block at which a hard fork occurs on a Blockchain.

The first block of a Blockchain.

Q.17 Which of the following is NOT a good use cases for a Non-Fungible Token (NFT)?*

Stable Coins

Real Estate proof of ownership

Digital Music

Digital Art

Q.18 Ripple (XRP) is a blockchain platform designed for global payment solutions between financial institutions.*

True

False

Q.19 What is the name of the hashing algorithm used in Bitcoin?*

SHA-512

Whirpool

MD5

SHA-256

Q.20 What is the main advantage of the Ethereum blockchain over the Bitcoin Blockchain?*

The Ethereum blockchain has greater value the Bitcoin blockchain

The Ethereum blockchain is more secure than the Bitcoin blockchain

Ethereum charges lower transaction fees than Bitcoin

The Ethereum blockchain is programmable and can store and execute logic.

Q.21 What are Smart Contracts?*

An easy to enforce contract

A contract which is more intelligent than traditional contract

A blockchain based user agreement required in order to use a Blockchain

A digital version of a legal contract that is stored on a blockchain

Q.22 What is NOT a part of the Blockchain ecosystem?*

Decentralized Autonomous Organizations (DAOs).

Decentralized Applications (DApps))

Decentralized Convergence Protocols (DCPs)

Decentralized cryptocurrency exchanges (DEXs)

Q.23 Which of the following to true about 'hashing' of data to create a block identification ? *

The hash can be reversed and the original date revealed

Some blockchains do not use hashing

The primary use of hashing in blockchain technology is for the generation of public and private keys.

Q.24 What is a miner in the context of a Blockchain?*

A person who trades cryptocurrency using an online exchange

A computer that validates and processes Blockchain transactions and builds the blocks in a blockchain.

An algorithm that makes blockchains secure by a process of hashing.

A smart contract that enables the exchange of one cryptocurrency for another without using centralized intermediaries.

Q.25 What is an Atomic Swap?*

The movement of tokens from one Blockchain to another

A method used to ensure the security of blockchains

A smart contract technology that enables the exchange of one cryptocurrency for another without using centralized intermediaries

The smallest unit that Ethereum can be split into

Q.26 What is the name given when a Blockchain splits into 2 different versions?*

A sidechain

A transition

A fork

A division

Q.27 What is the best definition of a Blockchain?*

A Banking Application

Communication Network

A Distributed Database or Ledger

An Internet Application

Q.28 C++, Python and Solidity are the only programing languages which can be used to build Blockchains or Smart Contracts on Blockchains.*

True

False

Q.29 A blockchain address collision happens when 2 different transactions are made at the same time to the same address.*

True

False

Q.30 Which of these is NOT a necessary component of a Blockchain Transaction?*

The name of the person or company making the transaction

An Identifier of the block address of the sender of the transaction

The time the transaction occurs

An Identifier of the block address of the receiver of the transaction

Q. 31 What is a UTXO?*

Unspent Transaction Output

Unspent Technology Operations

United Transaction Operations

United Technology Output

Q. 32 What is the first step when choosing the correct Blockchain solution?*

Deciding on the token or coin that will be used

Fully understanding the Use Case

Designing the User Interface

Defining the type of Blockchain to use ( Ethereum, Hyperledger, Corda R3 etc)

Q. 33 Cryptographic hashing transforms a length of text and/or numbers into a string of alpha-numeric characters that acts as a digital fingerprint for the original text/numbers.*

True

False

Q. 34 Orphan blocks are created only when a 51% attack occurs on the Blockchain?*

True

False

Q. 35 Which of the following is NOT a part of asymmetric encryption?*

Dates of Birth (DOB)

Public Keys

Private Keys

Seed Phrases (Pass Phrases)

Q. 36 Merkel Tree Hashes and Transactions are part of which layer of Blockchain architecture?*

Data Layer

Application Layer

Consensus Layer

Network Layer

Q. 37 A method of splitting and storing a single logical dataset into multiple datasets to enable faster transactions is called ___________. *

Halving

Sharpening

Distributing

Sharding

Q. 38 Which of the following is NOT a good use case for Blockchain technology?*

Identity and Nationality verification

Storing personal login names with passwords

Preventing copyright violations for music and art

Tracking of goods in a supply chain

Q. 39 A private key on a Public Blockchain can be recovered if all the miners agree to it*

True

False

Q. 40 Which is NOT an Ethereum Token Standard?*

ERC-523

ERC-721

ERC-223

ERC-20

Q. 41 How can blockchain technology help in the field of pension funds?*

All of the other answers are correct

Automate the pension fund settlement process using smart contracts.

Keep an immutable record of all payments into the pension fund.

Automate the full life-cycle of pension fund transactions

Q. 42 Decentralized Finance (DeFi) refers to which of the following? *

The ability to buy and sell cryptocurrency through an online exchange such as Binance.

Financial services using Bitcoin as the main form of payment

Online Banking services

Financial services using smart contracts on Blockchains that don’t need intermediaries like a bank or lawyers.

Q. 43 P2P stands for*

Private to Private

Public to Public

Public to Private

Peer to Peer

Q. 44 What is the best definition of a 'Token' when applied to Blockchain technology?*

A digital credit that is given in exchange for Proof of Work (PoW) being done.

A digital asset stored in a unique blockchain address that represents something of value.

Digital money that can be exchanged for dollars.

The smallest unit of Bitcoin that can be traded.

Q. 45 A multi-national corporate enterprise is asking for advice on which blockchain solution to consider for connecting data from its suppliers and customers into one distributed network for better sharing of data. What is the best suggestion from the following choices ?*

Bitcoin or Ethereum

Coinbase or Binance

Apple or Microsoft

Hyperledger Fabric, r3 Corda or Quorum

Q. 46 Which of the following are NOT used as categories of different blockchain architectures ?*

Private OR Public

Symmetric Cryptography OR Asymmetric Cryptography

Proof of Stake OR Proof of Work

Permissioned OR Permissionless

Q. 47 Which of the following is not a form of Asymmetric Cryptography ?*

DSA ( Digital Signature Algorithm )

RSA ( Rivest-Shamir-Adleman )

AES ( Advanced Encryption Standard )

ECC ( Elliptic Curve Crytography )

Q. 48 Regarding Validation Rules for transaction data on a blockchain, which of the following statements is TRUE ?*

Validation Rules can never be change once the Genesis Block of a blockchain has been created.

Validation Rules are the same for every blockchain.

Validation Rules are based upon the application goal / use-case for the specific blockchain they are used for.

Validation Rules are signed by each miner before they can start mining blocks.

Q. 49 What is the main purpose of mathematical algorithms and protocols used for building blockchains ?*

The algorithms are used to create a complete and actual history of transactions as quickly and inexpensively as possible.

The algorithms are used to create a complete and actual history of transactions, preserve data integrity and protect against ‘bad actors’.

The algorithms protect the distributed database of transactions from hackers.

The algorithms create asymmetric encryption to limit access only to digital key holders.

Q. 50 What Is a Non-Custodial Wallet when used in cryptocurrency? *

A storage device that allows the owner to control the private keys of their own cryptocurrencies

A Distributed Online Exchange for Cryptocurrencies ( such as Uniswap )

A storage device that contains a copy of one or more blockchains

A Centralised Online Exchange for Cryptocurrencies ( such as Coinbase )

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