Blockchain Technology Quiz

Which of the following algorithm is used for Ethereum blockchain?

• A. SHA-256

• B. SHA-512

• C. Ethhash

• D. All of above

Miner produce the hash with the combination of

• A. Previous Block Hash + Nonce

• B. Current Block Hash+ Previous Block Hash

• C. Blockdata + Nonce

• D. Nonce

In POET, the winner propagates signed certificate across all the nodes in the network

• A. True

• B. False

An attacker that become the dominant node and receives most of the rewards on the network is known as

• A. Denial of Service Attack

• B. Fake Stake Attack

• C. Non repudiation

• D. 51% attack

The number of faulty processors can be tolerated if we have 3m+1 total processors in the network.

• A. m

• B. m-1

• C. m+1

• D. m+2

In Practical Byzantine Fault Tolerant system, if the number of nodes increases then system security

• A. Increases

• B. Decreases

• C. Is independent from the number of nodes

• D. Can't Say

Which of the following is the unit of Gas?

• A. Ether

• B. Bitcoin

• C. Wie

• D. All Can be used as Gas depending on the Type of Blockchain

Difficulty level in PoW depends on

• A. Number of Active users

• B. Size of Blockchain

• C. Both A and B

• D. None of Above

Which on of the following give the solution for "Random Leader Selection Problem"?

• A. PBFT

• B. POET

• C. POW

• D. POS

Which of the following field is used in genesis file in order to prevent replay attack?

• A. Difficulty

• B. Nonce

• C. Hash Value

• D. Chain Id