Blockchain Set 1

In which of the following algorithms mining is not involved in the consensus process?

Which of the following statements about Merkle trees in a blockchain are correct:

1. Every non-leaf node is labeled with the hash of the values (or labels) of its child nodes.
2. Every leaf node is labeled with the hash of a data block.
3. The root node only contains information of its child nodes.
4. The data stored in Merkle Trees can be tampered easily.

What are the two high-level categories of the current blockchain system?

Which of the following attacks is associated with blockchain?

Which of the following statements about blockchain are true:

1. It is an immutable digital ledger implemented in the distributed fashion.
2. It is only applicable to cryptocurrencies such as bitcoin.
3. The first block in a blockchain is referred to as the Start block.
4. Asymmetric cryptography is used for user security.

In Blockchain, which of the following statements about Hyperledger fabric is correct?

How are the blocks in a blockchain chained together?

Which of the following statements about a nonce in a blockchain are correct:

1. A nonce is a field in a block-header which serves as one of the inputs to calculate the current block's hash.
2. The value of nonce is under the user's control and can vary for a particular block.
3. A nonce has a fixed value for each block.
4. The value of a nonce is dependent on the value of the block number.

Which of the following statements describes an orphan block in blockchain?

In blockchain, what are the cryptographic hash functions within the blockchain network used for?

1. Creating unique identifiers
2. Securing the block header
3. Securing the block data
4. Deriving address of blocks