Blockchain and Cryptocurrencies Quiz

Question 1 of 10

1. Question

For John to send a confidential document to a receiver, he should

use a pair of public key and private key to encrypt the document to the receiver.
use the receiver's private key to encrypt the document and the receiver will use his private key to decrypt the message.
use the receiver's public key to encrypt the document and the receiver will use his private key to decrypt the document.
None of the above

Question 2 of 10

2. Question

Which of the following is FALSE about a hash value:

A small change in input will result in a big change in the hash value.
For the same document, if we use the same hash function, we should produce the same hash value.
To verify a hash value, we need to obtain the private key of the creator of the hash value.
Similar to digital signature, a hash value can guarantee the integrity of a document, but is fixed in length no matte how big a document is.

Question 3 of 10

3. Question

Blockchain is said to be immutable because

the hash values of the transactions are chain together.
the transactions are readable by all.
the transaction is authorised by the digital signature of the owner of the account.
All of the above

Question 4 of 10

4. Question

Which of the following may NOT be considered an advantage(s) in using blockchain in supply chain? Select the most appropriate answer.

Blockchain enables more transparency in end-to-end tracking in the supply chain.
Blockchain enables verification of the source in the supply chain to help fight counterfeits.
Blockchain enables consumers to buy cheaper products.
All of the above

Question 5 of 10

5. Question

The application of Blockchain technology has greatly influenced the trade finance industry. What is/are seen as benefit(s) of blockchain to the trade finance industry? Select the most appropriate answer.

Traceability and tracking of goods real-time
Transparency of transaction between stakeholders in the blockchain network
Auditable chronological transaction records
All of the above

Question 6 of 10

6. Question

Which of the following(s) is FALSE?

All blockchain platforms are designed for a specific purpose.
Not all available blockchain platforms are public blockchains.
The type of consensus algorithm used in a blockchain platform has direct impact on the efficiency of the platform.
All of the above

Question 7 of 10

7. Question

Which of the following statements is NOT correct about permissioned blockchain?

Anybody can join a permissioned blockchain.
You need to have special identification to get onto a permissioned blockchain.
Permissioned blockchain allows only trusted parties with the appropriate access rights to view transactions.
None of the above

Question 8 of 10

8. Question

Identify the INCORRECT statement below for Proof of Stake consensus.

Proof of Stake consensus requires participants to invest significant computing power to validate blocks.
The Proof of Stake consensus will forfeit the staked tokens of participants who do not act honestly.
For Proof of Stake consensus, users who own more tokens/coins have a high chance to make the decision.
None of the above

Question 9 of 10

9. Question

What is NOT a key element of the scalability trilemma?
Select all appropriate answer(s).

Scalability
Security
Decentralisation
Availability

Question 10 of 10

10. Question

What is ransomware?

Ransomware will decrypt a victim's files and demand a ransom for encryption of files.
Ransomware will encrypt a victim's files and demand a ransom for decryption of files.
Ransomware is a malware that spreads from host to host and replicates to destroy transactions on Bitcoin.
Ransomware is a malware that affects only private entities.