Create Ethereum & Blockchain Application using solidity

Assessment

Q1. Does Ethereum support scripting?

• True

• False

Q2. Bitcoin is based on ________ blockchain.

• Private

• Public

• Public Permissioned

• Permissioned

Q3. How many Ethereum networks are you familiar with?

• 2

• 3

• 4

• 5

Q4. What is the average block size in Ethereum?

• Around 2KB

• 1KB

• 4KB

• None of the above

Q5. What is the average block time in Ethereum?

• 8

• 14

• 21

• 28

Q6. Can you recover your Ethereum account after losing your private key?

• True

• False

Q7. A smart contract is________.

• Business rules implied by the contract embedded in Block Chain

• A cognitive contract

• A legal contract is written in constrained English

• None of the above

Q8. Name some Test Networks for ethereum.

• Ropstentest network

• Kovan test network

• Rinkeby test network

• All of the above

Q9. Can you modify the data in a block?

• • True

  • False

Q10. How many types of Blockchain are there?

• 2

• 3

• 4

• 5

Q11. What are key features of blockchain?

A) Decentralized Systems

B) Distributed ledger

C)Safer & Secure Ecosystem

D) Minting

E) Centralized Systems

• Only A,B,C and D

• Only B,C,D and E

• Only C,D,E and A

• Only E,A,Band D

Q12. Can you hide a transaction?

• Yes

• No

• May be

• Not really

Q13. A block in the blockchain can never have more than one parent block.

• True

• False

Q14. Blockchain can be stored as which of the following?

• A flat file

• A Database

• Both A and B

• None of the above

Q15. Is it possible in Blockchain to remove one or more blocks from the networks?

• True

• False

Q16. Block consists of how many components?

• 3

• 6

• 9

• 11

Q17. In symmetric-key cryptography, the key that locks and unlocks the box is____________.

• same

• shared

• private

• public

Q18. Each block of a Blockchain consists of which of the following?

• A hash pointer to the previous block

• Timestamp

• List of transactions

• All of the above

Q19. Cryptanalysis is used_____________.

• to find some insecurity in a cryptographic scheme

• to increase the speed

• to encrypt the data

• None of the above

Q20. The primary benefit of immutability is______________.

• Scalability

• Improved

• Security

• Tamper Proof

• Increased Efficiency

Q21. What is the benefit of the blockchain technology?

• Immutability

• Security

• Transparency & Resiliency

• All of the above

Q22. Is there a way that a block may be recognised in a Blockchain?

• True

• False

Q23. In what order are the blocks linked in the blockchain?

• Forward Order

• Backward Order

• Increment Order

• Decrement Order

Q24. What are the different types of Blockchain available for transactions?

• Public

• Private

• Consortium

• All of the above

Q25. An algorithm used in encryption is referred to as cipher.

• True

• False

Q26. Can you remove a complete block from a network?

• True

• False

Q27. Is there a single type of blockchain?

• True

• False

Q28. Is it possible to modify the data once it is written in a block?

• True

• False