Create Ethereum and Blockchain Applications 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