Question 1

Which one of the following is true regarding Smart Contracts on the Ethereum blockchain?

Options :

A :

They provide added security over off-chain transaction code on other blockchain networks

B :

Because they are compiled into bytecode they cannot be used in an unintended manner

C : Any flaw discovered in their code can quickly be updated and redeployed

D : They are Turing complete and deterministic in nature

Answer: D

Question 2

Secure Hash Algorithm (SHA-256) output is always 256 bits or 32 bytes in length regardless of the length of the input (even if input is millions of bytes). Select best answer.

Options :

A : NSA is spying on us so what-s it matters.

B : Depends on input

C : False

D : True

Answer: D

Question 3

Which of these desired outcomes is best obtained through a Blockchain solution?

Options :

A : Pending financial transactions need to be stored until completed and then should be deleted

B : A website that shows current data from various stock markets

C : A mobile app that displays information about today-s weather

D : None of the above

Answer: B

Question 4

In common blockchain design, identity and transaction approval is possible through:

Options :

A : AES encryption

B : Public key cryptography

C : Secret key cryptography

D : None of the above

Answer: D

Question 5

Consider the following scenario. A startup is building a chat app for smart phones where the messages sent between users are anonymous and get destroyed within 24 hours of being sent.

Which architecture would best solve the product need?

Options :

A : Ethereum for token management and chat messages; Mobile apps use JSON-RPC to communicate directly with Smart Contracts

B : Private blockchain to persist chat messages; Custom built token system with private blockchain smart contract

C : Token management for shareholders in a public blockchain; Mobile apps and data management built on existing multitier systems without use of blockchain

D : Hybrid blockchain for token management with Proof of Stake; private blockchain to persist the chat messages

Answer: C

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