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Free CBDE Exam Questions - Blockchain CBDE Exam

Blockchain CBDE Exam

BTA Certified Blockchain Developer - Ethereum

Total Questions: 102

Last Updated : 16-12-2024

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Blockchain CBDE Exam - Prepare from Latest, Not Redundant Questions!

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Blockchain CBDE Exam Sample Questions:

Q1.

When a smart contract pays out money:

Ait's good to use a push over a pull method.

Bit's good to use a push and a pull method to ensure that participants can get their money no matter the contract state. In addition to and pushing it should contain a withdraw method.

Cit's good to use only pull and no push method.

Q2.

When considering smart contracts and the blockchain it's good:

Ato move all existing logic to the blockchain, so everything runs on the same system. This way it might be more complex, but easier to maintain.

Bto move only those parts to the blockchain that really need the blockchain. This way smart contracts can be easier to read, easier to test and are not so complex.

Cto move those parts to the blockchain that deal with Ether transfers. All other parts can remain in traditional database systems. This way only the value-transfer is on the blockchain.

Q3.

When you are programming a game like poker of battleships where you need to hide opponents values is:

Awith private state variables. This way nobody else other than the smart contract itself can see the information

Bwith external contracts holding those values. This way we can make sure that the information flow is following a clear logic and nobody else can access this information.

CYou can't hide anything on the blockchain, because the information is public, just the call is private which means only other smart contracts would be limited in accessing that information.

Q4.

When you do external calls to other smart contracts:

Ayou should follow the checks-effects-interactions pattern and avoid state changes after the call.

Byou should follow the effects-checks-interactions pattern and avoid state changes before the call.

Cyou should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

Q5.

Assert is used:

Ato check internal states that should never happen.

Bto check input arguments from users.

Solutions:

Question: 1 Answer: B

Question: 2 Answer: B

Question: 3 Answer: C

Question: 4 Answer: A

Question: 5 Answer: A

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