Blockchain CBDE Practice Questions| TestInsights

Question 1

When using assert to check invariants and it evaluates to false:

Aall gas is consumed.

Ball remaining gas is returned.

Correct : A

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Aall gas is consumed.

Ball remaining gas is returned.

Question 2

When using require to check input parameters and it evaluates to false:

Aall gas is consumed

Ball remaining gas is returned.

Correct : B

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Aall gas is consumed

Ball remaining gas is returned.

Question 3

To send ether to a contract without a function call:

Aa fallback function must be declared and it must be made payable. If there is no fallback function or the fallback function is not payable it will throw an exception.

Beither a fallback function which is payable exists, or no fallback function at all exists.

Cyou cannot send ether to a contract without explicitly calling a function. The fallback function can never receive ether.

Correct : A

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Aa fallback function must be declared and it must be made payable. If there is no fallback function or the fallback function is not payable it will throw an exception.

Beither a fallback function which is payable exists, or no fallback function at all exists.

Cyou cannot send ether to a contract without explicitly calling a function. The fallback function can never receive ether.

Question 4

.Require is used:

Ato check internal states that should never happen.

Bto check input arguments from users.

Correct : B

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Ato check internal states that should never happen.

Bto check input arguments from users.

Question 5

To develop smart contracts:

Ait's good to start with a local in-memory blockchain with unit tests but then deploy to the mainnet as rapidly as possible.

Bit's good to start with a local in-memory blockchain with unit-tests. Then, in the next step, debug and test the smart contract on a test-net like Ropsten or Rinkeby with beta customers to iron out last issues before deploying it to the main-net.

Cit's good to start with a test-net with beta-customers like on the Rinkeby or Ropsten testnet, before testing it locally on an in-memory blockchain simulation such as Ganache. Then deploy it to the main-net.

Correct : B

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Ait's good to start with a local in-memory blockchain with unit tests but then deploy to the mainnet as rapidly as possible.

Curious about Actual Blockchain Certified Blockchain Developer - Ethereum (CBDE) Exam Questions?

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