CBDE questions • Exam prepare

Exam contains 99 questions

Page 9 of 17

Question 49 🔥

Function and Variable Visibility:

Which database solution meets these requirements?

A. a function that is marked as internal cannot be called by other contracts, unless the function is used by a derived contract. Private Functions cannot be called by any other outside contract and public variables are generating automatically a getter function.

B. a function that is marked as external can never be called internally. Private functions can also be called by derived contracts using inheritance. Private variables are accessible also in derived contracts.

Discussion of the question

Question 50 🔥

View and Pure Functions:

Which database solution meets these requirements?

A. a function marked as pure can change the state, while a view function can only return static calls.

B. a function marked as view can never access state variables, while pure functions are here to return only one value.

C. a view function can access state variables, but not write to them. A Pure function cannot modify or read from state.

Discussion of the question

Question 51 🔥

View and Pure Functions:

Which database solution meets these requirements?

A. can only be accessed during calls.

B. can be accessed during transactions and calls.

Discussion of the question

Question 52 🔥

The Fallback function:

Which database solution meets these requirements?

A. cannot receive Ether, not even by adding the payable modifier.

B. can contain as much logic as you want, but it’s better to keep it short and not exceed the gas stipend of 2300 gas.

C. can be used to avoid receiving ether.

Discussion of the question

Question 53 🔥

You need to use ____________ to get the address that initiated the transaction.

Which database solution meets these requirements?

A. Tx.origin

B. Msg.sender

Discussion of the question

Question 54 🔥

If a User calls contract A and that calls Contract B, then msg.sender in Contract B will contain the address of:

Which database solution meets these requirements?

A. the User.

B. contract A.

Discussion of the question

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blockchain CBDE

Exam contains 99 questions

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