Solidity Concepts for Contract Development BDC Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which Solidity array property is true for a fixed-size array declared as uint[5]?

   • AIt can be used as a mapping key.
   • BIt has a fixed length of 5 elements.
   • CIt is stored in memory by default.
   • DIt can be resized dynamically.
   Reveal Solution Discussion Select an answer first
2. 12application · easy

   A developer is creating a contract to manage orders. Each order has a status that can be Pending, Shipped, or Delivered. The developer wants to ensure that only valid status values are used and to make the code readable. Which Solidity feature should they use?

   • Abool isDelivered;
   • Benum OrderStatus { Pending, Shipped, Delivered }
   • Cstring status; with string comparisons
   • Duint8 status; with constants for each status
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A developer is designing a set of contracts for a token system. They want to define a common interface that all token contracts must implement, but they also want to provide a default implementation for the transfer function that can be overridden. Which Solidity construct should they use?

   • AA library with an internal transfer function
   • BAn abstract contract with a virtual transfer function and a concrete implementation
   • CAn interface with a transfer function declaration and a separate library
   • DA base contract with a non-virtual transfer function
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   Which Solidity function is used to validate conditions and revert the transaction if the condition is false, consuming all remaining gas?

   • Athrow
   • Brequire
   • Cassert
   • Drevert
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   In Solidity, which data location is used for function parameters that are passed by external callers and is read-only?

   • Amemory
   • Bstorage
   • Ccalldata
   • Dstack
   Reveal Solution Discussion Select an answer first