Smart Contracts and dApp Design for Business BBLC Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   Why is gas cost a critical deployment consideration for a business dApp on Ethereum?

   • AGas costs directly affect the operational expenses of every transaction executed by the dApp.
   • BGas costs are only incurred during the initial deployment and not during subsequent use.
   • CGas costs determine the number of smart contracts that can be deployed on the network.
   • DGas costs are fixed and do not vary with network congestion.
   Reveal Solution Discussion Select an answer first
2. 32expert · hard

   A charity organization wants to build a dApp that allows donors to see exactly how their donations are used. They want to provide real-time transparency without overwhelming donors with technical details. They also need to integrate with existing payment processors. What is the best approach?

   • AUse a centralized database to track donations and only publish a summary on the blockchain.
   • BStore all donation data on-chain and display raw transaction hashes to donors.
   • CRequire donors to use a blockchain wallet and interact directly with the smart contract to make donations.
   • DBuild a web dashboard that shows fund allocation in simple charts, using an off-chain indexer to read blockchain data, and integrate with payment processors via a backend service.
   Reveal Solution Discussion Select an answer first
4. 33application · medium

   A logistics company wants to automate the release of payment to a carrier only after a shipment is marked as delivered by both the driver and the warehouse manager. The company's existing ERP system already tracks shipment status. What is the most appropriate way to integrate a smart contract into this workflow?

   • AReplace the ERP with a fully decentralized application that manages all shipment tracking on-chain.
   • BHave the smart contract directly query the ERP database using an API call from within the contract code.
   • CStore delivery confirmations only off-chain and manually execute the payment when both parties agree.
   • DDeploy a smart contract that receives delivery confirmation events from the ERP via an oracle, then triggers payment when both confirmations are recorded.
   Reveal Solution Discussion Select an answer first
5. 34application · medium

   A gaming company is developing a dApp for in-game item trading. They want to allow users to trade items securely without a central authority. They also want to prevent unauthorized changes to the game's item catalog. Which design pattern should they use?

   • AOwnership pattern to track item ownership and transfer permissions.
   • BFactory pattern to create new item types dynamically.
   • CEmergency stop pattern to pause trading if a bug is found.
   • DState machine pattern to manage the item lifecycle.
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A charity organization wants to create a dApp that allows donors to see exactly how their donations are spent. The organization wants to build trust without overwhelming donors with technical details. Which UX feature is most effective?

   • AA PDF report that is generated annually with a summary of all donations.
   • BA chat bot that answers donor questions by querying the blockchain in real time.
   • CA raw data viewer that displays the full transaction history, including gas fees and smart contract addresses.
   • DA timeline view that shows each spending event in plain language, such as 'Your donation funded school supplies on March 3'.
   Reveal Solution Discussion Select an answer first