Mining Techniques BDC Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   In the early days of Bitcoin, miners used CPUs. Why did GPU mining become popular afterward?

   • AGPUs consume less electricity than CPUs
   • BGPUs are cheaper to purchase than CPUs
   • CGPUs are the only hardware that can run the Bitcoin software
   • DGPUs can perform many parallel hashing computations, greatly increasing hash rate
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A blockchain network's average block time has decreased from 10 minutes to 8 minutes over the past adjustment period. What should the next difficulty adjustment do?

   • AKeep the difficulty the same because the change is within normal variance.
   • BIncrease the difficulty to slow down block production.
   • CDecrease the difficulty to speed up block production.
   • DReduce the block reward to discourage miners.
   Reveal Solution Discussion Select an answer first
4. 23foundation · easy

   What is a 51% attack in a PoW blockchain?

   • AAn attacker steals 51% of all coins in circulation
   • BAn attacker gains control of more than half of the network's total hash rate
   • CAn attacker compromises 51% of the nodes running the software
   • DAn attacker finds a vulnerability in 51% of the codebase
   Reveal Solution Discussion Select an answer first
5. 24expert · hard

   A blockchain developer is designing a PoS system. They want to minimize the risk of a 'nothing at stake' attack. Which mechanism is most effective?

   • ARequiring validators to run high-performance hardware.
   • BUsing a longer block time to reduce the chance of conflicts.
   • CSlashing conditions that penalize validators for signing conflicting blocks.
   • DIncreasing the block reward to encourage honest behavior.
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   In Bitcoin, what happens to the block reward approximately every four years?

   • AIt is halved, reducing the rate of new coin issuance
   • BIt is doubled to encourage more miners
   • CIt is adjusted based on the current market price
   • DIt is replaced entirely by transaction fees
   Reveal Solution Discussion Select an answer first