Bitcoin Mining, Forking, and Scalability Solutions BDC Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which type of mining hardware is most commonly used for Bitcoin mining today?

   • AFPGA (Field-Programmable Gate Array) miners
   • BGPU (Graphics Processing Unit) mining rigs
   • CASIC (Application-Specific Integrated Circuit) miners
   • DCPU (Central Processing Unit) mining
   Reveal Solution Discussion Select an answer first
2. 12expert · hard

   A mining pool controls 55% of the network's total hash rate. The pool operator is considering a policy that would exclude blocks from a specific competitor's mining pool. What is the most significant risk of this action?

   • AIt would cause a hard fork because the competitor's blocks are invalid.
   • BIt would increase the difficulty for the pool, making mining less profitable.
   • CIt could enable a double-spend attack by allowing the pool to reverse transactions.
   • DIt would immediately reduce the block reward for all miners.
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A group of miners and developers want to increase Bitcoin's block size limit from 1 MB to 8 MB. They plan to release new node software that rejects blocks larger than 1 MB. What type of fork is this, and what is the primary consequence?

   • AHard fork; old nodes will automatically upgrade to the new software to stay on the same chain.
   • BSoft fork; old nodes will still accept the new blocks because they are backward compatible.
   • CHard fork; nodes running the old software will reject the new 8 MB blocks, splitting the blockchain.
   • DSoft fork; the new software is backward compatible because it still accepts 1 MB blocks.
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   What is a hard fork in the context of blockchain?

   • AA permanent divergence in the blockchain that occurs when nodes that do not upgrade reject blocks created by upgraded nodes
   • BA change that is backward-compatible and does not split the chain
   • CA change to the difficulty adjustment algorithm only
   • DA temporary split that resolves itself automatically
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A Bitcoin node operator notices that blocks are being found faster than the target 10-minute average. According to the difficulty adjustment algorithm, what should happen next?

   • AThe network will decrease the difficulty target, making it easier to find a valid block.
   • BThe network will wait until the next halving to adjust difficulty.
   • CThe network will increase the difficulty target, making it harder to find a valid block.
   • DThe block reward will be reduced to slow down mining.
   Reveal Solution Discussion Select an answer first