Computer Science MCQS

The correct answer is When a model learns training data too well and fails on new data. because it describes a model that has memorized specific noise rather than learning general underlying patterns.

• Step 1 (Training Performance): An overfitted model fits the training dataset perfectly, achieving near-zero error margins by adapting to minor fluctuations and random noise within that specific data batch.


• Step 2 (Generalization Failure): Because it is tailored too narrowly to the training set, it fails to generalize accurately when presented with novel, unseen validation testing data.


• Incorrect Options:
  
  
  
  • When a model fails to learn training data is incorrect because failing to learn the initial training dataset describes underfitting, not overfitting.
  
  
  • When the dataset is too small is incorrect because a small dataset can cause overfitting, but it is not the definition of the concept itself.
  
  
  • When the training takes too long is incorrect because lengthy training times relate to computational resource thresholds rather than structural generalization errors.
  
  

The correct answer is Data redundancy and performance. because RAID 5 stripes data and parity information across three or more drives to balance fault tolerance and speed.

• Step 1 (Redundancy through Parity): RAID 5 protects against data loss by calculating parity data and distributing it across all drives in the array, allowing the system to completely reconstruct data if a single drive fails.


• Step 2 (Performance Enhancement): Because data blocks are striped across multiple disks simultaneously, the system can read data from several drives at once, significantly boosting read performance.


• Incorrect Options:
  
  
  
  • Speeding up internet connections is incorrect because RAID 5 is a local physical storage configuration that does not affect external network bandwidth or internet speeds.
  
  
  • Cooling down server rooms is incorrect because storage array configurations relate to data management, whereas cooling relies on dedicated HVAC and fan infrastructure.
  
  
  • Scanning for malware is incorrect because malware detection is executed by specialized antivirus software applications, not by underlying hard drive storage architecture.