Computer Science Post Test Review

What should you do if you need help from your teacher to understand something after the test?

• Ignore it

• Come to clinic for help

• Ask a friend

• Skip the topic

Why might a machine learning model be biased towards identifying smiles from white students more successfully than from black or Asian students?

• The model was programmed to prefer white students

• The training data only contained photos of smiling white students

• The camera quality was better for white students

• The model cannot recognize smiles at all

Which of the following is a possible limitation of the facial expression recognition system developed by Wellness Inc.?

• It may not accurately identify all facial expressions.

• It can only be used outside the classroom.

• It guarantees privacy for all students.

• It does not require any cameras.

How should line 04 be changed to calculate cubic numbers instead of squares?

• i*i

• i*i*i

• i+i+i

Which word from the box describes information that is in its original, readable form before encryption?

• ciphertext

• key

• plaintext

• unreadable

What can you change to get a different ciphertext using the same encryption algorithm?

• Plaintext

• Key

• Cipher text

• Algorithm

Using the ASCII table, what is the denary code for the exclamation mark (!) in "CS Rocks!"?

• 33

• 67

• 82

• 99

What is a random substitution cipher?

• A cipher where each letter is replaced by a different, randomly chosen letter

• A cipher where each letter is replaced by a number

• A cipher where each word is replaced by a symbol

• A cipher where only vowels are replaced

If every letter in the plaintext always has the same replacement in the cipher, what does this mean for the decoding process?

• Once you know the replacement for one letter, it is the same throughout the message

• The replacement changes every time the letter appears

• The replacement is random each time

• The replacement is based on the word, not the letter

How can you use the information from the letter frequency graph to help solve a coded message?

• By guessing the most common letters in the code based on the biggest bars

• By ignoring the frequency of letters

• By only looking for vowels

• By using only the least common letters