Comp Sci unit 3 #6

Central High School keeps a database of information about each student, including the numeric variables numberOfAbsences and gradePointAverage. The expression below is used to determine whether a student is eligible to receive an academic award.

(numberOfAbsences ≤ 5) AND (gradePointAverage > 3.5)

Which of the following pairs of values indicates that a student is eligible to receive an academic award?

• numberOfAbsences = 3, gradePointAverage = 3.5

• numberOfAbsences = 5, gradePointAverage = 3.8

• numberOfAbsences = 6, gradePointAverage = 3.4

• numberOfAbsences = 6, gradePointAverage = 3.6

Which of the following would be the best use of citizen science?

• An experiment that requires all participants to be working in the same laboratory

• An experiment that requires expensive equipment to conduct

• An experiment that requires data measurements to be taken in many different locations

• An experiment that requires specialized knowledge and training to conduct

A mobile application is used to display local traffic conditions. Which of the following features of the application best exemplifies the use of crowdsourcing?

• Users can save an address to be used at a later time.

• Users can turn on alerts to be notified about traffic accidents.

• Users can submit updates on local traffic conditions in real time.

• Users can use the application to avoid heavily congested areas.

An online gaming company is introducing several new initiatives to encourage respectful communication between players of online games. Which of the following best describes a solution that uses crowdsourcing?

• The company allows individual players to endorse fellow players based on courteous interactions. Once a player receives enough endorsements, the player is given free rewards that can be used during gameplay.

• The company eliminates chat from gameplay and sets the default chat policy to off. Players must actively turn on chat to converse outside of gameplay.

• The company introduces software that monitors all chats. Inappropriate conversations are identified, and players involved in the conversations are banned from the game.

• The company updates the acceptable content guidelines to explicitly describe appropriate and inappropriate behavior. All players must electronically sign an agreement to adhere to the guidelines.

In the following code segment, score and penalty are initially positive integers. The code segment is intended to reduce the value of score by penalty. However, if doing so would cause score to be negative, score should be assigned the value 0.

For example, if score is 20 and penalty is 5, the code segment should set score to 15.If score is 20 and penalty is 30, score should be set to 0.

The code segment does not work as intended.

Line 1: IF(score - penalty < 0)

Line 2: {

Line 3:    score ← score - penalty

Line 4: }

Line 5: ELSE

Line 6: {

Line 7:    score ← 0

Line 8: }

Which of the following changes can be made so that the code segment works as intended?

• 
  Changing line 1 to IF(score < 0)

• Changing line 1 to IF(score + penalty < 0)

• Changing line 7 to score ← score + penalty

• Interchanging lines 3 and 7

Which of the following research proposals is most likely to be successful as a citizen science project?

• Collecting pictures of birds from around the world that can then be analyzed to determine how location affects bird size

• Monitoring a group of cells in a laboratory to determine how growth rate is affected by exposure to varying temperatures

• Using a simulation to determine which one from a set of chemicals causes the most significant change to local animal and plant life

• Using specialized equipment to perform three-dimensional scans of complex proteins found in human cells

Consider a game where a player spins a wheel divided into four identical sections, labeled A, B, C, and D. If the player spins A, the score is 10. If the player spins B, the score is 5. If the player spins C or D, the score is -1.

The following code segment is intended to implement the game.

Which of the following could be used as a replacement for <MISSING STATEMENT> so the code segment works as intended?

• 
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• 
• 

Consider the following code segment. Assume that index1 is a number between 1 and LENGTH(theList), inclusive, and index2 is a number between 2 and LENGTH(theList) - 1, inclusive.

theList ← [9, -1, 5, 2, 4, 8]

x ← theList[index1] + theList[index2]

What is the largest possible value that the variable x can have after the code segment executes?

• 17

• 14

• 11

• 4

A spinner is divided into three sections. The sector labeled Red is four times as large as each of the sectors labeled Blue and Yellow, which are of equal size.

The procedure below is intended to simulate the behavior of the spinner.

Which of the following can be used to replace <Missing Code> so that the procedure correctly simulates the spinner?

• 
• 
• 
• 

A code segment is intended to transform the list utensils so that the last element of the list is moved to the beginning of the list.

For example, if utensils initially contains  ["fork", "spoon", "tongs", "spatula", "whisk"], it should contain ["whisk", "fork", "spoon", "tongs", "spatula"] after executing the code segment.

Which of the following code segments transforms the list as intended?

• len ← LENGTH(utensils)

  temp ← utensils[len]

  REMOVE(utensils, len)

  APPEND(utensils, temp)

• len ← LENGTH(utensils)

  REMOVE(utensils, len)

  temp ← utensils[len]

  APPEND(utensils, temp)

• len ← LENGTH(utensils)

  temp ← utensils[len]

  REMOVE(utensils, len)

  INSERT(utensils, 1, temp)

• len ← LENGTH(utensils)

  REMOVE(utensils, len)

  temp ← utensils[len]

  INSERT(utensils, 1, temp)