A user wants to save a data file on an online storage site. The user wants to reduce the size of the file, if possible, and wants to be able to completely restore the file to its original version. Which of the following actions best supports the user’s needs?

Compressing the file using a lossless compression algorithm before uploading it

Compressing the file using a lossy compression algorithm before uploading it

Compressing the file using both lossy and lossless compression algorithms before uploading it

Uploading the original file without using any compression algorithm

Consider the following code segment. What are the values of first and second as a result of executing the code segment?

The value of first is true, and the value of second is true.

The value of first is true, and the value of second is false.

The value of first is false, and the value of second is true.

The value of first is false, and the value of second is false.

A student is creating an application that allows customers to order food for delivery from a local restaurant. Which of the following is LEAST likely to be an input provided by a customer using the application?

The cost of a food item currently available for order

The address where the order should be delivered

The credit card or payment information for the purchaser

The name of a food item to be included in the delivery

The diagram below shows a circuit composed of two logic gates labeled OR and AND . Each gate takes two inputs and produces a single output. If the inputs A and C are both true , which of the following best describes the output of the AND gate?

The output will be true no matter what the value of input B is.

The output will be false no matter what the value of input B is.

The output will be true if input B is true ; otherwise it will be false .

The output will be false if input B is true; otherwise it will be true .

Which of the following questions about a particular animal could NOT be answered using only the data collected from the tracking collars?

Do the movement patterns of the animal vary according to the weather?

Approximately how many miles did the animal travel in one week?

Does the animal travel in groups with other tracked animals?

In what geographic locations does the animal typically travel?

The position of a runner in a race is a type of analog data. The runner’s position is tracked using sensors. Which of the following best describes how the position of the runner is represented digitally?

The position of the runner is sampled at regular intervals to approximate the real-word position, and a sequence of bits is used to represent each sample.

The position of the runner is determined by calculating the time difference between the start and the end of the race and making an estimation based on the runner’s average speed.

The position of the runner is measured and rounded to either 0 or 1 depending on whether the runner is closer to the starting line or closer to the finish line.

The position of the runner is predicted using a model based on performance data captured from previous races.

Which of the following are benefits of using well-named variables in a computer program?

The program will be easier for people to read.

The program will be easier to modify in the future.

The program will have a greater data storage capacity.

Which of the following is a benefit of using a list as a data abstraction in a program?

Lists often allow their size to be easily updated to hold as many data values as needed.

Lists convert all elements to strings so that they can be inspected character-by-character.

Lists prevent duplicate data values from appearing in the list.

Lists are used to store all input data so that there is a running record of all user input.

A programmer wants to determine whether a score is within 10 points of a given target. For example, if the target is 50, then the scores 40, 44, 50, 58, and 60 are all within 10 points of the target, while 38 and 61 are not. Which of the following Boolean expressions will evaluate to true if and only if score is within 10 points of target ?

(target - 10 ≤ score) AND (score ≤ target + 10)

(score ≤ target + 10) AND (target + 10 ≤ score)

(target + 10 ≤ score) AND (score ≤ target - 10)

(score ≤ target - 10) AND (score ≤ target + 10)

Which of the following expressions will evaluate to true if the restaurant should be counted and evaluates to false otherwise?

(avgRating ≥ 4.0) AND ((prcRange = "lo") OR (prcRange = "med"))

(avgRating ≥ 4.0) AND ((prcRange = "lo") AND (prcRange = "med"))

(avgRating ≥ 4.0) OR ((prcRange = "lo") AND (prcRange = "med"))

(avgRating ≥ 4.0) OR ((prcRange = "lo") OR (prcRange = "med"))

Consider the following numeric values. Binary 1011 Binary 1101 Decimal 5 Decimal 12 Which of the following lists the values in order from least to greatest?

Decimal 5, binary 1011, decimal 12, binary 1101

Decimal 5, decimal 12, binary 1011, binary 1101

Decimal 5, binary 1011, binary 1101, decimal 12

Binary 1011, binary 1101, decimal 5, decimal 12

A programmer is creating an algorithm that will be used to turn on the motor to open the gate in a parking garage. The specifications for the algorithm are as follows. The gate should not open when the time is outside of business hours. The motor should not turn on unless the gate sensor is activated. The motor should not turn on if the gate is already open. Which of the following algorithms can be used to open the gate under the appropriate conditions?

Check if the time is during business hours. If it is, check if the gate sensor is activated. If it is, check if the gate is open. If it is not, turn on the motor.

Check if the time is outside of business hours. If it is, check if the gate sensor is activated. If it is, check if the gate is closed. If it is, turn on the motor.

Check if the time is during business hours. If it is, check if the gate sensor is activated. If it is, check if the gate is open. If it is, turn on the motor.

Check if the time is during business hours. If it is, check if the gate sensor is activated. If it is not, check if the gate is open. If it is not, turn on the motor.

Which of the following best explains how data is transmitted on the Internet?

Data is broken into packets, which can be sent along different paths.

Data is broken into packets, which are all sent to the recipient in a specified order along the same path.

All data is transmitted in a single packet through a direct connection between the sender and the recipient.

Multiple data files are bundled together in a packet and transmitted together.

A person wants to transmit an audio file from a device to a second device. Which of the following scenarios best demonstrates the use of lossless compression of the original file?

A device compresses the audio file before transmitting it to a second device. The second device restores the compressed file to its original version before playing it.

A device compresses the audio file by removing details that are not easily perceived by the human ear. The compressed file is transmitted to a second device, which plays it.

A device transmits the original audio file to a second device. The second device removes metadata from the file before playing it.

A device transmits the original audio file to a second device. The second device plays the transmitted file as is.

Which of the following algorithms display all integers between 1 and 20, inclusive, that are not divisible by 3 ?

Step 1: Set x to 0. Step 2: Increment x by 1. Step 3: If x is not divisible by 3, then display x. Step 4: Repeat steps 2 and 3 until x is 20.

1: Set x to 1. Step 2: If x is divisible by 3, then do nothing; otherwise display x.Step 3: Increment x by 1. Step 4: Repeat steps 2 and 3 until x is greater than 20.

Set x to 0. Step 2: Ifxis divisible by 3, then displayx.Step 3: Increment x by 1. Step 4: Repeat steps 2 and 3 untilxis greater than 20.

: Set x to 1. Step 2: If x is divisible by 3, then do nothing; otherwise display x.Step 3: Increment x by 1. Step 4: Repeat steps 2 and 3 until x is 20.

Which of the following is a true statement about data compression?

There are trade-offs involved in choosing a compression technique for storing and transmitting data.

Data compression is only useful for files being transmitted over the Internet.

Regardless of the compression technique used, once a data file is compressed, it cannot be restored to its original state.

Sending a compressed version of a file ensures that the contents of the file cannot be intercepted by an unauthorized user.

A city government is attempting to reduce the digital divide between groups with differing access to computing and the Internet. Which of the following activities is LEAST likely to be effective in this purpose?

Putting all government forms on the city Web site

Holding basic computer classes at community centers

Providing free wireless Internet connections at locations in low-income neighborhoods

Requiring that every city school has computers that meet a minimum hardware and software standard

A programmer has a need to round many numeric values to the nearest integer. Which of the following best explains the benefit of using a list as a data abstraction in this situation?

Keeping the numeric values in a list makes it easier to apply the same computation to every data element.

Keeping the numeric values in a list makes it easier to round a number to the nearest integer.

Keeping the numeric values in a list makes it easier to prevent a program from unintentionally changing the value of a variable.

Keeping the numeric values in a list makes it easier to prevent a program from attempting to access an index beyond the length of the list.

The question below uses a robot in a grid of squares. The robot is represented as a triangle, which is initially in the center square and facing toward the top of the grid. The following code segment is used to move the robot in the grid. count ←← 1 REPEAT 4 TIMES { REPEAT count TIMES { MOVE_FORWARD() } ROTATE_LEFT() count ←← count + 1 } Which of the following code segments will move the robot from the center square along the same path as the code segment above? Responses

count ←← 0 REPEAT 4 TIMES { count ←← count + 1 REPEAT count TIMES { MOVE_FORWARD() } ROTATE_LEFT() }

count ←← 0 REPEAT 4 TIMES { count ←← count + 1 ROTATE_LEFT() REPEAT count TIMES { MOVE_FORWARD() } }

count ←← 0 REPEAT 4 TIMES { REPEAT count TIMES { ROTATE_LEFT() } MOVE_FORWARD() count ←← count + 1 }

count ←← 0 REPEAT 4 TIMES { ROTATE_LEFT() REPEAT count TIMES { MOVE_FORWARD() } count ←← count + 1 }

In which of the following situations would it be most appropriate to choose lossy compression over lossless compression?

Storing music files on a smartphone in order to maximize the number of songs that can be stored

Storing digital photographs to be printed and displayed in a large format in an art gallery

Storing a formatted text document to be restored to its original version for a print publication

Storing a video file on an external device in order to preserve the highest possible video quality

A binary number is to be transformed by appending three 0s to the end of the number. For example, 11101 is transformed to 11101000. Which of the following correctly describes the relationship between the transformed number and the original number?

The transformed number is 8 times the value of the original number.

The transformed number is 3 times the value of the original number.

The transformed number is 4 times the value of the original number.

The transformed number is 1,000 times the value of the original number.

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 = 5, gradePointAverage = 3.8

numberOfAbsences = 3, gradePointAverage = 3.5

numberOfAbsences = 6, gradePointAverage = 3.4

numberOfAbsences = 6, gradePointAverage = 3.6

Which of the following is LEAST likely to be a contributing factor to the digital divide?

Some parents prefer to limit the amount of time their children spend using computing devices or the Internet.

Some individuals and groups are economically disadvantaged and cannot afford computing devices or Internet connectivity.

Some individuals and groups do not have the necessary experience or education to use computing devices or the Internet effectively.

Some residents in remote regions of the world do not have access to the infrastructure necessary to support reliable Internet connectivity.

A teacher is writing a code segment that will use variables to represent a student’s name and whether or not the student is currently absent. Which of the following variables are most appropriate for the code segment?

A string variable named studentName and a Boolean variable named isAbsent

A string variable named s and a Boolean variable named a

A string variable named s and a numeric variable named n

A string variable named studentName and a numeric variable named numAbsences

A media librarian at a movie studio is planning to save digital video files for archival purposes. The movie studio would like to be able to access full-quality videos if they are needed for future projects. Which of the following actions is LEAST likely to support the studio’s goal?

Using lossy compression software to reduce the size requirements of the data being stored

Using video file formats that conform to published standards and are supported across many different devices

Using storage media that can be expanded for additional data capacity

Using a system that incorporates redundancy to handle disk failure

Which of the following is a characteristic of the fault-tolerant nature of routing on the Internet?

The ability to provide data transmission even when some connections have failed

The ability to use a hierarchical naming system to avoid naming conflicts

The ability to resolve errors in domain name system (DNS) lookups

The ability to use multiple protocols such as hypertext transfer protocol (HTTP), Internet protocol (IP), and simple mail transfer protocol (SMTP) to transfer data

Which of the following best explains how data is typically assembled in packets for transmission over the Internet?

Each packet contains data to be transmitted, along with metadata containing information used for routing the data.

Each packet contains an encrypted version of the data to be transmitted, along with metadata containing the key needed to decrypt the data.

Each packet contains only the metadata used to establish a direct connection so that the data can be transmitted.

Each packet contains multiple data files bundled together, along with metadata describing how to categorize each data file.

Which of the following school policies is most likely to have a positive impact on the digital divide?

A school provides a laptop or tablet computer to all students enrolled at the school.

A school allows students to bring a graphing calculator from home to complete in-class mathematics assignments.

A school allows students to bring a tablet computer to class every day to participate in graded quizzes.

A school recommends that all students purchase a computer with as much processing speed as possible so that projects run faster.

Final Review 60Q

Authored by Vision Pathak

Computers

8th Grade

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60 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

To qualify for a particular scholarship, a student must have an overall grade point average of 3.0 or above and must have a science grade point average of over 3.2. Let overallGPA represent a student’s overall grade point average and let scienceGPA represent the student’s science grade point average. Which of the following expressions evaluates to true if the student is eligible for the scholarship and evaluates to false otherwise?

(overallGPA > 3.0) AND (scienceGPA > 3.2)

(overallGPA > 3.0) AND (scienceGPA ≥ 3.2)

(overallGPA ≥ 3.0) AND (scienceGPA > 3.2)

(overallGPA ≥ 3.0) AND (scienceGPA ≥ 3.2)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following code segment is used to determine whether a customer is eligible for a discount on a movie ticket.
val1 ←← (NOT (category = "new")) OR (age ≥ 65)
val2 ←← (category = "new") AND (age < 12)
If category is "new" and age is 20, what are the values of val1 and val2 as a result of executing the code segment?

val1 = true, val2 = true

val1 = true, val2 = false

val1 = false, val2 = true

val1 = false, val2 = false

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes a direct benefit in using redundant routing on the Internet?

Redundancy enables messages to be transmitted with as few packets as possible.

Redundancy enables network devices to communicate with as few network connections as possible.

Redundancy often allows messages to be sent on the network even if some network devices or connections have failed.

Redundancy prevents network communications from being intercepted by unauthorized individuals.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following code segment is intended to set max equal to the maximum value among the integer variables x, y, and z. The code segment does not work as intended in all cases.
Which of the following initial values for x, y, and z can be used to show that the code segment does not work as intended?

x = 1, y = 2, z = 3

x = 1, y = 3, z = 2

x = 2, y = 3, z = 1

x = 3, y = 2, z = 1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Consider the code segment below.
Which of the following changes will NOT affect the results when the code segment is executed?

Changing line 3 to b10

Changing line 3 to b+10

Changing line 7 to

b20

Changing line 7 to b+20

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A certain social media Web site allows users to post messages and to comment on other messages that have been posted. When a user posts a message, the message itself is considered data. In addition to the data, the site stores the following metadata.
- The time the message was posted
- The name of the user who posted the message
- The names of any users who comment on the message and the times the comments were made
For which of the following goals would it be more useful to analyze the data instead of the metadata?

To determine the users who post messages most frequently

To determine the time of day that the site is most active

To determine the topics that many users are posting about

To determine which posts from a particular user have received the greatest number of comments

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a true statement about program documentation?

Program documentation should not be changed after it is first written.

Program documentation is only needed for programs in development; it is not needed after a program is completed.

Program documentation is useful when programmers collaborate but not when a programmer works individually on a project.

Program documentation is useful during initial program development and also when modifications are made to existing programs.

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Final Review 60Q

Which of the following best describes a direct benefit in using redundant routing on the Internet?

The following code segment is intended to set max equal to the maximum value among the integer variables x, y, and z. The code segment does not work as intended in all cases.Which of the following initial values for x, y, and z can be used to show that the code segment does not work as intended?

Consider the code segment below.Which of the following changes will NOT affect the results when the code segment is executed?

Which of the following is a true statement about program documentation?

A user wants to save a data file on an online storage site. The user wants to reduce the size of the file, if possible, and wants to be able to completely restore the file to its original version. Which of the following actions best supports the user’s needs?

Consider the following code segment.What are the values of first and second as a result of executing the code segment?

A student is creating an application that allows customers to order food for delivery from a local restaurant. Which of the following is LEAST likely to be an input provided by a customer using the application?

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The following code segment is intended to set max equal to the maximum value among the integer variables x, y, and z. The code segment does not work as intended in all cases.
Which of the following initial values for x, y, and z can be used to show that the code segment does not work as intended?

Consider the code segment below.
Which of the following changes will NOT affect the results when the code segment is executed?

Consider the following code segment.
What are the values of first and second as a result of executing the code segment?