Unit 1 Self-Check Questions

AAP-2.D

Which two of the following sentences could be reported by gossip?
gossip: (report (join (who) ( ) (does what) ( ) (who)))

For reference:
who reporter block definition: report (item (random) of (list (Señora) (Ms. C) (my cat) (Hannah) (Jake)))

does what reporter block definition: report (item (random) of (list (listened to) (loves) (ran away from) (helped) (is in a band with)))

Señora and Ms. C helped.

It's true that there are two people (two "who"s) and one action (one "does what"), but they aren't in the right order. Also, the word "and" isn't anywhere in the program.

Señora ran away from my cat.

Correct! This follows the pattern: "who," "does what," "who."

Hannah listened to Hannah.

Correct! This follows the pattern: "who," "does what," "who."

Jake helped.

This sentence is missing the second "who."

from Lab 2, Page 5

AAP-3.E

more complicated who {
if (pick random (1) to (4)) = (3) {
report (join (who) (', who') (does what) ( ) (who) (,))
} else {
report (who)
}
}

About how often will more complicated who pick the more complicated choice?

Half the time

If a number is chosen randomly from 1, 2, 3, and 4, about how often will that number be 3?

A third of the time

If a number is chosen randomly from 1, 2, 3, and 4, about how often will that number be 3?

A quarter of the time

Correct!

Three quarters of the time

If a number is chosen randomly from 1, 2, 3, and 4, about how often will that number be 3?

from Lab 2, Page 5

AAP-3.E

Here is the script inside more complicated who. What change to this script will make the more complicated phrase appear more often?

Change the 4 to 5.

Then three will be the randomly chosen number one out of five times instead of one out of four, and so we'll have a complicated subject less often.

Change the 4 to 3.

Correct! Three will then be the chosen number one out of three times, and so we'll have a complicated subject more often.

Change the 3 to 1.

1 is just as likely a random choice as 3, one out of four times, and we'll have a complicated subject just as often as before.

Change the 3 to 5.

The chosen number can never be 5, so we'll never get a complicated subject.

from Lab 2, Page 5

AAP-3.E

Click for a review of odd and even numbers.

An even number is an integer that is divisible by 2 (such as 2, 14, 0, -4, -6, -28, and -176).

In contrast, odd numbers are integers not divisible by 2 (such as 1, 3, 9, 17, -5, -33, and -221).

Which expression will return a random even number between 1 and 10?

RANDOM(2, 10)

RANDOM(2, 10)

will return 2, 3, 4, 5, 6, 7, 8, 9, or 10.

2 * RANDOM(1, 5)

Correct!

RANDOM(1, 5)

will return 1, 2, 3, 4, or 5, and so

2 * RANDOM(1, 5)

will return 2, 4, 6, 8, or 10.

RANDOM(1, 10) / 2

RANDOM(1, 10)

will return 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and so

RANDOM(1, 10) / 2

will return ½, 1, 1 ½, 2, 2 ½, 3, 3 ½, 4, 4 ½, 5.

RANDOM(1, 5)

RANDOM(1, 5)

will return 1, 2, 3, 4, or 5.

from Lab 2, Page 5

AAP-3.E

Which expression will simulate the rolling of two dice?

RANDOM(1, 6) + RANDOM(1, 6)

Correct!

RANDOM(1, 6)

will return 1, 2, 3, 4, 5, or 6 with equal probability, simulating one die, and so

RANDOM(1, 6) + RANDOM(1, 6)

will return 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 with the same probability as two dice.

2 * RANDOM(1, 6)

You have the right idea, using

RANDOM(1, 6)

for the roll of a single die. But this expression doesn't roll two dice; it rolls one die and doubles the result. So

2 * RANDOM(1, 6)

will only return 2, 4, 6, 8, 10, or 12.

RANDOM(2, 12)

RANDOM(2, 12)

will return 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 equally often. Do you score 2 rolling two dice as often as you score 6?

RANDOM(1, 12)

Can you score a total of 1 by rolling two dice?

from Lab 3, Page 1

AAP-2.A.1

Which of the following are examples of algorithms?

Snap! code that adds two numbers together.

This is an example of an algorithm, but it's not the only one on this list.

Directions for how to get from one point to another on a map.

This is an example of an algorithm, but it's not the only one on this list.

A sequence of different moves you do in a video game.

This is an example of an algorithm, but it's not the only one on this list.

A recipe to bake a cake with precise measurements and instructions.

This is an example of an algorithm, but it's not the only one on this list.

from Lab 3, Page 2

What shape would the following script draw?
clear; pen down; repeat (5) {move (100) steps; turn right (360-divided-by-5) degrees}

Correct! The turn angles, number of steps, and number of turns needed to make this shape matches the script.

This shape requires the sprite to move backwards in addition to moving forward.

figure with five sides, but not a closed polygon

The turn angles needed to make this shape do not match the script.

The number of turns, turn angles, and number of steps moved needed to make this shape does not match the script.

from Lab 3, Page 3

CRD-2.G.2

Consider these two scripts, and check all that are true.
pen down; repeat (10) {move (10) steps; turn right (15) degrees}

pen down (with comment: set pen color to green); repeat (10) {move (10) steps; turn right (15) degrees}

Both scripts have the same behavior.

Correct! One script has a comment, but it doesn’t change how the program runs.

One script has a comment, but it doesn’t change how the program runs.

Correct! Adding a comment does not change the script.

In one script, the pen color will be green.

Adding a comment will not change the behavior of the script.

The script with the comment will not run.

A script will run exactly the same way with or without a comment.

from Lab 3, Page 4

AAP-3.B.4

If you were trying to make the image below, what correctly describes the choice of whether or not to use a procedure to draw the pinwheels?
assortment of pinwheels

A procedure should not be used in this case because the pinwheels are too different from each other.

Procedures can handle variations by using parameters.

A procedure could improve the efficiency of drawing pinwheels, resulting in faster drawing of the image on the screen.

While procedures can improve efficiency, it will not change the drawing time for this project.

A procedure would allow for random placement of pinwheels, adding artistic variation to the image.

Using a procedure does not change whether or not new pinwheels are placed randomly.

A procedure would facilitate code reuse, enabling easy replication of pinwheel designs with different input parameters.

Correct! Using procedures promotes code reuse and adaptability for different pinwheel designs.

from Lab 3, Page 5

AAP-3.B.5

Which statement best illustrates the importance of using parameters in programming procedures (such as number of branches in the pinwheel code)?

Parameters restrict the flexibility of procedures, making them applicable to only specific input values.

Parameters increase flexibility by allowing different input values.

Parameters make procedures harder to understand for beginners and should be avoided whenever possible.

Parameters can enhance understanding by making procedures adaptable.

Parameters enable procedures to be generalized, allowing them to be reused with various input values (arguments).

Correct! Parameters generalize procedures, enabling reuse with different inputs.

Parameters can be omitted without affecting the functionality of a procedure.

Parameters broaden the functionality of procedures.

from Lab 3, Page 6

AAP-2.J.1

Given the program code below, what will the output be?
for (i)=(1) to (4) {repeat (4) {move ((i)*(20)) steps; turn right (90) degrees}}

The pattern is not repeated the correct number of times.

Correct! The shape correctly shows increasing steps with four iterations and proper turning.

three nested squares, growing in a spiral

The pattern is not repeated the correct number of times.

The shape does not show the correct turn angle.

from Lab 4, Page 1

IOC-2.A.1

What is a potential effect of having your PII (personally identifiable information) shared online?

It may limit the number of advertisements you see.

Sharing PII does not limit advertisements.

It can be used for identity theft, harassment, or fraud.

Correct! Shared PII can be exploited for identity theft, harassment, or fraud.

It increases the efficiency of your internet browsing.

Sharing PII does not improve internet browsing efficiency.

It automatically updates your software.

PII sharing does not relate to software updates.

from Lab 4, Page 2

IOC-2.A.5

By selling data to third parties without the consumer's consent, a company is doing which of the following?

Misusing customer data for company profit.

Correct! Selling data without consent is misuse for profit.

Using customer data to improve product quality.

Selling data without consent does not improve product quality.

Storing it securely in the third party’s database systems.

The issue is not about secure storage but unauthorized selling.

Collaborating with customers to enhance data protection.

Selling data without consent does not enhance data protection.

from Lab 4, Page 2

IOC-2.A.8

Which of the following is an example of how PII and other information collected by a website can be used to benefit the user?

Improving user experience.
Restricting access to information based on geographical location.
Providing personalized services.

i only

Improving user experience is a benefit, but it’s not the only one.

ii only

Restricting access doesn't directly benefit the user.

i and ii

Restricting access doesn't directly benefit the user.

i and iii

Correct! Improving user experience and providing personalized services benefit users are both benefits.

from Lab 4, Page 4

IOC-1.F.11

What is the primary reason why facial recognition technology is considered controversial?

Because it is less accurate than traditional identification methods.

Facial recognition can be highly accurate.

Due to its potential for misuse in surveillance and privacy violations.

Correct! The primary controversy is its potential for misuse and privacy violations. Computing innovations can raise legal and ethical concerns such as these.

Because it requires high computational power.

While it may require computational power, this is not the main controversy.

It is only available to high-end devices.

While access to technology does raise some ethical concerns, availability is not the primary concern with facial recognition technology.

from Lab 4, Page 4

IOC-2.A.3

What type of data can websites collect about their visitors without their knowledge?

Only the visitor's name and email address

Websites can’t typically collect someone’s name and name and email without their knowledge.

Data related to the visitor's physical health

Data related to physical health is typically not collected by general websites without someone’s knowledge. However, someone's browsing history, which may include information about web searches regarding their health, might be.

Only the visitor's credit card information

Websites can’t typically collect someone’s credit card information without their knowledge.

Information like browsing history, preferences, and login details

Correct! Websites collect various data like browsing history, preferences, and login details without the visitors knowledge.

from Lab 5, Page 2

AAP-2.K.4

When the code below is executed, how many times will the sprite move 10 steps?
point in direction (90); go to x:(0) y:(0); repeat until ((x position)<(0)) {move (10) steps}

0 times

Repeat until repeats until the condition is true, not until it's false.

1 time

The code says <, not >.

10 times

The sprite moves more than ten times because the x position will always be greater than zero.

Forever

Correct! The x position will never be less than zero, so the sprite will continue to move in 10-step increments.

from Lab 5, Page 2

AAP-2.K.5

When the code below is executed, how many times does the sprite move 10 steps?
point in direction (90); go to x:(100) y:(0); repeat until ((x position)>(0)) {move (10) steps}

point in direction (90); go to x:(100) y:(0); repeat until ((x position)>(0)) {move (10) steps}

0 times

Correct! The sprite starts at an x position greater than zero, so the sprite won’t move at all.

1 time

Repeat until tests its condition before running the enclosed script.

10 times

The sprite does not move because it starts at an x position greater than zero.

Forever

The sprite does not move because it starts at an x position greater than zero.

Lab 2: Gossip

Lab 3: Modern Art with Polygons

Lab 4: Protecting Your Privacy

Lab 5: Follow the Leader