Question 1

Xerox PARC was established as a research lab where some of the world's best computer scientists and designers could work to improve modern computer technology.

Accepted Answer

Xerox PARC (Palo Alto Research Center Incorporated) was established by Xerox Corporation in 1970 as a research lab where many pioneering computer technologies such as the graphical user interface (GUI), Ethernet, laser printing, and the mouse were developed, significantly advancing modern computer technology.

Question 2

Local area networks, the laser printer, and the Graphical User Interface (GUI) were all developed or refined at Xerox PARC.

Accepted Answer

Xerox PARC (Palo Alto Research Center Incorporated), established in 1970, was instrumental in developing or significantly refining these technologies during the 1970s and early 1980s.

Question 3

A command-driven interface has icons on the computer screen and a mouse to control a pointer that can be used to operate the computer.

Accepted Answer

A command-driven interface relies on text commands entered by the user through a keyboard, without the use of icons or a mouse pointer for operation.

Question 4

Almost any method can serve as an event handler.

Accepted Answer

In programming, particularly in event-driven environments like web development, almost any method can be designated as an event handler as long as it can be called in response to an event, such as a user action or a system-generated event.

Question 5

When an event handler detects an event trigger, an event listener is called into action.

Accepted Answer

An event listener is what detects an event and calls an event handler into action to respond to the event.

Question 6

There are five different event types in Alice.

Accepted Answer

Alice supports various event types, but the specific number can vary depending on the version of Alice being used. The core event types typically include but are not limited to mouse events, keyboard events, and timer events, not limited to just five.

Question 7

If an object is facing the positive direction on a straight line (marked with a scale of measurement), toward higher numbers, its orientation would be forward.

Accepted Answer

In a coordinate system or on a scale of measurement, moving towards higher numbers from a given point is typically considered moving forward, assuming the positive direction is defined in the direction of increasing values.

Question 8

An object facing the negative direction on a straight line (marked with a scale of measurement), toward lower numbers, would be facing backward.

Accepted Answer

An object facing the negative direction on a straight line is moving toward lower numbers, which means it is moving backward.

Question 9

In front of and behind are two object-relative positions.

Accepted Answer

"In front of" and "behind" describe positions relative to an object, indicating spatial relationships where one object is ahead of or in back of another.

Question 10

A flat surface is three-dimensional.

Accepted Answer

A flat surface is considered two-dimensional because it has only length and width, but no height.

Question 11

A flat, two-dimensional surface is called a frame.

Accepted Answer

A flat, two-dimensional surface is typically referred to as a plane, not a frame. A frame usually refers to a structure that outlines or encloses such as a picture frame or the framework of a building.

Question 12

Cartesian coordinates have an X-axis and a Y-axis.

Accepted Answer

Cartesian coordinates are defined by two axes: the X-axis (horizontal) and the Y-axis (vertical), which intersect at a point called the origin.

Question 13

In Cartesian coordinates, the Y-axis value is always listed first.

Accepted Answer

In Cartesian coordinates, the X-axis value is listed first, followed by the Y-axis value.

Question 14

Moving up or down off a flat plane requires a third axis and a third number to indicate how far a point is above or below the plane.

Accepted Answer

In a three-dimensional space, moving up or down off a flat plane indeed requires a third axis (commonly the z-axis) and a third number to indicate the position's elevation relative to the plane. This is because the first two axes (x and y) only allow movement within the plane itself.

Question 15

The physical world around us is a two-dimensional space.

Accepted Answer

The physical world around us is a three-dimensional space, consisting of length, width, and height.

Question 16

In Alice's Euclidean 3-space, there are six object-relative directions, one opposing pair of directions for each axis.

Accepted Answer

In Euclidean 3-space, there are three axes (x, y, and z), and for each axis, there is a pair of opposing directions (e.g., left-right, up-down, forward-backward), totaling six object-relative directions.

Question 17

In Alice, there are eight object-relative positions.

Accepted Answer

In Alice, there are six standard object-relative positions: left, right, up, down, forward, and backward.

Question 18

Whenever the create new event button is clicked, a list of the nine event types in Alice appears.

Accepted Answer

The question states that "a list of the nine event types in Alice appears" when the "create new event button" is clicked. This implies that the nine event types are displayed, which is true.

Question 19

Alice has a When a key is typed event that will cause a method to run whenever a particular key is pressed.

Accepted Answer

The "When a key is typed" event in programming environments (such as those found in game development or GUI applications) is designed to trigger a specific method or function when a user presses a designated key, allowing for interactive and responsive software behavior.

Question 20

The default menu choice in the When a key is typed event tile is number key.

Accepted Answer

The default menu choice in the "When a key is typed" event tile is "any key," not "number key."

Quiz 3: Events