Question 1

Which type of events focus on responding to finger touches on a touchscreen?
A)Drag events
B)Pointer events
C)Touch events
D)Mouse events

Accepted Answer

Touch events are specifically designed to respond to finger touches on a touchscreen. Drag events are similar, but specifically involve moving an object on the touchscreen by dragging it with a finger. Pointer events refer to any type of pointing device, including a mouse, touchscreen, or stylus. Mouse events are specific to a computer mouse and do not apply to touchscreen interactions.

Question 2

Which type of events aim to handle input from a mouse, finger, or stylus with each event?
A)Drag events
B)Pointer events
C)Touch events
D)Mouse events

Accepted Answer

Pointer events are the most appropriate type of events for handling input from a mouse, finger, or stylus because they encompass all of these input methods. Drag events are specifically designed for handling the dragging or movement of an object, touch events are specifically tailored to handle touch-based input on touchscreens, and mouse events are designed for input from a mouse device only.

Question 3

The touchstart event is roughly analogous to the ____ event.
A) click
B) mouseup
C) mousedown
D) mouseover

Accepted Answer

The touchstart event is initiated when a user touches a touchscreen interface, which is roughly analogous to the mousedown event in mouse-driven interfaces. Both events represent the initial point of contact—mousedown when the mouse button is pressed, and touchstart when the screen is touched.

Question 4

A device's ____ detects its orientation in space.
A)gyroscope
B)camera
C)accelerometer
D)battery

Accepted Answer

A gyroscope primarily detects a device's orientation in space, while a camera captures images and videos, an accelerometer measures changes in motion and velocity, and a battery powers the device.

Question 5

To continually monitor a user's position, you use the ____ method of the Geolocation API.
A) getCurrentPosition()
B)watchPosition()
C)clearWatch()
D)latitude()

Accepted Answer

To continually monitor a user's position, we use the watchPosition() method of the Geolocation API. This method tracks the user's position and returns updated location information as the user moves. getCurrentPosition() is used to get the user's current location only once, while clearWatch() is used to stop tracking the user's location. latitude() is not a method of the Geolocation API.

Question 6

The mobile versions of popular browsers share all the same  capabilities, limitations, and even bugs as their desktop counterparts.

Accepted Answer

Mobile versions of popular browsers are designed differently from their desktop counterparts, often with variations in capabilities, limitations, and bugs due to the different hardware, operating systems, and use cases of mobile devices.

Question 7

You access methods of the Geolocation API using the geolocation property of the ____ object.
A) Screen
B) Window
C) Navigator
D) Location

Accepted Answer

The geolocation property is a part of the Navigator object that contains information about the browser. So, the correct choice is C (Navigator).

Question 8

Which event is fired when a user moves a finger off the screen or outside of an object's containing element?
A) touchstart
B) touchmove
C) touchend
D) touchcancel

Accepted Answer

The touchcancel event is fired when a touch event is interrupted, typically due to the user moving their finger off the screen or outside of an object's containing element. This is different from touchend, which is only fired when the user releases their finger from the screen while it is still over the object. Therefore, D is the best choice.

Question 9

Which of the following is a touch event?
A) touchend
B) mousedown
C) pointermove
D) clientY

Accepted Answer

Touchend is a touch event that is fired when a touch point is removed from the touch surface.

Question 10

A device's ____ detects changes in speed.
A)gyroscope
B)camera
C)accelerometer
D)battery

Accepted Answer

The accelerometer is a sensor that detects changes in speed or acceleration of the device. It is commonly used in smartphones to switch between portrait and landscape modes when the device is rotated and to track fitness activities.

Question 11

The success and fail arguments of the getCurrentPosition()method, which are executable code, are examples of ____ .
A)API keys
B)properties
C) callbacks
D)minifiers

Accepted Answer

The success and fail arguments of the getCurrentPosition() method are callbacks. The success callback is executed when the position is successfully obtained, while the fail callback is executed when there is an error obtaining the position. Thus, these arguments can be used as callbacks to handle the successful or failed retrieval of the current position.

Question 12

To disable interface gestures in response to pointer events, you change the value off the ____ property.
A) touches
B) clientX
C) touchAction
D) msTouchAction

Accepted Answer

The answer of To disable interface gestures in response to...

Question 13

The Geolocation API p rovides access to device orientation and changes in orientation.

Accepted Answer

The Geolocation API provides access to geographical location information, not device orientation. Device orientation and motion are handled by the Device Orientation API.

Question 14

Which of the following is a mouse event?
A) touchstart
B) click
C) pointerup
D) clientX

Accepted Answer

Click is a mouse event that occurs when the user clicks the mouse button. Touchstart is a touch event that occurs on a touch screen device. Pointerup is a generic event that can be triggered by any pointing device including a mouse, touch screen, or stylus. ClientX is a property of the event object that specifies the horizontal coordinate of the mouse pointer relative to the client area of the browser window.

Question 15

Pointer events do not aim to handle input from  a mouse.

Accepted Answer

Pointer events aim to handle input from different pointing devices including mouse, touchpads, stylus pens, etc.

Question 16

Which of the following is NOT removed when minifying a file?
A) spaces
B)comments
C)indents
D)line breaks

Accepted Answer

The answer of Which of the following is NOT removed...

Question 17

On a touchscreen device without a mouse, most browsers fire the click event when a  user touches the screen.

Accepted Answer

This is true. Most browsers interpret a touchscreen tap as equivalent to a mouse click and will fire the click event.

Question 18

To request a user's position a single time, you use the ____ method of the Geolocation API.
A) getCurrentPosition()
B)watchPosition()
C)clearWatch()
D)latitude()

Accepted Answer

The getCurrentPosition() method is used to request the user's position only one time. It takes a success callback function and an optional error callback function as arguments. The success function will be called with a Position object containing the user's current position.

Question 19

Touch events are built to  allow for multiple touches on the screen at the same  time.

Accepted Answer

Touch events support multiple touches on the screen simultaneously.

Question 20

Which of the following is a pointer event?
A) touchcancel
B) mouseout
C) pointerdown
D) clientX

Accepted Answer

pointerdown is a pointer event that triggers when a pointer device is first detected on the screen, such as when the user touches the screen or clicks with a mouse. touchcancel and mouseout are also pointer events, but they were not the best choice for this question. clientX is a property that represents the horizontal coordinate of a pointer event, not an event itself.

Quiz 10: Programming for Mobile Devices and Touchscreens

Which type of events focus on responding to finger touches on a touchscreen?

Which type of events aim to handle input from a mouse, finger, or stylus with each event?

The touchstart event is roughly analogous to the ____ event.

A device's ____ detects its orientation in space.

To continually monitor a user's position, you use the ____ method of the Geolocation API.

The mobile versions of popular browsers share all the same capabilities, limitations, and even bugs as their desktop counterparts.

You access methods of the Geolocation API using the geolocation property of the ____ object.

Which event is fired when a user moves a finger off the screen or outside of an object's containing element?

Which of the following is a touch event?

A device's ____ detects changes in speed.

The success and fail arguments of the getCurrentPosition() method, which are executable code, are examples of ____ .

To disable interface gestures in response to pointer events, you change the value off the ____ property.

The Geolocation API p rovides access to device orientation and changes in orientation.

Which of the following is a mouse event?

Pointer events do not aim to handle input from a mouse.

Which of the following is NOT removed when minifying a file?

On a touchscreen device without a mouse, most browsers fire the click event when a user touches the screen.

To request a user's position a single time, you use the ____ method of the Geolocation API.

Touch events are built to allow for multiple touches on the screen at the same time.

Which of the following is a pointer event?