Question 1

JavaScript is a _______________ language
A)Object-Oriented
B)High-level
C)Assembly-language
D)Object-Based

Accepted Answer

D

Question 2

A conditional expression is also called a
A)Alternate to if-else
B)Immediate if
C)If-then-else statement
D)None of the above

Accepted Answer

A conditional expression, often referred to as the ternary operator in many programming languages, acts as an immediate if statement, allowing a simple if-else condition to be written in a single line or expression.

Question 3

The "var" and "function" are
A)Keywords
B)Declaration statements
C)Datatypes
D)Prototypes

Accepted Answer

"var" and "function" are used in JavaScript to declare variables and functions, respectively, making them declaration statements.

Question 4

The method or operator used to identify the array is
A)isarrayType()
B)==
C)===
D)typeof

Accepted Answer

The `typeof` operator is used to identify the type of an operand. For an array, `typeof` will return "object", as arrays are technically objects in JavaScript. However, it's worth noting that while `typeof` can be used to determine if something is an object, additional steps are needed to conclusively identify an object as an array, such as using `Array.isArray()`.

Question 5

What will happen if reverse() and join() methods are used simultaneously ?
A)Reverses and stores in the same array
B)Reverses and concatenates the elements of the array
C)Reverses
D)All of the above

Accepted Answer

The answer of What will happen if reverse() and join()...

Question 6

The pop() method of the array does which of the following task ?
A)decrements the total length by 1
B)increments the total length by 1
C)prints the first element but no effect on the length
D)None of the above

Accepted Answer

The pop() method removes the last element from an array and returns that element. This method changes the length of the array by decrementing it by one.

Question 7

The '$' present in the RegExp object is called a
A)character
B)matcher
C)metacharacter
D)metadata

Accepted Answer

The '$' symbol in RegExp (Regular Expressions) is a metacharacter that matches the end of a line or string.

Question 8

The regular expression to match any one character not between the brackets is
A)[...]
B)[^]
C)[^...]
D)[\D]

Accepted Answer

The correct regular expression to match any one character not specified in the brackets is C) [^...], where "^" inside the brackets negates the character set defined within the brackets.

Question 9

The type that specifies what kind of event occured is
A)event type
B)even target
C)Both a and b
D)None of the above

Accepted Answer

The term "event type" specifically refers to the kind of event that occurred, such as a click, mouseover, or keypress event. It describes the nature of the event without referring to where or on what the event occurred.

Question 10

Which is the object on which the event occured or with which the event is associated?
A)event type
B)event target
C)Both a and b
D)None of the above

Accepted Answer

The event target is the object on which the event occurred or with which the event is associated, not the event type.

Question 11

In general, event handler is nothing but
A)function
B)interface
C)event
D)handler

Accepted Answer

Event handlers are functions that are called in response to a specific event occurring.

Question 12

When will the browser invoke the handler?
A)Program begins
B)Any event occurs
C)Specified event occurs
D)None of the above

Accepted Answer

The browser will invoke the event handler when the specified event occurs. This is because event handlers are designed to respond to specific events, such as clicks, mouse movements, key presses, etc., that are explicitly defined in the code.

Question 13

Which are the events that have default actions that can be canceled by event handlers?
A)Submit and form-related events
B)Reset and form-related events
C)Submit and reset events
D)None of the mentioned

Accepted Answer

Submit and reset events are examples of events that have default actions which can be canceled by event handlers. For instance, preventing a form from submitting or resetting can be achieved by calling `preventDefault()` on the event object within the event handler.

Question 14

The events that represents occurrences related to the browser window are
A)Window
B)Element
C)Display
D)Handlers

Accepted Answer

Window events are specifically related to the browser window, such as loading, resizing, or scrolling the window. These events do not pertain to individual elements within the page, but rather to the window object itself.

Question 15

Which event is fired when a document and all of its external resources are fully loaded and displayed to the user?
A)Window
B)Load
C)Element
D)Handler

Accepted Answer

The "load" event is fired when the whole page has loaded, including all dependent resources such as stylesheets and images.

Question 16

Which is the opposite to the load event in JavaScript?
A)dontload
B)postload
C)preload
D)unload

Accepted Answer

The opposite of the load event in JavaScript is the unload event. The unload event is fired when the document or a child resource is being unloaded.

Question 17

When are the mouse events generated?
A)When user clicks the mouse over a document
B)When user moves the mouse over a document
C)Both a and b
D)None of the above

Accepted Answer

Mouse events are generated both when a user clicks the mouse over a document and when the user moves the mouse over a document.

Question 18

When is the mouseover event fired?
A)When mouse is moved over a new element
B)When mouse is clicked
C)When mouse is both moved and clicked
D)None of the above

Accepted Answer

The mouseover event is fired when the mouse is moved over a new element, triggering actions or responses in the interface.

Question 19

The focus and blur events are also part of
A)Element events
B)Handler events
C)Window events
D)Scroll events

Accepted Answer

The answer of The focus and blur events are also...

Question 20

Which syntax is used to describe elements in CSS?
A)Protectors
B)Selectors
C)Both a and b
D)None of the above

Accepted Answer

Selectors are used in CSS to target HTML elements and apply styles to them.

Quiz 16: Javascript and Event Handling: Understanding Expressions, Methods, and Events

JavaScript is a _______________ language

A conditional expression is also called a

The "var" and "function" are

The method or operator used to identify the array is

What will happen if reverse() and join() methods are used simultaneously ?

The pop() method of the array does which of the following task ?

The '$' present in the RegExp object is called a

The regular expression to match any one character not between the brackets is

The type that specifies what kind of event occured is

Which is the object on which the event occured or with which the event is associated?

In general, event handler is nothing but

When will the browser invoke the handler?

Which are the events that have default actions that can be canceled by event handlers?

The events that represents occurrences related to the browser window are

Which event is fired when a document and all of its external resources are fully loaded and displayed to the user?

Which is the opposite to the load event in JavaScript?

When are the mouse events generated?

When is the mouseover event fired?

The focus and blur events are also part of

Which syntax is used to describe elements in CSS?