Consider the following code snippetfunction tail(o){for (; o.next; o = o.next) ;return o;}Will the above code snippet work? If not, what will be the error?

o, this will result in a runtime error with the message “Cannot use Linked List”

o, this will throw an exception as only numerics can be used in a for loop

o, this will result in a runtime error with the message “Cannot use Linked List”

Consider the following code snippetfunction printArray(a){var len = a.length, i = 0;if (len == 0)console.log("Empty Array");else{do{console.log(a[i]);} while (++i < len);}}What does the above code result?

rints the numbers in the array in the reverse order

rints the numbers in the array in order

rints the numbers in the array in the reverse order

rints 0 to the length of the array

Consider the following statementsvar count = 0;while (count < 10){.log(count);count++;}In the above code snippet, what happens?

he values of count is logged or stored in a particular location or storage

he value of count from 0 to 9 is displayed in the console

Consider the following code snippetfunction f(o){if (o === undefined) debugger;}What could be the task of the statement debugger?

t debugs the error in that statement and restarts the statement’s execution

t does nothing but a simple breakpoint

t debugs the error in that statement and restarts the statement’s execution

t is used as a keyword that debugs the entire program at once

Consider the following code snippetwhile (a != 0){if (spam>a == 1)continue;else++;}What will be the role of the continue keyword in the above code snippet?

he continue keyword restarts the loop

he continue keyword skips the next iteration

he continue keyword skips the rest of the statements in that iteration

A statement block is a

block that contains a single statement

Both conditional block and single statement

block that combines multiple statements into a single compound statement

Consider the following statements var count = 0; while (count < 10) { console.log(count); count++; } In the above code snippet, what happens?

The values of count is logged or stored in a particular location or storage

The value of count from 0 to 9 is displayed in the console

The enumeration order becomes implementation dependent and non-interoperable if :

The object does not have the properties present in the integer array indices

If the object inherits enumerable properties

The object does not have the properties present in the integer array indices

The delete keyword is never used

Object.defineProperty() is not used

Consider the following code snippet function printArray(a) { var len = a.length, i = 0; if (len == 0) console.log("Empty Array"); else { do { console.log(a[i]); } while (++i < len); } }What does the above code result?

Prints the numbers in the array in the reverse order

Prints the numbers in the array in order

Prints the numbers in the array in the reverse order

Prints 0 to the length of the array

Consider the following code snippet function tail(o){ for (; o.next; o = o.next) ; return o; }Will the above code snippet work? If not, what will be the error?

No, this will result in a runtime error with the message “Cannot use Linked List”

No, this will throw an exception as only numerics can be used in a for loop

No, this will result in a runtime error with the message “Cannot use Linked List”

One of the special feature of an interpreter in reference with the for loop is that

The iterations can be infinite when an interpreter is used

Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property

The iterations can be infinite when an interpreter is used

The body of the loop is executed only once

What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?

The property will be stored in a cache

That property will not be enumerated

Consider the following code snippet while (a != 0) { if (a == 1) continue; else a++; } What will be the role of the continue keyword in the above code snippet?

The continue keyword restarts the loop

The continue keyword skips the next iteration

The continue keyword skips the rest of the statements in that iteration

JavaScript is also called as _____________.

Browser Side Scripting Language

Why JavaScript is called as Lightweight Programming Language ?

because JS is available free of cost

because JS is client side scripting

because we can add programming functionality inside JS

because JS can provide programming functionality inside but up to certain extend.

JavaScript is designed for following purpose -

To Perform Server Side Scripting Opertion

To add interactivity to HTML Pages.

To Perform Server Side Scripting Opertion

To Execute Query Related to DB on Server

What would be the output of the following fraction of code ? int Integer = 34 ; char String = 'S' ; System.out.print( Integer ) ; System.out.print( String ) ;

Does not compile as Integer and String are API class names.

The following fraction of code double STATIC = 2.5 ; System.out.println( STATIC );

Rraises an error as STATIC is used as a variable which is a keyword

A proper scripting language is a

Assembly level programming language

High level programming language

Assembly level programming language

Machine level programming language

What is the purpose of the file_get_contents()?

To get the errors and exceptions

What will happen if you set the private flag as 1?

Test will be run only by the administrator

Test is not displayed in public

302 + Mcqs in Basic And Variables in Javascript Page 1 McqOptions

1.	Consider the following code snippetfunction tail(o){for (; o.next; o = o.next) ;return o;}Will the above code snippet work? If not, what will be the error?
A.	o, this will throw an exception as only numerics can be used in a for loop
B.	o, this will not iterate
C.	es, this will work
D.	o, this will result in a runtime error with the message “Cannot use Linked List”
Answer» D. o, this will result in a runtime error with the message “Cannot use Linked List”

Discussion

2.	Consider the following code snippetfunction printArray(a){var len = a.length, i = 0;if (len == 0)console.log("Empty Array");else{do{console.log(a[i]);} while (++i < len);}}What does the above code result?
A.	rints the numbers in the array in order
B.	rints the numbers in the array in the reverse order
C.	rints 0 to the length of the array
D.	rints “Empty Array”
Answer» B. rints the numbers in the array in the reverse order

Discussion

3.	Consider the following statementsvar count = 0;while (count < 10){.log(count);count++;}In the above code snippet, what happens?
A.	he values of count is logged or stored in a particular location or storage
B.	he value of count from 0 to 9 is displayed in the console
C.	n error is displayed
D.	n exception is thrown
Answer» C. n error is displayed

Discussion

4.	“An expression that can legally appear on the left side of an assignment expression.” is a well known explanation for variables, properties of objects, and elements of arrays. They are called
A.	roperties
B.	rototypes
C.	value
D.	efinition
Answer» D. efinition

Discussion

5.	Which is a more efficient code snippet ?Code 1 :for(var=10;num>=1;num--){document.writeln(num);}Code 2 :var num=10;while(num>=1){document.writeln(num);num++;}
A.	ode 1
B.	ode 2
C.	oth Code 1 and Code 2
D.	annot Compare
Answer» B. ode 2

Discussion

6.	Consider the following statementsvar text = "testing: 1, 2, 3"; // Sample textvar pattern = /d+/g // Matches all instances of one or more digitsIn order to check if the pattern matches with the string “text”, the statement is
A.	ext==pattern
B.	ext.equals(pattern)
C.	ext.test(pattern)
D.	attern.test(text)
Answer» E.

Discussion

7.	Consider the following snippet codevar string1 = ”123”;var intvalue = 123;alert( string1 + intvalue )The result would be
A.	23246
B.	46
C.	23123
D.	xception
Answer» D. xception

Discussion

8.	Identify the process done in the below code snippeto = {x:1, y:{z:[false,null,"]}};s = JSON.(o);p = JSON.parse(s);
A.	bject Encapsulation
B.	bject Serialization
C.	bject Abstraction
D.	bject Encoding
Answer» C. bject Abstraction

Discussion

9.	Consider the below given syntaxbook[datatype]=assignment_value;In the above syntax, the datatype within the square brackets must be
A.	n integer
B.	String
C.	n object
D.	one of the mentioned
Answer» C. n object

Discussion

10.	Consider the following code snippet :var book = {"main title": "JavaScript",'sub-title': "The Definitive Guide","for": "all audiences",author: {firstname: "David",surname: "Flanagan"}};In the above snippet, firstname and surname are
A.	roperties
B.	roperty values
C.	roperty names
D.	bjects
Answer» D. bjects

Discussion

11.	Consider the following code snippetfunction f(o){if (o === undefined) debugger;}What could be the task of the statement debugger?
A.	t does nothing but a simple breakpoint
B.	t debugs the error in that statement and restarts the statement’s execution
C.	t is used as a keyword that debugs the entire program at once
D.	ll of the mentioned
Answer» B. t debugs the error in that statement and restarts the statement’s execution

Discussion

12.	Consider the following code snippetwhile (a != 0){if (spam>a == 1)continue;else++;}What will be the role of the continue keyword in the above code snippet?
A.	he continue keyword restarts the loop
B.	he continue keyword skips the next iteration
C.	he continue keyword skips the rest of the statements in that iteration
D.	one of the mentioned
Answer» D. one of the mentioned

Discussion

13.	Among the following, which one is a ternary operator?
A.	+
B.	:
C.	–
D.	?:
Answer» E.

Discussion

14.	What kind of an expression is “new Point(2,3)”?
A.	Primary Expression
B.	Object Creation Expression
C.	Invocation Expression
D.	Constructor Calling Expression
Answer» C. Invocation Expression

Discussion

15.	JavaScript is a _______________ language
A.	Object-Oriented
B.	High-level
C.	Assembly-language
D.	Object-Based
Answer» E.

Discussion

16.	A conditional expression is also called a
A.	Alternate to if-else
B.	Immediate if
C.	If-then-else statement
D.	None of the mentioned
Answer» C. If-then-else statement

Discussion

17.	A statement block is a
A.	conditional block
B.	block that contains a single statement
C.	Both conditional block and single statement
D.	block that combines multiple statements into a single compound statement
Answer» E.

Discussion

18.	The “var” and “function” are
A.	Keywords
B.	Declaration statements
C.	Datatypes
D.	Prototypes
Answer» C. Datatypes

Discussion

19.	Consider the following statements switch(expression) { statements } In the above switch syntax, the expression is compared with the case labels using which of the following operator(s) ?
A.
B.	equals
C.	equal
D.
Answer» E.

Discussion

20.	Consider the following statements var count = 0; while (count < 10) { console.log(count); count++; } In the above code snippet, what happens?
A.	The values of count is logged or stored in a particular location or storage
B.	The value of count from 0 to 9 is displayed in the console
C.	An error is displayed
D.	An exception is thrown
Answer» C. An error is displayed

Discussion

21.	The enumeration order becomes implementation dependent and non-interoperable if :
A.	If the object inherits enumerable properties
B.	The object does not have the properties present in the integer array indices
C.	The delete keyword is never used
D.	Object.defineProperty() is not used
Answer» B. The object does not have the properties present in the integer array indices

Discussion

22.	Consider the following code snippet function printArray(a) { var len = a.length, i = 0; if (len == 0) console.log("Empty Array"); else { do { console.log(a[i]); } while (++i < len); } }What does the above code result?
A.	Prints the numbers in the array in order
B.	Prints the numbers in the array in the reverse order
C.	Prints 0 to the length of the array
D.	Prints “Empty Array”
Answer» B. Prints the numbers in the array in the reverse order

Discussion

23.	Consider the following code snippet function tail(o){ for (; o.next; o = o.next) ; return o; }Will the above code snippet work? If not, what will be the error?
A.	No, this will throw an exception as only numerics can be used in a for loop
B.	No, this will not iterate
C.	Yes, this will work
D.	No, this will result in a runtime error with the message “Cannot use Linked List”
Answer» D. No, this will result in a runtime error with the message “Cannot use Linked List”

Discussion

24.	One of the special feature of an interpreter in reference with the for loop is that
A.	Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property
B.	The iterations can be infinite when an interpreter is used
C.	The body of the loop is executed only once
D.	All of the mentioned
Answer» B. The iterations can be infinite when an interpreter is used

Discussion

25.	What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?
A.	The property will be stored in a cache
B.	The loop will not run
C.	That property will not be enumerated
D.	All of the mentioned
Answer» D. All of the mentioned

Discussion

26.	Consider the following code snippet while (a != 0) { if (a == 1) continue; else a++; } What will be the role of the continue keyword in the above code snippet?
A.	The continue keyword restarts the loop
B.	The continue keyword skips the next iteration
C.	The continue keyword skips the rest of the statements in that iteration
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

27.	Local Browser used for validations on the Web Pages uses __________.
A.	Java
B.	HTML
C.	CSS
D.	JS
Answer» E.

Discussion

28.	JavaScript is also called as _____________.
A.	Server Side Scripting Language
B.	Browser Side Scripting Language
C.	Client Side Scripting Language
D.	Both B and C
Answer» E.

Discussion

29.	Why JavaScript is called as Lightweight Programming Language ?
A.	because JS is available free of cost
B.	because JS is client side scripting
C.	because we can add programming functionality inside JS
D.	because JS can provide programming functionality inside but up to certain extend.
Answer» E.

Discussion

30.	JavaScript Code is written inside file having extension __________.
A.	.jvs
B.	.javascript
C.	.js
D.	.jsc
Answer» D. .jsc

Discussion

31.	Cost for Using JavaScript in your HTML is _________ .
A.	Its Free !!!
B.	$10 / Year
C.	$15 / Year
D.	$5 / Year
Answer» B. $10 / Year

Discussion

32.	JavaScript is designed for following purpose -
A.	To Style HTML Pages
B.	To add interactivity to HTML Pages.
C.	To Perform Server Side Scripting Opertion
D.	To Execute Query Related to DB on Server
Answer» C. To Perform Server Side Scripting Opertion

Discussion

33.	Javascript is _________ language.
A.	Programming
B.	Application
C.	None of These
D.	Scripting
Answer» E.

Discussion

34.	What would be the output of the following fraction of code ? int Integer = 34 ; char String = 'S' ; System.out.print( Integer ) ; System.out.print( String ) ;
A.	Does not compile as Integer and String are API class names.
B.	34
C.	S
D.	34 S
Answer» E.

Discussion

35.	What will be output of the following program code? public class Test{ public static void main(String[] a) { short x = 10; x = x*5; System.out.print(x); } }
A.	50
B.	10
C.	Compilation Error
D.	None of these
Answer» D. None of these

Discussion

36.	The following fraction of code double STATIC = 2.5 ; System.out.println( STATIC );
A.	Prints 2.5
B.	Rraises an error as STATIC is used as a variable which is a keyword
C.	Raises an exception
D.	None of these
Answer» B. Rraises an error as STATIC is used as a variable which is a keyword

Discussion

37.	A proper scripting language is a
A.	High level programming language
B.	Assembly level programming language
C.	Machine level programming language
D.	Low level programming language
Answer» B. Assembly level programming language

Discussion

38.	Which environment variable must the user enable in order to enable data tainting?
A.	ENABLE_TAINT
B.	MS_ENABLE_TAINT
C.	NS_ENABLE_TAINT
D.	ENABLE_TAINT_NS
Answer» D. ENABLE_TAINT_NS

Discussion

39.	Which tag can handle mouse events in Netscape?
A.	img
B.	a
C.	br
D.	none of the mentioned
Answer» B. a

Discussion

40.	What will the file_get_contents() return?
A.	Server’s response
B.	Errors
C.	Exception
D.	Client’s response
Answer» B. Errors

Discussion

41.	What is the purpose of the file_get_contents()?
A.	To get the errors and exceptions
B.	To get the client’s response
C.	To get the server’s response
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

42.	What is the purpose of getting the paramerer fvonly?
A.	To repeat the view test
B.	To get the first view
C.	To debug the code
D.	None of the mentioned
Answer» C. To debug the code

Discussion

43.	What will happen if you set the private flag as 1?
A.	Test will be run only by the administrator
B.	Test will not be run
C.	Test is public
D.	Test is not displayed in public
Answer» E.

Discussion

44.	What is the purpose of the method par()?
A.	Makes the text vertical
B.	Makes the text horizontal
C.	Makes the text diagonal
D.	None of the mentioned
Answer» C. Makes the text diagonal

Discussion

45.	What is the purpose of the method symbols in R?
A.	Draw symbols
B.	Draw other shapes
C.	Draw symbols and other shapes
D.	None of the mentioned
Answer» C. Draw symbols and other shapes

Discussion

46.	What is the purpose of the method plot()?
A.	Displays symbols
B.	Displays charts
C.	Displays symbols and charts
D.	None of the mentioned
Answer» C. Displays symbols and charts

Discussion

47.	Which function is used to create data frames?
A.	data.frames()
B.	frame.data()
C.	data.frame()
D.	frame(data)
Answer» D. frame(data)

Discussion

48.	Which of the following list contains multiple data types?
A.	Vectors
B.	Data frames
C.	Matrices
D.	None of the mentioned
Answer» C. Matrices

Discussion

49.	Which is the function used to add the vectors?
A.	c()
B.	add(vectors)
C.	c(vectors)
D.	vectors.add
Answer» B. add(vectors)

Discussion

50.	Which of the following is the assignment operator?
A.	<-
B.	->
C.	=
D.
Answer» B. ->

Discussion

Explore topic-wise MCQs in Javascript.

Consider the following code snippetfunction tail(o){for (; o.next; o = o.next) ;return o;}Will the above code snippet work? If not, what will be the error?

Consider the following code snippetfunction printArray(a){var len = a.length, i = 0;if (len == 0)console.log("Empty Array");else{do{console.log(a[i]);} while (++i < len);}}What does the above code result?

Consider the following statementsvar count = 0;while (count < 10){.log(count);count++;}In the above code snippet, what happens?

“An expression that can legally appear on the left side of an assignment expression.” is a well known explanation for variables, properties of objects, and elements of arrays. They are called

Which is a more efficient code snippet ?Code 1 :for(var=10;num>=1;num--){document.writeln(num);}Code 2 :var num=10;while(num>=1){document.writeln(num);num++;}

Consider the following statementsvar text = "testing: 1, 2, 3"; // Sample textvar pattern = /d+/g // Matches all instances of one or more digitsIn order to check if the pattern matches with the string “text”, the statement is

Consider the following snippet codevar string1 = ”123”;var intvalue = 123;alert( string1 + intvalue )The result would be

Identify the process done in the below code snippeto = {x:1, y:{z:[false,null,"]}};s = JSON.(o);p = JSON.parse(s);

Consider the below given syntaxbook[datatype]=assignment_value;In the above syntax, the datatype within the square brackets must be

Consider the following code snippet :var book = {"main title": "JavaScript",'sub-title': "The Definitive Guide","for": "all audiences",author: {firstname: "David",surname: "Flanagan"}};In the above snippet, firstname and surname are

Consider the following code snippetfunction f(o){if (o === undefined) debugger;}What could be the task of the statement debugger?

Consider the following code snippetwhile (a != 0){if (spam>a == 1)continue;else++;}What will be the role of the continue keyword in the above code snippet?

Among the following, which one is a ternary operator?

What kind of an expression is “new Point(2,3)”?

JavaScript is a _______________ language

A conditional expression is also called a

A statement block is a

The “var” and “function” are

Consider the following statements switch(expression) { statements } In the above switch syntax, the expression is compared with the case labels using which of the following operator(s) ?

Consider the following statements var count = 0; while (count < 10) { console.log(count); count++; } In the above code snippet, what happens?

The enumeration order becomes implementation dependent and non-interoperable if :

Consider the following code snippet function printArray(a) { var len = a.length, i = 0; if (len == 0) console.log("Empty Array"); else { do { console.log(a[i]); } while (++i < len); } }What does the above code result?

Consider the following code snippet function tail(o){ for (; o.next; o = o.next) ; return o; }Will the above code snippet work? If not, what will be the error?

One of the special feature of an interpreter in reference with the for loop is that

What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?

Consider the following code snippet while (a != 0) { if (a == 1) continue; else a++; } What will be the role of the continue keyword in the above code snippet?

Local Browser used for validations on the Web Pages uses __________.

JavaScript is also called as _____________.

Why JavaScript is called as Lightweight Programming Language ?

JavaScript Code is written inside file having extension __________.

Cost for Using JavaScript in your HTML is _________ .

JavaScript is designed for following purpose -

Javascript is _________ language.

What would be the output of the following fraction of code ? int Integer = 34 ; char String = 'S' ; System.out.print( Integer ) ; System.out.print( String ) ;

What will be output of the following program code? public class Test{ public static void main(String[] a) { short x = 10; x = x*5; System.out.print(x); } }

The following fraction of code double STATIC = 2.5 ; System.out.println( STATIC );

A proper scripting language is a

Which environment variable must the user enable in order to enable data tainting?

Which tag can handle mouse events in Netscape?

What will the file_get_contents() return?

What is the purpose of the file_get_contents()?

What is the purpose of getting the paramerer fvonly?

What will happen if you set the private flag as 1?

What is the purpose of the method par()?

What is the purpose of the method symbols in R?

What is the purpose of the method plot()?

Which function is used to create data frames?

Which of the following list contains multiple data types?

Which is the function used to add the vectors?

Which of the following is the assignment operator?