Blockchain JavaScript Developer set 2

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Free Online Best Blockchain JavaScript Developer MCQ Questions for improve your basic knowledge of Blockchain JavaScript. This Blockchain JavaScript Developer set 2 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

What will be the output of the following JavaScript code? var string 1 = ”123”; var intvalue = 123; alert( string1 + intvalue );

A	123246
B	246
C	123123
D	Exception

Question 2

In JavaScript the x===y statement implies that:

A	Both x and y are equal in value, type and reference address as well.
B	Both are x and y are equal in value only.
C	Both are equal in the value and data type.
D	Both are not same at all.

Question 3

A hexadecimal literal begins with __________

A	0
B	0x
C	0X
D	Both 0x and 0X

Question 4

The "function" and " var" are known as:

A	Keywords
B	Data types
C	Declaration statements
D	Prototypes

Question 5

Which of the following variables takes precedence over the others if the names are the same?

A	Global variable
B	The local element
C	The two of the above
D	None of the above

Question 6

The type of a variable that is volatile is _______________

A	Volatile variable
B	Mutable variable
C	Immutable variable
D	Dynamic variable

Question 7

When interpreter encounters an empty statements, what will it do?

A	It will Shows a warning
B	It will Prompts to complete the statement
C	It will Throws an error
D	It will Ignores the statements

Question 8

The web development environment (JavaScript) offers which standard construct for data validation of the input entered by the user?

A	Controlled loop constructs
B	Server page access
C	Client side Event
D	Permit server-side

Question 9

Javascript is a ______________ type of language.

A	Object-Oriented
B	Object-Based
C	Assembly-language
D	High-level

Question 10

JavaScript Code can be called by using ___________

A	RMI
B	Triggering Event
C	Preprocessor
D	Function/Method

Question 11

In JavaScript, what is a block of statements?

A	is a Conditional block
B	is combines a number of statements into a single compound statement
C	is a conditional block and a single statement
D	is a block that contains a single statement

Question 12

When there is an indefinite or an infinite value during an arithmetic computation in a program, then JavaScript prints______.

A	Prints an exception error
B	Prints an overflow error
C	Displays "Infinity"
D	Prints the value as such

Question 13

In JavaScript, what will be used for calling the function definition expression:

A	Function prototype
B	Function literal
C	Function calling
D	Function declaration

Question 14

Which of the following is correct about features of JavaScript?

A	JavaScript is complementary to and integrated with HTML.
B	JavaScript is open and cross-platform.
C	Both of the above
D	All of the above

Question 15

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

A	Primary Expression
B	Object Creation Expression
C	Invocation Expression
D	Constructor Calling Expression

Question 16

Choose the correct snippet from the following to check if the variable "a" is not equal the "NULL":

A	if(a!==null)
B	if (a!)
C	if(a!null)
D	if(a!=null)

Question 17

When interpreter encounters an empty statements, what will it do?

A	Shows a warning
B	Prompts to complete the statement
C	Throws an error
D	Ignores the statements

Question 18

Which of the following functions of the String object returns the character in the string starting at the specified position via the specified number of characters?

A	slice()
B	split()
C	substr()
D	search()

Question 19

In the JavaScript, which one of the following is not considered as an error?

A	Syntax error
B	Missing of semicolons
C	Division by zero
D	Missing of Bracket

Question 20

The "new Point(3,2)", is a kind of _______ expression

A	Object Creation Expression
B	Primary Expression
C	Invocation Expression
D	Constructor Calling Expression

Question 21

Which of the following number object functions returns the value of the number?

A	toString()
B	valueOf()
C	toLocaleString()
D	toPrecision()

Question 22

A function definition expression can be called as __________

A	Function prototype
B	Function literal
C	Function calling
D	Function declaration

Question 23

Which of the following type of variable is visible everywhere in your JavaScript code?

A	global variable
B	local variable
C	Both of the above
D	None of the above

Question 24

Which of the following given functions of the Number Object formats a number with a different number of digits to the right of the decimal?

A	toExponential()
B	toFixed()
C	toPrecision()
D	toLocaleString()

Question 25

Which one of the following also known as Conditional Expression?

A	Alternative to if-else
B	Switch statement
C	If-then-else statement
D	immediate if

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Blockchain JavaScript Developer set 2

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