JavaScript Questions & Answers – Statements | JavaScript MCQs

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

Answer: Object-Based
2 What will be the output of the following JavaScript code?
var a=5 , b=1
var obj = { a : 10 }
with(obj) 
{
      alert(b)
}
A 10
B Error
C 1
D 5

Answer: 1
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3 A conditional expression is also called a _______________
A Alternative to if-else
B Immediate if
C If-then-else statement
D Switch statement

Answer: Immediate if
4 Which is a more efficient JavaScript code snippet?
Code 1 :

for(var num=10;num>=1;num--) {

document.writeln(num); }

Code 2 :

var num=10; while(num>=1) { document.writeln(num); num++; }
A Code 1
B Code 2
C Both Code 1 and Code 2
D Cannot Compare

Answer: Code 1
5 What is a block statement in JavaScript?
A conditional block
B block that contains a single statement
C both conditional block and a single statement
D block that combines multiple statements into a single compound statement

Answer: block that combines multiple statements into a single compound statement
6 When an empty statement is encountered, a JavaScript interpreter __________
A Ignores the statement
B Prompts to complete the statement
C Throws an error
D Shows a warning

Answer: Ignores the statement
7 The “var” and “function” are __________
A Keywords
B Declaration statements
C Data types
D Prototypes

Answer: Declaration statements
8

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

switch(expression)
{
    statements
}
A ==
B equals
C equal
D ===

Answer: ===
9 What happens in the following javaScript code snippet?
var count = 0;
while (count < 10) 
{
    console.log(count);
    count++;
}
A The values of count are 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: The value of count from 0 to 9 is displayed in the console
10 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: If the object inherits enumerable properties
11 What will be the output of the following JavaScript code?
Int a=1;
if(a>10)
{  
    document.write(10); 
}
else
{
    document.write(a);
}
A 10
B 0
C 1
D Undefined

Answer: 1
12 What will be the output of the following JavaScript code?
var grade='B'; 
var result; 
switch(grade)
{ 
   case 'A':
    {  
        result+="10";
        break;
    } 
   case 'B':>
    {  
        result+=" 9";
        break;
   }  
    case 'C':
   { 
        result+=" 8";
        break;
        }  
    default:  
    result+=" 0";  
}  
document.write(result);
A 10
B 9
C 8
D 0

Answer: 9
13 What will be the output of the following JavaScript code?
var grade='A'; 
var result;
switch(grade)
	{  
   case 'A': 
        result+="10";  
    	case 'B': 
        result+=" 9"; 
   	case 'C': 
       	result+=" 8"; 
    	default:
        result+=" 0"; 
}  
document.write(result);
A 10
B 27
C 8
D 0

Answer: 27
14 What will be the output of the following JavaScript code?
int a=4;
int b=1;
int c=0;
If(a==b)
    	document.write(a);
	else if(a==c)
    	document.write(a);
else
    	document.write(c);
A 4
B 1
C Error
D 0

Answer: 0
15 What will be the output of the following JavaScript code?
var grade='E';
var result;  
switch(grade)
{  
    case 'A':  
       result+="10";
    	case 'B':  
        result+=" 9";  
    case 'C':  
        result+=" 8";
    default: 
        result+=" 0";
} 
document.write(result);
A 10
B 0
C 18
D 17

Answer: 0

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