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JavaScript Questions & Answers – Defining and Invoking Functions | JavaScript MCQs

Questions
1 The function definitions in JavaScript begins with _____________
A Identifier and Parentheses
B Return type and Identifier
C Return type, Function keyword, Identifier and Parentheses
D Identifier and Return type

Answer: Return type, Function keyword, Identifier and Parentheses
2 What will be the output of the following JavaScript code?
function printprops(o)
	{
    for(var p in o)
     	console.log(p + ": " + o[p] + "\n");
	}
A Prints the contents of each property of o
B Returns undefined
C Prints only one property
D Prints the address of elements

Answer: Returns undefined
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3 When does the function name become optional in JavaScript?
A When the function is defined as a looping statement
B When the function is defined as expressions
C When the function is predefined
D when the function is called

Answer: When the function is defined as expressions
4 What is the purpose of a return statement in a function?
A Returns the value and continues executing rest of the statements, if any
B Returns the value and stops the program
C Returns the value and stops executing the function
D Stops executing the function and returns the value

Answer: Stops executing the function and returns the value
5 What will happen if a return statement does not have an associated expression?
A It returns the value 0
B It will throw an exception
C It returns the undefined value
D It will throw an error

Answer: It returns the undefined value
6 A function with no return value is called ___________
A Procedures
B Method
C Static function
D Dynamic function

Answer: Procedures
7 The function stops its execution when it encounters?
A continue statement
B break statement
C goto statement
D return statement

Answer: return statement
8 Which keyword is used to define the function in javascript?
A void
B int
C function
D main

Answer: function
9 Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?
A o(x,y);
B o.m(x) && o.m(y);
C m(x,y);
D o.m(x,y);

Answer: o.m(x,y);
10 What will be the equivalent code of the following JavaScript code?

o.m(x,y);

A o.m(x) && o.m(y);
B o[“m”](x,y);
C o(m)[“x”,”y”];
D o.m(x && y);

Answer: o[“m”](x,y);
11 What will be the output of the following JavaScript code?
function info()
	{ 
    int a=1;
   int b=2;
    return a*b;
	}  
document.write(info());
A 1
B 2
C 3
D error

Answer: 2
12 What will be the output of the following JavaScript code?
var arr = [7, 5, 9, 1]; 
var value = Math.max.apply(null, arr);
document.writeln(value);
A 7
B 5
C 1
D 9

Answer: 9
13 What will be the output of the following JavaScript code?
var person =
{ 
      name: “Rahul”,
      getName: function()
      {  
         nreturn this.name; 
      }  
}
var unboundName = person.getName;  
var boundName = unboundName.bind(person);
document.writeln(boundName());
A runtime error;
B compilation error
C Rahul
D undefined

Answer: Rahul
14 What will be the output of the following JavaScript code?
function code(id,name)
{
  		this.id = id;
  		this.name = name;
}
function pcode(id,name)
{
 		code.call(this,id,name);
}
document.writeln(new pcode(101,"vivek").id);
A vivek
B 101
C Runtime error
D Compilation error

Answer: 101
15 What will be the output of the following JavaScript code?
var pow=new Function("num1","num2","return Math.pow(num1,num2)");
     document.writeln(pow(2,3));
A 2
B 3
C 8
D error

Answer: 8

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