Javascript Multiple Choice Questions and Answers Defining and Invoking Functions

(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

(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

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

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