JavaScript Trivia Exam: Quiz!
- 1.Do functions in JavaScript necessarily return a value?
- A.
It is mandatory
- B.
Not necessary
- C.
Few functions return values by default
- D.
All of the choices
- 2.Which of the following is an example of a javascript function?
- A.
Alert()
- B.
If()
- C.
Script()
- D.
None of the choices
- 3.It is a group of reusable code which can be called anywhere in your program.
- A.
Events
- B.
Functions
- C.
Actions
- D.
Objects
- 4.Consider the following code snippet :var tensquared = (function(x) {return x*x;}(10));Will the given code work ?
- A.
Yes, perfectly
- B.
Error
- C.
Exception will be thrown
- D.
Memory leak
- 5.Consider the following code snippet
- A.
123
- B.
123xyz
- C.
Exception
- D.
NaN
- 6.For the below mentioned code snippet:var o = new Object();The equivalent statement is
- A.
Var o = Object();
- B.
Var o;
- C.
Var o= new Object;
- D.
Object o=new Object();
- 7.The most common way to definea function in JavaScript is by using the________ keyword,
- A.
Event
- B.
Func
- C.
Function
- D.
Script
- 8.What is the output of the following snippet: <html><head><script type="text/javascript">function sayHello(){document.write ("Hello there!");}</script></head><body><p>Click the following button to call the function</p><form><input type="button" onclick="sayHello()" value="Say Hello"></form><p>Use different text in write method and then try...</p></body></html>
- A.
When the button is clicked an output sayHell will be displayed Option 1
- B.
When the button is clicked an output "Hello" will be displayed
- C.
When the button is clicked an output "Button" will be displayed
- D.
When the button is clicked an output "Hello there!" will be displayed
- 9.Which of the following statement about the function is true?
- A.
Functions would not eliminates the need of writing the same code again and again
- B.
A function can take multiple parameters separated by comma.
- C.
It will not allow a programmer to divide a big program into a number of small and manageable functions
- D.
The parameter list of the function should be empty
- 10.The follwing syntax is used to?<script type="text/javascript"><!--var variablename = new Function(Arg1, Arg2..., "Function Body");//--></script>
- A.
To create a function using Function() constructor
- B.
To implement nested functions.
- C.
To implement function literal
- D.
None of the choices
- 11.Consider the following code snippet :function constfuncs() { var funcs = []; for(var i = 0; i < 10; i++) funcs[i] = function() { return i; }; return funcs; } var funcs = constfuncs(); funcs[5]() What does the last statement return ?
- A.
9
- B.
0
- C.
10
- D.
None of the choices
- 12.The behaviour of the instances present of a class inside a method is defined by
- A.
Method
- B.
Classes
- C.
Interfaces
- D.
Classes and Interfaces
- 13.The keyword or the property that you use to refer to an object through which they were invoked is
- A.
From
- B.
To
- C.
This
- D.
Object
- 14.JavaScript's interaction with HTML is handled through ___ that occur whenthe user or the browser manipulates a page.
- A.
Function
- B.
Class
- C.
Object
- D.
Event
- 15.This is the most frequently used event type which occurs when a user clicks theleft button of his mouse
- A.
OnSubmit
- B.
Onmouseover
- C.
OnClick
- D.
All of the given
- 16.It is is an important keyword in JavaScript which can be used as a unaryoperator that appears before its single operand, which may be of any type.
- A.
Return
- B.
Void
- C.
Function
- D.
Script
- 17.It is the capability to store related information, whether dataor methods, together in an object.
- A.
Encapsulation
- B.
Aggregation
- C.
Inheritance
- D.
Polymorphism
- 18.It is the capability to store one object inside another object.
- A.
Polymorphism
- B.
Encapsulation
- C.
Inheritance
- D.
Aggregation
- 19.It is the capability to write one function or method that worksin a variety of different ways.
- A.
Polymorphism
- B.
Encapsulation
- C.
Inheritance
- D.
Aggregation
- 20.It is the capability of a class to rely upon another class (ornumber of classes) for some of its properties and methods.
- A.
Encapsulation
- B.
Inheritance
- C.
Aggregation
- D.
Polymorphism
- 21.The syntax for adding a property to an object is:
- A.
ObjectName.objectProperty = new propertyValue();
- B.
ObjectName.objectProperty = new propertyValue;
- C.
ObjectName.objectProperty = propertyValue;
- D.
ObjectName.objectProperty = propertyValue();
- 22.Which of the following is an example to show how to use thewrite() method of document object to write any content on the document
- A.
Alert ("This is test");
- B.
Document.write ("Hello world");
- C.
Document.write (This is test);
- D.
None of the given
- 23.The____ operator is used to create an instance of an object.
- A.
New
- B.
This
- C.
Void
- D.
Alert
- 24.A _______is a function that creates and initializes an object.
- A.
Constructor
- B.
Object
- C.
Events
- D.
Var
- 25.Which of the following syntax is an example of properly declaring function
- A.
Fun sayHello();
- B.
Func say Hello()
- C.
Book name is : Perl Book name is : Perl function sayHello()
- D.
Function sayHello;