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11th Computer Applications Unit 14 Introduction to Javascript Book Back Questions

Published on: 09/09/2019

Introduction to Javascript

Download Tamil Nadu 11th Standard Computer Applications question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 11th Standard - Computer Applications

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Questions:

Multiple Choice Question

5 x 1 = 5

How many attributes specifies for < script > tag in the scripting language?

(a)

(b)

(c)

(d)

Expand DHTML

(a)

Distance Hyper Text Markup language

(b)

Dynamic Hyper Text Markup language

(c)

Distance High Text Markup language

(d)

Dynamic High Text Markup language

Java Scripts can be implemented using which statements?

(a)

< head >

(b)

< Java >

(c)

< script >

(d)

< text >

Expand CGI

(a)

Common Gateway Interface

(b)

Complex Gateway Information

(c)

Common Gateway Information

(d)

Complex Gateway Interface

Which provide a common scripting language to web developers to design, test and deploy Internet Application?

(a)

(b)

C++

(c)

Java

(d)

Javascript

Generic 2

3 x 2 = 6

What is the uses of prompt dialog box?

Write the role of variable in JavaScript.

Write note on types of Operator.

Generic 3

3 x 3 = 9

Difference between the increment and Decrement operator.

10.

What are the uses of Logical Operators?

11.

Write about tag.

Generic 5

2 x 5 = 10

12.

Explain about the Arithmetic operator with suitable example.

13.

Explain about the popup dialog boxes in JavaScript.

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Answers Key:

Multiple Choice Question

5 x 1 = 5

(a)
2

(b)
Dynamic Hyper Text Markup language

(a)
Common Gateway Interface

(d)
Javascript

Generic 2

3 x 2 = 6

The prompt dialog box is very useful when the user want to pop-up a text box to get user input. Thus, it enables you to interact with the users

Variables are declared in JavaScript using var keyword that allocates storage space for new data and indicates to the interpreter that a new identifier is in use.

The type of operator is used to get the data type (returns a string) of its operand. The operand can be either a literal or a data structure such as a variable, a function, or on object.

Generic 3

3 x 3 = 9

Increment Operator	Decrement Operator
The ++ operator increments its single operand.	The -- operator decrements its single operand
Its converts its operand to a number, adds 1 to that number, and assigns the incremented value back into the Operand	Its converts its operand to a number, subtracts 1 to that number, and assigns the decremented value back into the operand
Post increment: var m=3, n=m++; Pre increment: var m=3, n=++;	Post decrement: var m=3, n=m--; Pre decrement: var m=3, n=m--;

10.

Logical operators perform logical (boolean) operations. Logical operators combine or invert boolean values. Once comparisons are made, the logical operators && (AND), || (OR) and ! (NOT) can be used to create more complex conditions.
Best practice is to use logical operators on boolean operands., However, operands of any type can be combined. The strict rules are as follows:
(i) For & & (AND) the result is false if the first operand is false; otherwise, the result is the Boolean value of the second operand.
(ii) For || (OR) the result is true if the first operand is true; otherwise, the result is the Boolean value of the second operand.
(iii) For | (Not)the result is true if the operand is false; otherwise, the result is true.

11.

JavaScript can be implemented using .... tags. The tag containing JavaScript can be placed anywhere within in the web page, but it is normally recommended to be kept within the \(<head>\) tags. The tag alerts the browser program to start interpreting all the text between these tags as a script command.

Generic 5

2 x 5 = 10

12.

Javascript supports all the basic arithmetic operators like addition (+),subtraction (-) multiplication (*), division (/), and modulus (%, also known as the remainder operator)
Arithmetic operators :

Arithmetic Operator	Meaning	Example	Result
+	Addition	var sum = 20 + 120	Variable sum = 140
-	Subtraction	var diff = 120 - 20	Variable diff = 100
*	Multiplication	var prod = 10*100	Variable prod = 1000
/	Division	var res = 100 / 522	Variable res = 5.22
%	Modulus operator	var rem = 100 % 522	Variable rem = 22 (remainder)

13.

JavaScript supports three important types of dialog boxes. Dialog boxes are also called as Popup Boxes. These dialog boxes can be used to raise an alert, or to get confirmation on any input or to have a kind of input from the users.JavaScrípt supports three kind of popup boxes: Alert box, Confirm box, and Promnpt box.
Alert Dialog Box: An alert dialog box is mostly used to give a warning message to the users. For example, if one input field requires to enter some text but the user does not provide any input, then as a part of validation, you can use an alert box to give a warning message. Alert box gives only one button "OK" to select and proceed.
The syntax of alert box is
alert("Message");
(or) Window.alert ("Message");
Example:
alert("Name is compulsory entry);
(or) window.alert("Name is compulsory entry");
Confirm Dialog Box : A confirmation dialog box is mostly used to take user's consent on any option. It displays a dialog box with two buttons: OK and Cancel. If the user clicks on the OK button, the confirm() will return true. If the user clicks on the Cancel button, then confirm() returns false.
The syntax of confirm dialog box is
confirm("message");
(or)
window.confirm("message");
Example :
confirm("Hai Do you want to continue:");
(or)
window.confirm(“Hai Do you want to continue:");
Prompt Dialog Box: The prompt dialog box is very useful when the user want to pop-up a text box to get user input. Thus, it enables you to interact with the user. The user needs to fill in the text box field and then click OK.
The prompt dialog box is displayed using a method called prompt()which takes two parameters :
(i) a label which you want to display in the text box and (ii) a default string to display in the text box. This dialog box has two buttons: OK and Carncel. If the user clicks the OK button, the prompt() will return the entered value from the text box. If the user clicks the Cancel button, the prompt() returns null. The Sntax of prompt dialog box is,
Prompt("Message","default Value");
(or)
window.prompt("sometext","defaultText");
Example:
prompt("Enter Your Name:"Name");
(or)
window.prompt("Enter Your Name:"Name");