Web Design and Development — DU B.Sc. (Hons) Computer Science Previous Year Question Papers

This paper contains two sectionsSection A and Section B. Each question in Section B carries 15 marks. Parts of a question must be answered together. 1. (a) Write an HTML tag to set a background image in the body of a webpage. Which attributes are used to control the size of the image on an HTML webpage ? Which attributes takes the text to be displayed in case the browser is unable to display an image specified in the 'sre' attribute of the image tag ? (b) Write a JavaScript code to check whether a number is a multiple of 5. 3 (c) Write a PHP script to print the sum of odd digits of a four-digit number. 4 (d) Differentiate between internal and external linking in HTML with the help of an example. (e) Write HTML code to design the given HTML form with the following validations in (i) "Student ID' is a 10-digit alphanumeric value "Name" should be an alphabetical value (String) STUDENT REGISTERATION FORM Write the output of the following codes with justification: $b = "+100"; if ($a == $b) echo "1"; if (Sa === $b) echo "2"; ?> Şa = 1; $b = 0; echo (Sa AND $b) ; echo (§a or $b) ; echo (Sa XOR $b) ; echo ! Sa ?> (g) Answer the following : 5 ) Give an example of a paired and unpaired tag in HTML. (ii) Define WWW. (i) Give an example of a right and a left-associative operator in PHP. (iv) List any two datatypes in JavaScript. (v) What do you mean by 'DOCTYPE' in HTML ? 2. (a) What will be the output of the following: "100"+200+300 in JavaScript? Justify your answer. 2 (b) What is an event in JavaScript? What is the purpose of 'onBlur' and 'onFocus' events in JavaScript ? 2 (c) Write a PHP code to find a minimum of three numbers. 3 (d) Differentiate between Pass-by-Value and Pass-by-Reference with the help of an example in PHP. 4 (e) What is the difference between GET and POST methods ? Explain with the help of an example. 4 3. (a) Write an HTML code to display the following list. 5 (1) Web Design and Development (iii) Python attrender tete (b) Write an event-driven program in JavaScript to take a number as input (in an input text box in an HTML form) and display its multiplication table at the click of a button. (c) Write a PHP program to print the following pattern : (b) Write code in HTML to create the following table and display it on a webpage : 4 Station Humidity Max, Min (d) Write a JavaScript code that reads two numbers in an HTML form (as shown below), and when a 'Submit' button in the form is clicked, their sum is displayed in an alert box. 5 First Number Second Number 5. (a) Differentiate between the local and global scope of a variable with the help of an example (b) Write a JavaScript code to display whether a given number is a prime or not. 5 (c) How does a web browser communicate with a web server? Explain with the help of (b) PHP connects to databases using connection objects. Write PHP commands for the following steps : 5