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ICSE Class X Board Exam 2019 : Computer Applications

6 pages, 32 questions, 2 questions with responses, 2 total responses,

Akarsh Jain Badkul
Smt. Lilavatibai Podar High School (LPHS), Mumbai

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COMPUTER APPLICATIONS (Theory) (Two Hours) Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this Paper is the time allowed for writing the answers. This Paper is divided into two Sections. Attempt all questions from Section A and any four questions from Section B. The intended marks for questions or parts of questions are given in brackets[ ]. SECTION A (40 Marks) Attempt all questions Question 1. (a) Name any two basic principles of Object-oriented Programming. [2] (b) Write a difference between unary and binary operator. [2] (c) Name the keyword which: [2] (i) indicates that a method has no return type. (ii) makes the variable as a class variable. (d) Write the memory capacity (storage size) of short and float data type in bytes. [2] (e) Identify and name the following tokens: [2] (i) public (ii) 'a' (iii) == (iv) { } This Paper consists of 6 printed pages. T19 861 Copyright Reserved Turn Over Question 2. (a) Differentiate between if else if and switch-case statements. [2] (b) Give the output of the following code: [2] String P = "20", Q ="19"; int a = Integer.parseInt(P); int b = Integer.valueOf(Q); System.out.println(a+""+b); (c) What are the various types of errors in Java? [2] (d) State the data type and value of res after the following is executed: [2] char ch = '9'; res= Character.isDigit(ch); (e) What is the difference between the linear search and the binary search [2] technique? Question 3. (a) Write a Java expression for the following: [2] | x2+2xy | (b) Write the return data type of the following functions: [2] (i) startsWith( ) (ii) random( ) (c) If the value of basic=1500, what will be the value of tax after the following [2] statement is executed? tax = basic>1200 ? 200 :100; (d) Give the output of following code and mention how many times the loop will execute? int i; for( i=5 ; i>=1 ;i--) { if(i%2 ==1) continue; System.out.print( i+ '' ''); } T19 861 2 [2] (e) State a difference between call by value and call by reference. [2] (f) Give the output of the following: [2] Math.sqrt(Math.max(9,16)) (g) Write the output for the following: [2] String s1 = ''phoenix''; String s2 =''island'' ; System.out.println (s1.substring(0).concat (s2.substring(2) ) ); System.out.println(s2.toUpperCase()); (h) Evaluate the following expression if the value of x=2, y=3 and z=1. [2] v=x+ --z+ y++ +y (i) String x[] = {"Artificial intelligence", "IOT", "Machine learning", "Big data"}; [2] Give the output of the following statements: (i) System.out.println(x[3]); (ii) System.out.println(x.length); (j) What is meant by a package? Give an example. [2] SECTION B (60 Marks) Attempt any four questions from this Section. The answers in this Section should consist of the Programs in either Blue J environment or any program environment with Java as the base. Each program should be written using Variable descriptions/Mnemonic Codes so that the logic of the program is clearly depicted. Flow-Charts and Algorithms are not required. Question 4. Design a class name ShowRoom with the following description: [15] Instance variables / Data members: String name - To store the name of the customer long mobno - To store the mobile number of the customer double cost - To store the cost of the items purchased double dis - To store the discount amount T19 861 3 Turn Over double amount - To store the amount to be paid after discount Member methods: ShowRoom( ) - default constructor to initialize data members void input( ) - To input customer name, mobile number, cost void calculate( ) - To calculate discount on the cost of purchased items, based on following criteria Discount (in percentage) Cost Less than or equal to ` 10000 5% More than ` 10000 and less than or equal to ` 20000 10% More than ` 20000 and less than or equal to ` 35000 15% More than ` 35000 20% void display( ) - To display customer name , mobile number , amount to be paid after discount. Write a main method to create an object of the class and call the above member methods. Question 5. Using the switch-case statement, write a menu driven program to do the following: (a) To generate and print Letters from A to Z and their Unicode Letters T19 861 Unicode A 65 B 66 . . . . . . Z 90 4 [15] (b) Display the following pattern using iteration (looping) statement: 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 Question 6. Write a program to input 15 integer elements in an array and sort them in ascending [15] order using the bubble sort technique. Question 7. Design a class to overload a function series( ) as follows: [15] (a) void series (int x, int n) To display the sum of the series given below: x1 + x2 + x3 + xn terms (b) void series (int p) To display the following series: 0, 7, 26, 63 . p terms (c) void series ( ) To display the sum of the series given below: 1 1 1 1 + + ................ 2 3 4 10 Question 8. Write a program to input a sentence and convert it into uppercase and count and [15] display the total number of words starting with a letter 'A'. Example: Sample Input: ADVANCEMENT AND APPLICATION OF INFORMATION TECHNOLOGY ARE EVER CHANGING. Sample Output: Total number of words starting with letter 'A' = 4. T19 861 5 Turn Over Question 9. A tech number has even number of digits. If the number is split in two equal halves, then the square of sum of these halves is equal to the number itself. Write a program to generate and print all four digits tech numbers. Example: Consider the number 3025 Square of sum of the halves of 3025 = (30+25)2 = (55)2 = 3025 is a tech number. T19 861 6 [15]

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