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ICSE Class X Board Exam 2016 : Computer Applications (Solved Paper)

11 pages, 42 questions, 2 questions with responses, 2 total responses,

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ICSE Question Paper 2016 (Solved) Computer Applications Class X SECTION A (40 Marks) Answer all questions from this Section Question 1. (a) Define Encapsulation. [2] Ans. Encapsulation is the process of bundling state (instance variables) and behaviour (methods) is a single unit (class). (b) What are keywords? Give an example. [2] Ans. Keywords are reserved words which convey special meaning to the compiler. They cannot be used as identifiers. Ex: class, void (c) Name any two library packages. [2] Ans. java.util, java.io (d) Name the type of error (syntax, runtime or logical error) in each case given below: [2] (i) Math.sqrt (36-45) (ii) int a;b;c; Ans. (i) Runtime error Math.sqrt(36-45) = Math.sqrt(-9) which cannot be computed as square root of a negative number is not defined. Therefor, a runtime error will be thrown. (ii) Syntax error Multiple variables can be defined in one of the following ways int a, b, c; int a; int b; int c; (e) If int x[] = { 4, 3, 7, 8, 9, 10 }; what are the values of p and q? [2] (i) p = x.length (ii) q = x[2] + x[5] * x[1] Ans. (i) 6 (ii) q = x[2] + x[5] * x[1] = 7 + 10 * 3 = 7 * 30 = 37 Question 2. (a) State the difference between == operator and equals() method. [2] Ans. == compares if the two objects being compared refer to the instance while equals() method which can be overridden by classes generally compares if the contents of the objects are equals. (b) What are the types of casting shown by the following examples: [2] (i) char c = (char)120; (ii) int x = t ; Ans. (i) Explicit casting (ii) Implicit casting (c) Differentiate between formal parameter and actual parameter. [2] Ans. Format parameters are the parameters defined in the signature of a method. Actual parameters are the values passed to the methods on function invocation. Ex: Consider the following code snippet public int add(int a, int b) { return a + b; } // Method invocation int result = add(3, 4); a and b are formal parameters while 3 and 4 are actual parameters. (d) Write a function prototype of the following: [2] A function PosChar which takes a string argument and a character argument and returns an integer value. Ans.public int PosChar(String s, char c) (e) Name any two types of access specifiers. [2] Ans. public, private, protected and default/package access specifiers Question 3. (a) Give the output of the following string functions : [2] (i) MISSISSIPPI .indexOf( S ) + MISSISSIPPI .lastIndexOf( I ) (ii) CABLE .compareTo( CADET ) Ans. (i) MISSISSIPPI .indexOf( S ) + MISSISSIPPI .lastIndexOf( I ) = 2 + 10 = 12 (ii) String s compareTo method compares ASCII values of characters starting from the left. CABLE .compareTo( CADET ) The first and seconds characters are the same in both the strings. So, we compare the third characters. Compare B and D = ASCII value of B ASCII value of D = 66 68 = -2 (b) Give the output of the following Math functions: [2] (i) Math.ceil(4.2) (ii) Math.abs(-4) Ans. (i) 5.0 (and not 5, as ceil() returns a double) (ii) 4 (c) What is a parameterized constructor? [2] Ans. A parameterized constructor is a constructor that accepts arguments which are used to initialize the object being created. (d) Write down java expression for : [2] T = square root (A2 + B2 + C2) Ans. double T = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2) + Math.pow(c, 2)); (e) Rewrite the following using ternary operator : [2] if(x%2 == 0) System.out.print("EVEN"); else System.out.print("ODD"); Ans. System.out.print(x % 2 == 0 ? "EVEN" : "ODD"); (f) Convert the following while loop to the corresponding for loop : [2] int m = 5, n = 10; while (n>=1) { System.out.println(m*n); n -; } Ans. for(int m=5, n=10; n >=1; n--) { System.out.println(m*n); } (g) Write one difference between primitive data types and composite data types. [2] Ans. A primitive data type is not composed of other data types. Ex: int, float, double while a composite data type is composed of other data types. Ex: class (h) Analyze the given program segment and answer the following questions : [2] (i) Write the output of the program segment (ii) How many times does the body of the loop gets executed? for(int m=5; m<=20; m+=5) { if(m%3 == 0) break; else if(m%5 == 0) System.out.println(m); continue; } Ans. For loop initialization: m = 5 Loop condition check: m <= 20 = 5 <=20 = true Loop execution for first time m%3 == 0 = 5 % 3 == 0 = 2 == 0 = false else is executed m%5 == 0 = 5 % 5 == 0 = 0 == 0 = true 5 is printed Loop increment statement is executed: m+=5 = m = m + 5 = 5 + 5 = 10 Loop condition check: m <= 20 = 10 <=20 = true Loop body is executed second time and 10 is printed Loop increment statement is executed: m+=5 = m = m + 5 = 10 + 5 = 15 Loop condition check: m <= 20 = 15 <=20 = true Loop body is executed third time m%3 == 0 = 15 % 3 == 0 = 0 == 0 = true break statement is executed and loop terminates (i) 5 10 (ii) 3 times (i) Give the output of the following expression : [2] a+=a++ + ++a + - a + a- ; when a = 7 Ans. a+=a++ + ++a + -a + a - ; a = 7 + (a++ + ++a + - a + a -); a = 7 + (7 + 9 + 8 + 8); a = 39 (j) Write the return type of the following library functions : [2] (i) isLetterOrDigit(char) (ii) replace(char,char) Ans. (i) boolean (ii) String SECTION B (60 Marks) Attempt any four questions from this Section. Question 4. Define a class named BookFair with the following description: [15] Instance variables/Data members: String Bname stores the name of the book. double price stores the price of the book. Member Methods: (i) BookFair() Default constructor to initialize data members. (ii) void Input() To input and store the name and the price of the book. (iii) void calculate() To calculate the price after discount. Discount is calculated based on the following criteria. PRICE DISCOUNT Less than or equal to Rs 1000 2% of price More than Rs 1000 and less than or equal to Rs 3000 10% of price More than Rs 3000 15% of price (iv) void display() To display the name and price of the book after discount. Write a main method to create an object of the class and call the above member methods. Ans. import java.util.Scanner; public class BookFair { private String Bname; private double price; public BookFair() { Bname = null; price = 0.0; } public void Input() { Scanner kb = new Scanner(System.in); System.out.print("Enter book name: "); Bname = kb.nextLine(); System.out.print("Enter price: "); price = kb.nextDouble(); } public void calculate() { double discountPercentage = 0; if (price <= 1000) { discountPercentage = 2; } else if (price > 1000 && price <= 3000) { discountPercentage = 10; } else if (price > 3000) { discountPercentage = 15; } price = price - (price * discountPercentage / 100); } public void display() { System.out.println("Name: " + Bname); System.out.println("Price after discount: " + price); } public static void main(String[] args) { BookFair bookFair = new BookFair(); bookFair.Input(); bookFair.calculate(); bookFair.display(); } } Sample output Enter book name: How to Java Enter price: 2500 Name: How to Java Price after discount: 2250.0 Question 5. Using the switch statement, write a menu driven program for the following: [15] (i) To print the Floyd s triangle [Given below] 1 23 456 7 8 9 10 11 12 13 14 15 (ii) To display the following pattern I IC ICS ICSE For an incorrect option, an appropriate error message should be displayed. Ans. import java.util.Scanner; public class Menu { public static void main(String[] args) { Scanner kb = new Scanner(System.in); System.out.println("1. Floyd's triangle"); System.out.println("2. ICSE Pattern"); System.out.print("Enter your choice: "); int choice = kb.nextInt(); switch (choice) { case 1: System.out.print("Enter n (number of lines): "); int n = kb.nextInt(); int currentNumber = 1; for (int i = 1; i <= n; i++) { for (int j = 1; j <= i; j++) { System.out.print(currentNumber + " "); currentNumber++; } System.out.println(); } break; case 2: System.out.print("Enter word: "); String word = kb.next(); for (int i = 0; i < word.length(); i++) { for (int j = 0; j <= i; j++) { System.out.print(word.charAt(j) + " "); } System.out.println(); } break; default: System.out.println("Invalid choice"); break; } } } Sample output 1 1. Floyd s triangle 2. ICSE Pattern Enter your choice: 1 Enter n (number of lines): 5 1 23 456 7 8 9 10 11 12 13 14 15 Sample output 2 1. Floyd s triangle 2. ICSE Pattern Enter your choice: 2 Enter word: ICSE I IC ICS ICSE Sample output 3 1. Floyd s triangle 2. ICSE Pattern Enter your choice: 3 Invalid choice Question 6. Special words are those words which starts and ends with the same letter. [15] Examples: EXISTENCE ,COMIC, WINDOW Palindrome words are those words which read the same from left to right and vice-versa. Example: MALAYALAM MADAM LEVEL ROTATOR CIVIC All palindromes are special words, but all special words are not palindromes. Write a program to accept a word check and print whether the word is a palindrome or only special word. Ans. import java.util.Scanner; public class Words{ public static void main(String[] args){ Scanner kb = new Scanner(System.in); System.out.print("Enter word: "); String word = kb.next(); // Check if word is palindrome String reverse = ""; for (int i = word.length() - 1; i >= 0; i--) { reverse = reverse + word.charAt(i); } if(word.equals(reverse)) { System.out.println("Palindrome"); } // Check if word is a special word char firstLetter = word.charAt(0); char lastLetter = word.charAt(word.length() - 1); if (firstLetter == lastLetter) { System.out.println("Special word"); } } } Sample output 1 Enter word: MALAYALAM Palindrome Special word Sample output 2 Enter word: COMIC Special word Question 7: Design a class to overload a function SumSeries() as follows: [15] (i) void SumSeries(int n, double x) with one integer argument and one double argument to find and display the sum of the series given below: s = (x/1) (x/2) + (x/3) (x/4) + (x/5) to n terms (ii) void SumSeries() To find and display the sum of the following series: s = 1 + (1 X 2) + (1 X 2 X 3) + + (1 X 2 X 3 X 4 X 20) Ans. public class Series { public void SumSeries(int n, double x) { double sum = 0; for (int i = 1; i <= n; i++) { if (i % 2 == 1) { sum = sum + (x / i); } else { sum = sum - (x / i); } } System.out.println("Sum = " + sum); } public void SumSeries() { int sum = 0; for (int i = 1; i <= 20; i++) { int product = 1; for (int j = 1; j <= i; j++) { product = product * j; } sum = sum + product; } System.out.println("Sum = " + sum); } } Question 8: Write a program to accept a number and check and display whether it is a Niven number of not. [15] (Niven number is that number which is divisible by its sum of digits). Example: Consider the number 126. Sum of its digits is 1 + 2 + 6 = 9 and 126 is divisible by 9. Ans. import java.util.Scanner; public class NivenNumber{ public static void main(String[] args){ Scanner scanner = new Scanner(System.in); System.out.print("Enter a number: "); int number = scanner.nextInt(); int sumOfDigits = 0; int copyOfNum = number; while (number > 0) { int remainder = number % 10; number = number / 10; sumOfDigits = sumOfDigits + remainder; } if (copyOfNum % sumOfDigits == 0) { System.out.println("Niven number"); } else { System.out.println("Not a niven number"); } } } Sample output 1 Enter a number: 126 Niven number Sample output 2 Enter a number: 34 Not a niven number Question 9: Write a program to initialize the seven Wonders of the World along with their locations in two different arrays. Search for a name of the country input by the user. If found, display the name of the country along with its Wonder, otherwise display Sorry Not Found! [15] Seven wonders CHICHEN ITZA, CHRIST THE RDEEEMER, TAJMAHAL, GREAT WALL OF CHINA, MACHU PICCHU, PETRA, COLOSSEUM Locations MEXICO, BRAZIL, INDIA, CHINA, PERU, JORDAN, ITALY Example Country Name: INDIA Output: INDIA TAJMAHAL Country Name: USA Output: Sorry Not Found! Ans. import java.util.Scanner; public class SevenWonders { public static void main(String[] args) { String[] sevenWonders = { "CHICHEN ITZA", "CHRIST THE RDEEEMER", "TAJMAHAL", "GREAT WALL OF CHINA","MACHU PICCHU", "PETRA","COLOSSEUM" }; String[] locations = { "MEXICO", "BRAZIL", "INDIA", "CHINA", "PERU", "JORDAN", "ITALY" }; Scanner kb = new Scanner(System.in); System.out.print("Enter country: "); String country = kb.next(); // Search country in the array using linear search int index = -1; for (int i = 0; i < locations.length; i++) { if (locations[i].equals(country)) { index = i; } } if (index != -1) { System.out.println(locations[index] + " - " + sevenWonders[index]); } else { System.out.println("Sorry Not Found!"); } } } Sample output 1 Enter country: INDIA INDIA TAJMAHAL Sample output 2 Enter country: USA Sorry Not Found!

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