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ICSE Class X Board Exam 2025 : Commercial Applications

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Aarya Nandha S Anu
St. Helena's School and Junior College, Pune

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KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 ANSWER KEY________________________________________________ Maximum Marks: 100 Time allowed: 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 (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only.) i. When a class serves as base class for many derived classes , the situation is called a. Polymorphism c. Inheritance b. Encapsulation d. Abstraction ii. The expression which uses the && operator is known as a. Relational b. Logical c. Arithmetic d. Assignment iii. Precedence of shorthand operator is ___________ than Unary operator a. Higher b. Lower c. Equal d. Not related iv. When the object of a wrapper class is assigned to primitive type variable, the object is automatically converted to the primitive type is called as a. Unboxing b. Boxing c. Implicit Conversion d. Inheritance v. How many bytes are allocated for the array a[] if int a [] = new int [4]; a. 40 bytes b. 16 bytes c. 20 bytes d. 32 bytes vi. The wrapper class of char type is a. character b. Chracter c. Character d. Char vii. The output of System.out.print(Math.ceil(Math.min(-4.3,-7.8))); is a. -7.0 b. -8.0 c. 7 d.6 KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 viii. Which of the following is not a token? a. Byte code b. identifiers c. literals d. operators ix. Name the type of error in the following statement System.out.println(10/0); a. Syntax error c. Runtime error b. Logical error d. No error x. The size of the array a[ ]={ 3,8,2,1,12,11,13} is a. 6 b. 7 c. 9 d. 8 xi. The output of the given statements is String a = "Success", b = "Happiness"; boolean h = a.substring(4).equals(b.substring(6)); a. ess b. ness c. true d false xii. ___________ compiles the Java source code into byte code a. Virtual machine c. JVM compiler b. java interpreter d. object code xiii. The java statement to access the 5th character in the string str is: a. str.indexOf(i) c.str.substring(5) b. str.charAt(4) d. str.length() xiv. A method prototype which has function name display() which takes two characters as input and an integer number as a return type is a. void display(int a ,int b) b. int display(int a ,int b) c. int display(char a ,char b) d. char display(int a ,int b) xv. The method compareTo() returns __________ when two strings are equal and in lowercase : a. true b. 0 c. 1 d. false xiv. Which of the following is a valid String constant? a. true b. false c. false d. true KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 xvii. The output of the following snippet is System.out.print("Output is "); for(int m=5;m<=50;m+=5) { if(m%6==0) continue; else if(m%3==0) System.out.println(m); } a. Output is 15 45 b. 16 35 c. Output is 15 d. 45 15 xviii. Assertion (A): A loop that in which there is no statement associated in its body is called as an infinite loop. Reason(R) : In the infinite loop the test condition will always be true. a. Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A) b. Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion(A) c. Assertion (A) is true and Reason (R) is false d. Assertion (A) is false and Reason (R) is true xix. Read the following text and choose the correct answer A constructor is a special member function used to initialise the data members whenever an object is created for the class. The different types of constructors are Default constructor Parameterised constructor How do we invoke a constructor in the program? a. We should create a separate method with the return type as void b. When an object is created the constructor is invoked c. The method call should be initialsed to a data type. d. A pure function needs to be created to call the constructor KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 xx. Assertion (A): When you pass an object as an argument to a function , it is called as pass by reference. Reason(R) : The reference of an object is passed as parameter and not the value of the argument. a. Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A) b. Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion(A) c. Assertion (A) is true and Reason (R) is false d. Assertion (A) is false and Reason (R) is true Question 2 3 i. Write the java expression for ( + )2 Ans: Math.cbrt(Math.pow(a+b),2) ii. Evaluate the expression when the value of p=5 p*=++p + --p/++p +p; Ans: 60 [2] [2] iii. The following code segment should add the fifth and eight elements of the array and display the answer as 56. However the code has errors. Fix the code so that it compiles and runs correctly. [2] int s[]={2,22,3,32,4,42,5,52}; if(s[3]%2==0) int sum=s[5]+s[7]; System.out.println(sum); Ans: sum should be initialized before the if condition and the value s[5] should be changed to s[4] iv. John executes the following line of the program and the answer displayed will be a floating-point value, but he expects to get the answer as 0. Name the error and how can the given statement be modified. System.out.println(Math.sqrt(2)/10); [2] Should explicitly convert the print statement to int System.out.println((int)Math.sqrt(2)/10); The error is logical error v. How many times will the loop be executed? What will be the output? int a=12010;int d; while(a>0) { [2] KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 d=a%100; if(++d/3==0) break; else a=a/1000; System.out.println(d); } Ans: 11 13 The loop will be executed twice vi. What will be the output of the following string methods? a. System.out.println("All the Best".length()/2); Ans: 6 b. System.out.println("Acquatic".equalsIgnoreCase("ACQUATIC")); Ans: true [2] vii. Differentiate between actual and formal parameters. [2] Ans: Actual parameters : Defined in method call. Formal parameters: Parameters in method definition and preceded by data type. viii. Predict the output of the following: String s="123.45"; int x=Integer.parseInt(s.substring(0,3)); float y=Float.parseFloat(s.substring(3)); System.out.println(x+y); Ans: 123.45 ix. Name the following: a. The return type of compareTo function Ans: int [2] [2] b. A principle of OOP, which allows a method to be used for multiple purposes. Ans: Polymorphism x. Give the output of the following code-snippet: double z[]={0.3,4.5,23.0,4.5}; System.out.println(Math.pow((z[1]+z[3]),2)); System.out.println(z.length); Ans: 81.0 4 SECTION B [2] KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 (Answer any four questions from this Section.) The answers in this section should consist of the programs in either BlueJ environment or any program environment with java as the base. Each program should be written using variable description / mnemonic codes so that the logic of the program is clearly depicted. Flowcharts and algorithms are not required Question 3 [15] Design a class named Bill, which will contain the following members: Data Members: units,amt of int data type. Member Functions: Parameterised constructor to initialise units. void show( ) to display the contents of units and amt. void compute(int u ) :calculate the electricity bill with the help of the below mentioned charges: 1 to 100 units Rs.10/unit 100 to 200 units Rs.15/unit 200 to 300 units Rs.20/unit above 300 units Rs.25/unit In the main( ) create an object and initialise u with any value and calculate amt by invoking the compute( ) function and display the contents of U an amt using show( ) function. Class name 1 mark Data members 1 mark Method names 1 mark If conditions together 4 marks( 1 mark each ) Calculation of bill- 4 marks(I mark each) Main method- I mark Creating an object -1 mark Calling of functions- 2 marks( I mark each) Question 4 [15] Write a program to input height of 10 Students in feet ( like 5.8, 6.1, ..) in a single dimensional array. Sort the heights in ascending order, using bubble sort technique and display the sorted array. Variable description 2 marks Initialising the array 1 mark Accepting elements in an array 2marks Bubble sort technique KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 For loop -4 marks(2 marks each for loop) Initializing the vaiables 1 mark Swapping the variables 3 marks Displaying the sorted array 2 marks(I mark for the for loop and 1 mark for the print statement) Question 5 [15] Write a program to accept a string and convert it into uppercase. Replace all the vowels in the string with the character # and display the new string. Variable Description 2 marks Accepting a string -1 mark Initializing a new string 1 mark Upper case conversion 1 mark For loop -2 marks Character extraction 2 marks If condition -3 marks Creating a new string 1 mark Displaying the new string -2 marks Question 6 [15] Write a program to overload the function display() for the following tasks: i) To display the following pattern using the function void pattern (char ch,int n) where n is the number of lines and ch is the character to be printed. ***** **** *** ** * ii) To display the sum of the following series S= 2 + 4 + 6 + . . + Declaring the methods 2 marks(Should include the parameters properly, if not no marks allotted) First method For loops 4 marks(2 marks each) Print statements- 2 marks (1 mark for each statement) Second method Accepting a and n from the user 1 mark Initializing sum = 1 mark KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: Computer Applications Maximum Marks: 100 Time Allowed: 2 hours Date: 24.01.2024 Finding the sum which includes the Math pow function -3 Displaying the sum 1 mark Question 7 [15] Write a program to accept a number and check if it s a Peterson number or not. A number is said to be Peterson if the sum of factorials of each digit is equal to the sum of the number itself. For example: Input: Enter a number=145 Output=1!+4!+5!=145 Variable description 2 marks Accepting a number 1 mark Loop for extraction of numbers 2 marks Number extraction logic 2 marks Loop for finding the factorial 2 marks Initializing the factorial variable 1 mark Finding the factorial logic 2 marks If condition 2 marks Final print statement 1 mark Question 8 [15] Define a class to accept values into a 3 3 array and find the sum of all the odd numbers in the array. Example: Input: A[][]={{ 4 ,5, 6}, { 5 ,3, 2}, { 4, 2, 5}}; Output: Sum of odd numbers=5+5+3+5=18 Variable description 2 marks Initialising the array 2mark Accepting elements in an array 2marks Initializing the sum 1 mark For loop for the calculation 2 mark If condition 2 marks Sum calculation 2 marks Printing the sum 2 marks

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