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ICSE Class X Question Bank 2025 : Computer Applications

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ICSE 2024 ANALYSIS OF PUPIL PERFORMANCE COMPUTER APPLICATIONS Research Development and Consultancy Division Council for the Indian School Certificate Examinations New Delhi November 2024 ____________________________________________________________________________________________ Copyright, Council for the Indian School Certificate Examinations All rights reserved. The copyright to this publication and any part thereof solely vests in the Council for the Indian School Certificate Examinations. This publication and no part thereof may be reproduced, transmitted, distributed or stored in any manner whatsoever, without the prior written approval of the Council for the Indian School Certificate Examinations. Council for the Indian School Certificate Examinations (CISCE) MISSION STATEMENT The Council for the Indian School Certificate Examinations is committed to serving the nation's children, through high quality educational endeavours, empowering them to contribute towards a humane, just and pluralistic society, promoting introspective living, by creating exciting learning opportunities, with a commitment to excellence. ETHOS OF CISCE Trust and fair play. Minimum monitoring. Allowing schools to evolve their own niche. Catering to the needs of the children. Giving freedom to experiment with new ideas and practices. Diversity and plurality - the basic strength for evolution of ideas. Schools to motivate pupils towards the cultivation of: Excellence - The Indian and Global experience. Values - Spiritual and cultural - to be the bedrock of the educational experience. Schools to have an 'Indian Ethos', strong roots in the national psyche and be sensitive to national aspirations. FOREWORD The National Education Policy 2020 emphasises building 21st-century skills and competencies through systemic reforms in pedagogy and assessments. It is an endeavour of Council for Indian School Certificate Examinations (CISCE) to ensure that assessments are utilised as tools for promoting learning and development in students rather than a mere end to the instruction year. With the objective to provide feedback on the common errors made by the students in the board examinations of both ISC and ICSE and to provide information on the question-wise performance of students, CISCE releases the Analysis of Pupils Performance document every year. It is one of the unique and best practice of the CISCE board, which supports the candidates in their preparation for the upcoming board examinations. We would like to extend our appreciation to the Research Development and Consultancy Division (RDCD) of the CISCE for their efforts in creating this detailed document for the benefit of our students. We also express our gratitude to the examiners who have provided meticulous feedback on the candidates performance during the examinations and also suggested pedagogical interventions for the teachers to mitigate the common errors made by the candidates. We are sanguine that students, teachers, and parents would make the best use of this document by going through the various sections in detail and implementing the learnings from the same for successful performance in the upcoming examinations. November 2024 Dr. Joseph Emmanuel Chief Executive & Secretary CISCE i PREFACE As you are aware, the Analysis of Pupil Performance document has been developed by the Council for Indian School Certificate Examinations (CISCE) with the objective to provide feedback to teachers on the performance of students in the ICSE and ISC examinations. These subject-wise documents highlight the misconceptions that students might have related to certain topics that are reflected as common errors made by them while answering questions in the examinations. The document also contains certain suggestive teaching strategies to reduce the occurrence of similar errors in forthcoming examinations by students. The criteria used for marking each question has also been provided in brief so that the teachers and students can comprehend the scope of the question and the correct approach to answer it. Topics in the question paper that were found to be difficult or unclear by the majority of the candidates have also been highlighted so that teachers can lay more stress on bringing clarity to them, along with recommendations for candidates to attempt the examination of a particular subject keeping in mind subject-specific nitty-gritty and techniques of answering. The Analysis of Pupil Performance document for ICSE for the Examination Year 2024 covers the following 16 subjects - English Language, Literature in English, Hindi, History and Civics, Geography, Mathematics, Physics, Chemistry, Biology, Commercial Studies, Economics, Computer Applications, Economic Applications, Commercial Applications, Environmental Science and Home Science. The 20 subjects covered in the ISC Analysis of Pupil Performance document for the Year 2024 are Accounts, English Language, Literature in English, Hindi, Economics, Commerce, Business Studies, Mathematics, Physics, Chemistry, Biology, Elective English, History, Political Science, Geography, Psychology, Sociology, Computer Science, Environmental Science and Home Science I extend my appreciation and gratitude to all the ICSE and ISC examiners who have shared their valuable comments on each question. I also acknowledge the efforts of the RDCD team of Dr. Manika Sharma, Ms. Parul Kohli, Ms. Lyimee Saikia and Ms. Mansi Guleria, for their focused hard work and diligence towards the preparation of this document. We are hopeful that this document will be helpful to teachers to bring in timely interventions for the topics required, in order to support the students in their preparation and readiness towards the upcoming ICSE and ISC examinations. We also hope the students learn from the detailed notes on the common errors made while answering, so as to be well-prepared with the correct answering strategies for the upcoming ICSE and ISC examinations. November 2024 Dr. Bhawna Taragi Deputy Head RDCD, CISCE ii COMPUTER APPLICATIONS SECTION A 40 MARKS (Attempt all questions from this Section.) Question 1 [20] Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.) (i) Consider the above picture and choose the correct statement from the following: (ii) (iii) (iv) (v) (a) Polygon is the object and the pictures are classes (b) Both polygon and the pictures are classes (c) Polygon is the class and the pictures are objects (d) Both polygon and the pictures are objects int x = 98; char ch = (char)x; what is the value in ch? (a) b (b) A (c) B (d) 97 The output of the statement "CONCENTRATION".indexOf('T') is: (a) 9 (b) 7 (c) 6 (d) (-1) The access specifier that gives least accessibility is: (a) package (b) public (c) protected (d) private The output of the statement "talent".compareTo("genius") is: (a) 11 1 2024 (vi) (vii) (viii) (ix) (x) (xi) ICSE - Computer Applications (b) 11 (c) 0 (d) 13 Which of the following is an escape sequence character in Java? (a) /n (b) \t (c) /t (d) //n if (a>b&&b>c) then largest number is: (a) b (b) c (c) a (d) wrong expression What is the output of Math.ceil(5.4)+Math.ceil(4.5)? (a) 10.0 (b) 11.0 (c) 12.0 (d) 9.0 What is the method to check whether a character is a letter or digit? (a) isDigit(char) (b) isLetterOrDigit() (c) isLetterOrDigit(char) (d) isLETTERorDIGIT(char) The extension of a Java source code file is: (a) exe (b) obj (c) jvm (d) java The number of bytes occupied by a character array of four rows and three columns are: (a) 12 (b) 24 (c) 96 (d) 48 2 2024 (xii) (xiii) (xiv) (xv) (xvi) (xvii) ICSE - Computer Applications Which of the following data type cannot be used with switch case construct? (a) int (b) char (c) String (d) double Which of the following are entry controlled loops? 1. for 2. while 3. do..while 4. switch (a) only 1 (b) 1 and 2 (c) 1 and 3 (d) 3 and 4 Method which reverses a given number is: (a) Impure method (b) Pure method (c) Constructor (d) Destructor If the name of the class is Yellow , what can be the possible name for its constructors? (a) yellow (b) YELLOW (c) Yell (d) Yellow Invoking a method by passing the objects of a class is termed as: (a) Call by reference (b) Call by value (c) Call by method (d) Call by constructor The correct statement to create an object named mango of class fruit: (a) Fruit Mango= new fruit(); (b) fruit mango = new fruit(); (c) Mango fruit=new Mango(); (d) fruit mango= new mango(); 3 2024 (xviii) ICSE - Computer Applications Assertion (A): Static method can access static and instance variables. Reason (R): Static variable can be accessed only by static method. (xix) (a) Assertion and Reason both are correct. (b) Assertion is true and Reason is false. (c) Assertion is false and Reason is true. (d) Assertion and Reason both are false. What is the output of the Java code given below? String color [ ] = {"Blue", "Red", "Violet"}; System.out.println(color[2].length()); (xx) (a) 6 (b) 5 (c) 3 (d) 2 Which of the following mathematical methods returns only an integer? (a) Math.ceil(n) (b) Math.sqrt(n) (c) Math.floor(n) (d) Math.round(n) 4 2024 ICSE - Computer Applications Comments of Examiners (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) (x) (xi) (xii) (xiii) (xiv) (xv) (xvi) Many candidates were not clear about the concept of class and object and they found the picture-based question confusing. Many candidates lacked conceptual clarity on typecasting and were confused by ASCII codes. Some of them were unsure about the correct answer, as the options were given in the form of alphabets. A few candidates got confused with the index numbers as they considered the beginning from 1 instead of 0 and hence incorrectly derived the answer as (b) instead of the correct option (c). Few candidates wrote public instead of private as probably they were using only public throughout the programming and may not be introduced to the other access specifiers. Few candidates wrote the wrong options indicating lack of knowledge of compareTo() working. Few other candidates got confused with the sign and wrote all the ASCII codes and to calculate the value. Most of the candidates gave correct answers. However, few candidates got confused with (/) and (\). Many candidates have considered the whole question as a java statement and accordingly gave incorrect answers. Most of the candidates who attempted this question answered it correctly. A number of candidates answered this question correctly. Majority of the candidates answered this question correctly. Some candidates answered this question correctly. A few candidates wrote 48 bytes which was incorrect. This question was well attempted by most of the candidates. Majority of the candidates answered this question correctly. Most of the candidates who attempted this question answered it correctly. Many candidates were confused with the case of the answer. Few students gave the answer as yellow where the letter Y was not identifiable as uppercase or lowercase Most of the candidates answered this question correctly. 5 Suggestions for teachers Explain the levels of class and objects and explain that T is the structure that depicts the overall differentiation of class and object. Provide more practice of picture-based question in class along with giving real life examples to explain object. Explain the Range of ASCII codes. Teach the concept of typecasting need with appropriate examples. Ensure thorough practice on the conversion between char and int through numerous workout examples. Provide sufficient practice of Multiplechoice questions. Instruct students to write only one option while answering multiple-choice questions. Instruct students to write the index number just above the characters of the given String starting from zero to avoid any confusion. Ensure thorough practice of students on String methods involving character extraction and indexing. Explain all access specifiers practically and with examples highlight the limitations of each access specifier. Train students to calculate the difference between the characters without writing the ASCII code and by providing ample number of examples. Teach the operators in java by clearly explaining the division operator (/) (slash). Emphasize on the importance of [\] [back slash) while teaching the escape sequences along with providing many examples. Explain simple statement and compound statement with examples. Give thorough practice of Math method outputs with the help of short, simple exercises in class as a quiz or as a game. Teach the upgraded Java IDE and adhere to the latest development of the language. Give thorough practice of Math method outputs with the help of short, simple exercises in class as a quiz or as a game. Teach the upgraded Java IDE and adhere to the latest development of the language. 2024 ICSE - Computer Applications (xvii) Majority of the candidates answered this question correctly. However, a few candidates were confused with the name of the class, object and case sensitivity. (xviii) Some candidates were unclear with the static and accessibility concept. (xix) Most of the candidates answered correctly except a few who opted 3 as the answer which was incorrect. (xx) Majority of the candidates were able to answer this question correctly. 6 Suggestions for teachers Explain the concept of entry control and exit control with appropriate examples and pictorial representation of the loop structures which will be helpful for the students to understand the concept better also, make use of flowcharts. Clarify that in entry control loops the decision box comes first and then the statements, and, in an exit, control loop the decision box comes after the statements. Teach the concept of types of functions with an emphasis on Call by reference and Call by value with primitive and nonprimitive data types. Ensure practice of questions giving importance to case sensitivity. Explain the features of constructors and emphasize on the class naming conventions. Demonstrate the working of a constructor with examples and clarify the concept of Call by Value and pass by reference clearly to the students. Adhere to the scope of the syllabus and teach accordingly. Explain pass by reference by giving appropriate examples. Clearly explain the statement to create an object of a class with proper syntax. Facilitate revision of Java statements to create the objects of different classes by conducting quiz in the class. Ensure adequate practice of Assertion and Reason questions for all the concepts. Explain static and non-static methods with appropriate examples for better conceptual clarity. Explain the concept of the source file name and its extension. Clarify the number of bytes occupied by each primitive data type and provide adequate practice of the same. Ensure that students can calculate the number of elements of a double dimensional array. 2024 ICSE - Computer Applications Question 1 MARKING SCHEME (i) (c) Polygon is the class and the pictures are objects (ii) (a) b (iii) (c) 6 (iv) (d) private (v) (d) 13 (vi) (b) \t (vii) (c) a (viii) (b) 11.0 (ix) (c) isLetterOrDigit(char) (x) (d) java (xi) (b) 24 (xii) (d) double (xiii) (b) 1 and 2 (xiv) (b) (xv) (d) Yellow (xvi) (a) Call by reference (xvii) (b) fruit mango = new fruit(); Pure method (xviii) (c) Assertion is false and reason is true (xix) (a) 6 (xx) (d) Math.round (n) 7 2024 ICSE - Computer Applications Question 2 (i) [2] Write Java expression for: | + | (ii) 2 + 2 [2] Evaluate the expression when x is 4: x + = x + + * + + x % 2; (iii) Rewrite the following do while program segment using for: [2] x = 10; y = 20; do { x++; y++; } while (x<=20); System.out.println(x * y ); (iv) Give the output of the following program segment. How many times is the loop executed? [2] for(x=10; x>20;x++) System.out.println(x); System.out.println(x*2); (v) String s1 = "45.50"; String s2 = "54.50"; [2] double d1=Double.parseDouble(s1); double d2=Double.parseDouble(s2); int x= (int)(d1+d2); What is value of x? (vi) Consider the following two-dimensional array and answer the questions given below: [2] int x[ ][ ] = {{4,3,2}, {7,8,2}, {8, 3,10}, {1, 2, 9}}; (a) What is the order of the array? (b) What is the value of x[0][0]+x[2][2]? (vii) Differentiate between boxing and unboxing. [2] (viii) The following code to compare two strings is compiled, the following syntax error was displayed incompatible types int cannot be converted to boolean. Identify the statement which has the error and write the correct statement. Give the output of the program segment. [2] 8 2024 (ix) ICSE - Computer Applications void calculate() { String a = "KING", b = "KINGDOM"; boolean x = a.compareTo(b); System.out.println(x); } Consider the given program and answer the questions given below: class temp [2] { int a; temp() { a=10; } temp(int z) { a=z; } void print() { System.out.println(a); } void main() { temp t = new temp(); temp x = new temp(30); t.print(); x.print(); } } (a) What concept of OOPs is depicted in the above program with two constructors? (b) What is the output of the method main()? (x) Primitive data types are built in data types which are a part of the wrapper classes. These wrapper classes are encapsulated in the java.lang package. Non primitive datatypes like Scanner class are a part of the utility package for which an object needs to be created. (a) To which package the Character and Boolean classes belong? (b) Write the statement to access the Scanner class in the program. 9 [2] 2024 ICSE - Computer Applications Comments of Examiners (i) Many candidates either missed the math.abs ( ) in the numerator or ignored the | | symbol. They were unable to understand the symbol of the absolute function as | |. (ii) Some candidates were not clear with the concept of pre and post increment or decrement expressions while others were unclear with the concept of shorthand operators. (iii)Most of the candidates failed to implement the conversion of a do while loop to a for loop. Many candidates were not clear with multiple variables in the do while statement and the empty for loop. (iv) Most of the candidates understood the false condition at the beginning would result in zero iterations. But at the same time for output of the loop gave two lines about output failing to understand the missing braces after the loop indicates the very next statement to be the body of the loop. Some candidates were not clear, and they did the output for all the values ranging from 10 to 20 and lost marks. (v) Some candidates rounded off the number and then did the addition also some of them ignored the Type casting leading to a wrong answer. A few candidates could not convert the string into double and just concatenated the strings. (vi) (a)Some candidates failed to understand the concept of order of a two-dimensional array while some others could connect to their mathematics chapter matrices and answer correctly. (b)Some of the candidates could not access the elements of a 2D array by their index and hence made mistakes. (vii) Many candidates could answer this question well but a few interchanged the answers and lost marks. (viii) Majority of the candidates gave the correct answer either by changing the data type or by changing the method itself. Some candidates did not study the case study properly and simply copied the question while some others made mistakes in the output. (ix)(a)Some of the candidates were not clear with the concept of oops. (b) Most of the candidates skipped the first print method call and only gave the correct output for the x.print method. 10 Suggestions for teachers Clearly explain Java expressions with math method and give clear instructions with respect to the parenthesis and operators. Provide adequate practice with more expressions. Teach the concept of operators in class along with Pre increment or decrement change and use, and Post increment or decrement change and use. Provide more practice for evaluation of the expression from left to right of the expression following the hierarchy of the operators and not the BEDMAS or BODMAS rules. Clearly explain the conversion of one type of loop to another. Provide practice of variety of fordowhile-while conversions in the class. Ensure that students are clear with the concept of initialization, process to be performed, and condition to be checked when converted to while and do while. Explain that the first print statement should be given in the loop and the second should be given outside the loop. Provide adequate practice to ensure that students are well versed with the concept of looping. Provide more practice to make the students well versed with the looping statements as they are very important for any programming languages. Explain the variations of loops and the step-by-step execution order of a loop. Teach the Rapper class methods concept clearly with the syntax of the method and the return type class to which it belongs to. Clearly explain Type casting to the students and instruct how to represent the answer in correct and required format. Explain the use of parse wrapper class and the type caste operator uses in programs. Guide students that when output is given, we need to follow the steps given in sequence. Clarify about the order of the array, by drawing the appropriate pictures, by storing the values in an array as given in the question. 2024 ICSE - Computer Applications (x) (a)Majority of the candidates correctly gave the answer as java.lang package. However, few candidates lost the mark as they have written the answer as wrapper classes which was incorrect. (b)Many candidates were not clear with the import statement and its usage. 11 Suggestions for teachers Explain the concept of rows and columns clearly by giving real time examples. Provide enough practice of accessing the individual elements of a 2D array with their RAW and column index and demonstrate the memory structure of the 2D array. Explain the concept of boxing and unboxing in simple terms with several examples. Guide students how to answer competency focused questions and acquaint them with the error messages. Train students with the type of errors and the error message. Create and provide practice of situationbased questions to the students. Facilitate revision of programs based on the constructor overloading with simple examples. Explain the concept of global or instance variables with multiple constructors and object creation. Teach all the concepts of Java along with the keywords so that students can correctly interpret the questions. Explain the constructor used in object creation along with the non-static method call after the object creation. Guide students that if it is an output-based question one needs to be clear about the concept of constructor overloading. Explain the concept of method calling with multiple objects. Explain Java.lang and Java. util with the included classes from their respective packages. 2024 ICSE - Computer Applications Question 2 MARKING SCHEME (i) Math.abs(a+b) / Math.sqrt(a*a+b*b) (ii) x=4 (iii) for(x=10,y=20;x<=20;x++,y++); System.out.println(x*y); (iv) Output 20 Loop is not executed even once or Zero times (v) 100 (vi) (a) Order of the array 4 x 3 (b) (vii) 4 + 10 = 14 Conversion of primitive type into an object of its class is called as boxing. Conversion of an object of the wrapper class to a variable of the corresponding data type is called as unboxing. (viii) int x = a.compareTo(b); 3, +3, +68, -68 boolean x = a. equals(b); boolean x = a. equalsIgnoreCase(b); boolean x = a==b; Output false (ix) (a) Polymorphism Overloading Overloading constructors Constructor overloading Multiple constructors (x) (b) 10, 30 (a) (b) java.lang import java.util.*; Scanner ob = new Scanner(System.in) ; 12 2024 ICSE - Computer Applications SECTION B (60 MARKS) (Attempt any four questions from this Section.) Question 3 [15] DTDC a courier company charges for the courier based on the weight of the parcel. Define a class with the following specifications: class name: courier Member variables: name name of the customer weight weight of the parcel in kilograms address address of the recipient bill amount to be paid type D - domestic, I - international Member methods: void accept ( ) to accept the details using the methods of the Scanner class only. void calculate ( ) to calculate the bill as per the following criteria: Weight in Kgs Rate per Kg First 5 Kgs Rs.800 Next 5 Kgs Rs.700 Above 10 Kgs Rs.500 An additional amount of Rs.1500 is charged if the type of the courier is I (International) void print ( ) To print the details void main ( ) to create an object of the class and invoke the methods 13 2024 ICSE - Computer Applications Comments of Examiners Suggestions for teachers Some common errors made by most of the candidates were: Teach this program to the students perfectly as it is scoring and train them well. Explain the declaration of variables, accepting the variables using Scanner class ONLY. Insist on writing the same names of the methods and variables as given in the question. Teach the concept of slab calculation. Lay stress on writing the same class name as given in the question. Explain to students to declare member variables with the appropriate data type and as far as possible to stick to the variable names given in the question. Highlight the importance of writing the same method names as given in the question. Demonstrate the scanner class input for each of the data types especially char and the String class. Provide sufficient practice by solving programs in the class to show how slabbased calculations are used in the program. Explain the occurrence of syntax errors/ compilation errors in case of writing the wrong syntax for the operators. Facilitate practical classes in computer lab to solve programs and explain how an object is created and how to call the member methods using the object name. Lay emphasis on the concept that double quotation is a must for messages. Guide students to always write VDT or use the mnemonics as given in the question. Did not write the same class name or variable names as mentioned in the question. Did not use the compound statements correctly. Not able to accept input for String and char data types with Scanner Class. Not having written the same member method names as mentioned in the question. Not having written the syntax of relational operators properly. Not using the correct slab calculations. Not able to check character condition. Missing double quotation marks in string message. Failed to print the member variable in the print() method. Not having created an object of the class and not calling member methods. A few candidates used the member variables of their choice and did not provide a variable description table to support their answers. 14 2024 Question 3 ICSE - Computer Applications MARKING SCHEME import java.util.*; class courier { String name, address; double bill,weight; char type; Scanner ob=new Scanner(System.in); void accept() { System.out.println("enter name"); name = ob.next(); System.out.println("Enter address"); address=ob.nextLine(); System.out.println("Enter weight"); weight=ob.nextDouble(); System.out.println("Enter type"); type = ob.next().charAt(0); } void calculate() { if(weight<=5) bill=weight*800; else if(weight>5&& weight<=10) bill=5*800+(weight-5)*700; else bill=5*800+5*700+(weight-10)*500; if(type=='I') bill=bill+1500; } void print() { System.out.println(name+"\t"+address+"\t"+type+"\t"+weight+"\t"+bill); } void main() { courier c = new courier(); c.accept(); c.calculate(); c.print(); } } 15 2024 ICSE - Computer Applications Question 4 [15] Define a class to overload the method perform as follows: double perform (double r, double h) to calculate and return the value of Curved surface area of cone void perform (int r, int c) = = 2 + 2 Use NESTED FOR LOOP to generate the following format r = 4, c = 5 output 12345 12345 12345 12345 void perform (int m, int n, char ch) to print the quotient of the division of m and n if ch is Q else print the remainder of the division of m and n if ch is R Comments of Examiners Some of the common errors made by the Suggestions for teachers candidates were: Clearly explain the overloading concept Most of the candidates did not use the by giving the necessary instructions. method overloading concept in the While explaining emphasise that the same program. name to the methods follow the signature Many candidates did not use the same of the method given in the question. method name as given in the question. Provide sufficient practice of programs for the concept of overloading. Many candidates did not convert the Explain that for Methods following mathematical expression to Java overloading and methods written as per statements correctly. the given instructions or signature given Few candidates accepted the values in the in the question, students need NOT create method instead of using the arguments. an object to invoke the methods. Calculation of CSA in the first method was jumbled, instead of using a return statement candidates have used print. In nested loop method some candidates got confused about what to print Afew candidates forgot to write the println statement after the inner loop. In the third method some candidates calculated m/ N and m%n, but did not print the same. 16 2024 Question 4 ICSE - Computer Applications MARKING SCHEME class overload { double perform (double r, double h) { double l, csa; l = Math.sqrt(r*r+h*h) ; csa = 22.0/7*r*l; return csa; } void perform(int r, int c) { int x,y; for(x=1;x<=r;x++) { for(y=1;y<=c;y++) { System.out.print(y); System.out.println(); } } void perform(int m, int n, char ch) { if(ch=='Q'||ch=='q') System.out.println(m/n); else if(ch=='R' || ch=='r') System.out.println(m%n) } } 17 2024 ICSE - Computer Applications Question 5 [15] Define a class to accept a number from user and check if it is an EvenPal number or not. (The number is said to be EvenPal number when number is palindrome number (a number is palindrome if it is equal to its reverse) and sum of its digits is an even number.) Example: 121 is a palindrome number Sum of the digits 1+2+1 = 4 which is an even number Comments of Examiners A few candidates answered this question correctly. Some common errors observed were: Many candidates failed to declare and initialize the variables. Many candidates failed to save the duplicate copy of the input number. Some students wrote to while loop constructs to evaluate the reverse and sum of the digits. Few candidates wrote a complicated logic of accepting the number in the form of a string extract convert. Some candidates worked on the sample input given and did not accept a number. Some candidates missed the message not a evenpal number. Question 5 Suggestions for teachers Clarify the concept of extracting and manipulating the digit. Provide practice through step wise execution and a dry Run for the programs to give a clear picture to the students. Stress on the importance of storing the original value in a temporary variable. Emphasize on the fact that students need to process both true and false part of a condition and generate the appropriate message accordingly. MARKING SCHEME import java.util.*; class EvenPal { void EvenPal( ) { Scanner sc= new Scanner ( System.in); System.out.println( enter number ); int n=sc.nextInt(); int rev=0; int s=0; int num=n; while(n>0) { int rem=n%10; rev=rev*10+rem; s+=rem; n/=10; } if(num==rev &&s%2==0) System.out.println( EvenPal number ); 18 2024 ICSE - Computer Applications else System.out.println ( not EvenPal number ); } } Question 6 [15] Define a class to accept values into an integer array of order 4 x 4 and check whether it is a DIAGONAL array or not. An array is DIAGONAL if the sum of the left diagonal elements equals the sum of the right diagonal elements. Print the appropriate message. Example: 3 4 2 5 Sum of the left diagonal elements = 2 5 2 3 3 + 5 + 2 + 1 = 11 5 3 2 7 Sum of the right diagonal elements = 1 3 7 1 5 + 2 + 3 + 1 = 11 Comments of Examiners Some candidates used a loop to calculate the left and right diagonal totals. Few candidates did not read the question attentively and missed checking the equality of the left and right diagonal totals. Suggestions for teachers 19 Emphasize on reading the question carefully and to answer accordingly. Explain the declaration of a 2D array and accepting the values into the array using scanner class or a method argument or a constructor. Highlight the need to handle both the true and false conditions and print appropriate messages as specified in the question. 2024 Question 6 ICSE - Computer Applications MARKING SCHEME class special { int x[][]=new int[4][4]; special(int z[][]) { x=z; } void special() { int r,c,ld=0,rd=0; for(r=0;r<4;r++) { for(c=0;c<4;c++) { if(r==c) ld+=x[r][c]; if(r+c==3) rd+=x[r][c]; } } if(ld==rd) System.out.println("Diagonal Array"); else System.out.println("Not a diagonal array"); } } Question 7 Define a class pin code and store the given pin codes in a single dimensional array. Sort these pin codes in ascending order using the Selection Sort technique only. Display the sorted array. 110061, 110001, 110029, 110023, 110055, 110006, 110019, 110033 20 [15] 2024 ICSE - Computer Applications Comments of Examiners Many candidates did insertion sort instead of selection sort and some of the other common errors observed were: Wrong data type for array. Array was not initialized. Array size was not correctly calculated, nor length statement was used. Insertion or bubble sort logic implemented instead of selection sort. The criteria check was not made between the two correct elements. The logical operator for ascending order was inverted. Swap was not correctly implemented. The sorted array was not displayed. No loop was used to display the elements of the sorted array. Question 7 Suggestions for teachers Emphasize on the sorting methods bubble and selection by giving several examples. Illustrate the technique of bubble sort and selection sort with appropriate steps on the board for different data types. Provide practice to students to do the illustration for the given array for sorting the array in ascending or descending order using the Bubble sort or the Selection Sort techniques. Clearly explain the selection sort process by giving a stepwise representation along with a dry run with different examples to make the concept clear. MARKING SCHEME class pincodes { public static void main(String args[]) { int [] arr= {110061, 110001, 110029, 110023, 110055,110006,110019,110033}; int n = arr.length; for (int i = 0; i < n-1; i++) { int min_idx = i; for (int j = i+1; j < n; j++) {if (arr[j] < arr[min_idx]) min_idx = j;} int temp = arr[min_idx]; arr[min_idx] = arr[i]; arr[i] = temp; } for (int i=0; i<n; ++i) System.out.print(arr[i]+" "); System.out.println(); }} 21 2024 ICSE - Computer Applications Question 8 [15] Define a class to accept the gmail id and check for its validity. A gmail id is valid only if it has: @ . (dot) gmail com Example: icse2024@gmail.com is a valid gmail id. Comments of Examiners Many candidates attempted to substantiate their answer with various logic for this program. This pattern of question was asked for the first time and only some candidates could answer correctly. Marks were allotted to candidates who have checked in the string ends with @ gmail.com. Suggestions for teachers Question 8 Ensure that students understand that various string methods should be tried to implement the logic of the program. Explain and encourage students to use index of and substring methods to process string data to get the solution. Facilitate more programs on validation of Strings in the classroom. Familiarize students with all the string methods. Provide adequate practice for string methods. MARKING SCHEME class validmail { String s; validmail(String y) { s=y; } void check() { int p,q; char ch; p=s.indexOf('@'); q=s.indexOf('.'); if(p==-1) { System.out.println("invalid - no @"); 22 2024 ICSE - Computer Applications System.exit(0); } if(q==-1) { System.out.println("invalid - no ."); System.exit(0); } String a = s.substring(p+1,q); String b= s.substring(q+1); if(a.equalsIgnoreCase("gmail")==false) { System.out.println("invalid - no gmail"); System.exit(0); } if(b.equalsIgnoreCase("com")==false) { System.out.println("invalid - no com"); System.exit(0); } System.out.println("Valid Email id"); } } 23 2024 ICSE - Computer Applications GENERAL COMMENTS Topics found difficult by candidates Question 1(ix)(a): Concept of oops Question 1(x): Creation of an object Question 1(xviii): Assertion and reasoning based questions Question 1: Picture based and situation-based questions Question 2(i): Java expressions Question 2(iv): Conversion of the loops Question 2(vi)(a): Order of the array Question 2(ix)(a): Constructor overloading Concepts in which candidates got confused CompareTo method Selection Sort was confused with bubble sort Confusion in mathematics Competency and situation based questions Suggestions for candidates To excel in this subject, students need to be passionate about solving problems using programming as a tool. This subject requires more logical and analytical skills than rote learning. Practice more programming problems, output questions, and conversions. Practice writing the program on paper first and then executing it on the system. During the examination, read the instructions for each question thoroughly. Utilize the full 15 minutes of reading time. Write the variable description table for every program solved in Section B. Multiple-choice questions should be answered by selecting the correct option, as given in the question. Do not write multiple answers. Do not waste your time writing the answer when the option is required. In method overloading programs, the main function need not be written; follow the specifications given in the question, if any. For input of variables, the use of the Scanner class, method arguments, or a constructor can be used. Write the list of variables or the variable description table for every program. 24

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