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May 2025 term · Programming Concepts using Java · BSCS2005

Programming Concepts using Java Quiz 1: 13 July 2025 (May 2025 term)

The IIT Madras BS Programming Concepts using Java (Java) Quiz 1 paper sat on 13 Jul 2025, in the May 2025 term: 15 questions for 100 marks in 120 minutes. Every question is below with its answer. Take it as a timed mock test to be marked, or read it through first.

Questions
15
Marks
100
Duration
120 min
MCQ
11
MSQ
4
Take as mock testPractise with answers

Updated

Official paper: IIT M DIPLOMA AN EXAM QDD2 13 July 2025 · No negative marking.

Question 1

+7 marksOne correct option

Consider the following Java program. When the call stack reaches its maximum depth, which method will be at the top of the call stack?

java
class Example {
    public void methodA(int x) {
        if (x > 0) {
            methodB(x - 1);
        }
    }
    public void methodB(int y) {
        if (y > 0) {
            methodC(y - 1);
        }
    }
    public void methodC(int z) {
        if (z > 0) {
            methodA(z - 1);
        }
    }
}


class TestCallStack {
    public static void main(String[] args) {
        Example e = new Example();
        e.methodA(3);
    }
}
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 1 on its own page

Question 2

+7 marksOne correct option

Consider the Java code below.

java
class Account {
    public void login() {
        System.out.println("Basic login");
    }
}


class User extends Account {
    public void login() {
        super.login();
        System.out.println("User login");
    }
    public void login(String code) {
        System.out.println("User login with code: " + code);
    }
}


class Admin extends User {
    public void login() {
        super.login();
        System.out.println("Admin login");
    }
    public void login(String code) {
        System.out.println("Admin login with code: " + code);
    }
}


public class Test {
    public static void main(String[] args) {
        User obj = new Admin(); // LINE 1
        obj.login();
        obj.login("9999");
    }
}

Choose the correct option.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 2 on its own page

Question 3

+7 marksOne correct option

Consider the Java code given below.

java
class Animal {
    private String name;
    public Animal(String n) {
        name = n;
    }
    public String toString() {
        return "Name: " + name;
    }
}
class Dog extends Animal {
    private String breed;
    public Dog(String n, String b) {
        //LINE 1
        breed = b;
    }
    public String toString() {
        return super.toString() + ", Breed: " + breed;
    }
}
public class Test {
    public static void main(String[] args) {
        Animal dog = new Dog("Rocky", "Golden Retriever");
        System.out.println(dog);
    }
}

Choose the correct option to be filled in place of LINE 1 so that the output is:

Name: Rocky, Breed: Golden Retriever

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 3 on its own page

Question 4

+7 marksOne correct option

Consider the Java code given below:

java
public class SwitchTest {
    public static void show() {
        for (int i = 0; i < 3; i++) {
            switch (i) {
                case 0:
                    System.out.print("Zero ");
                    break;
                case 1:
                    System.out.print("One ");
                case 2:
                    System.out.print("Two ");
                    break;
                default:
                    System.out.print("Default ");
            }
            System.out.println();
        }
    }
    public static void main(String[] args) {
        show();
    }
}

What will the output be?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 4 on its own page

Question 5

+7 marksOne correct option

Consider the Java program below. Choose the correct option to fill in place of the CODE BLOCK so that the output is:

text
Viewing balance
Calculating interest for SavingsAccount
Offering premium benefits
java
class Account {
    void viewBalance() {
        System.out.println("Viewing balance");
    }
}
class SavingsAccount extends Account {
    void calculateInterest() {
        System.out.println("Calculating interest for SavingsAccount");
    }
}
class PremiumSavingsAccount extends SavingsAccount {
    void offerPremiumBenefits() {
        System.out.println("Offering premium benefits");
    }
}
public class BankApp {
    public static void main(String[] args) {
        SavingsAccount acc = new PremiumSavingsAccount();
        acc.viewBalance();
        acc.calculateInterest();
        // CODE BLOCK


    }
}
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 5 on its own page

Question 6

+7 marksOne correct option

Consider the Java code given below.

java
interface Printable {
    void print();
}
class Book implements Printable {
    public void print() {
        System.out.println("Printing Book");
    }
}
class Magazine implements Printable {
    public void print() {
        System.out.println("Printing Magazine");
    }
}
class PrintQueue {
    private Object[] printables = {new Book(), new Magazine()};
    public void startPrinting() {
        for (int i = 0; i < printables.length; i++) {
            // LINE 1
        }
    }
}
public class PrintTest {
    public static void main(String[] args) {
        PrintQueue pq = new PrintQueue();
        pq.startPrinting();
    }
}

Identify the appropriate option to fill in place of LINE 1 such that the output is:

text
Printing Book
Printing Magazine
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 6 on its own page

Question 7

+7 marksOne correct option

Consider the Java code given below.

java
interface Shape {
    public default void draw() {
        System.out.println("Drawing a shape");
    }
}
class Circle implements Shape { // LINE 1
}
class Square implements Shape {
    public void draw() {
        System.out.println("Drawing a square");
    }
}
public class DrawingTest {
    public static void main(String[] args) {
        Shape s1 = new Circle();
        s1.draw(); // LINE 2
        Shape s2 = new Square();
        s2.draw();
    }
}

Choose the correct option.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 7 on its own page

Question 8

+7 marksOne correct option

Consider the code given below.

java
interface Navigator {
    boolean hasNext();
    Object next();
}
abstract class Displayable {
    public abstract void show();
}
class BookShelf {
    private class Book extends Displayable {
        private String title;
        public Book(String t) {
            title = t;
        }
        public void show() {
            System.out.print(title + ", ");
        }
    }
    private class BookIterator implements Navigator {
        private int index;
        public BookIterator() {
            //Constructor
        }
        public boolean hasNext() {
            // Check if there is a next book
        }
        public Object next() {
            // Return the next book


        }
    }
    public Navigator getNavigator() {
        return new BookIterator();
    }
    private Book[] books = {new Book("Swami"), new Book("Pyre"),
                                               new Book("Palace") };
}
public class LibraryTest {
    public static void main(String[] args) {
        BookShelf shelf = new BookShelf();
        Navigator nav = shelf.getNavigator();
        while (nav.hasNext()) {
            ___________________________________; // LINE 1
        }


     }
}

Identify the appropriate statement to fill in the blank at LINE 1, such that the output is: Swami, Pyre, Palace,

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 8 on its own page

Question 9

+6 marksOne correct option

Consider the Java code given below.

java
class Book {
    private String title;
    private int price;


    public Book(String t, int p) {
        title = t;
        price = p;
    }
    public Book(Book ot) {
        title = ot.title;
        price = ot.price;
    }
    public void setPrice(int p) {
        price = p;
    }
    public String toString() {
        return "Title: " + title + ", Price: " + price;
    }
}


public class Test {
    public static void main(String[] args) {
        Book b1 = new Book("Java", 500);
        Book b2 = b1;
        Book b3 = new Book(b1);


        b2.setPrice(600);
        System.out.println("b1: " + b1);
        System.out.println("b3: " + b3);
    }
}

What will the output be?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 9 on its own page

Question 10

+6 marksOne correct option

Consider the following Java code.

java
interface Printer {
    default void print() {
        System.out.println("Printing document");
    }
}


interface Scanner {
    default void print() {
        System.out.println("Scanning document");
    }
}


class MultiFunctionDevice implements Printer, Scanner { // LINE 1
}


public class OfficeTest {
    public static void main(String[] args) {
        MultiFunctionDevice mfd = new MultiFunctionDevice();
        mfd.print(); // LINE 2
    }
}

Choose the correct option.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 10 on its own page

Question 11

+6 marksOne correct option

Consider the Java code given below.

java
class Employee {
    public void show() {
        System.out.println("Employee::show()");
    }
}
class Department {
    public Manager getManager() {
        return new Manager();
    }
    private class Manager extends Employee {
        public void show() {
            System.out.println("Manager::show()");
        }
    }
}
public class CompanyTest {
    public static void main(String[] args) {
        Department dept = new Department();
        // LINE 1
        managerObj.show();
    }
}

Choose the correct option for LINE 1 such that the program generates the following output.

Manager::show()

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 11 on its own page

Question 12

+6 marksOne or more correct options

Which of the following statements correctly describe interface and specification in software components?

Select all that apply.

  1. A

    An interface includes function signatures, arguments, and return types.

  2. B

    Specification refers to the intended input-output behavior of the component.

  3. C

    Interface helps describe how a component is implemented internally.

  4. D

    A good specification language should balance abstraction and detail.

Show answer

Correct answers

  • A

    An interface includes function signatures, arguments, and return types.

  • B

    Specification refers to the intended input-output behavior of the component.

  • D

    A good specification language should balance abstraction and detail.

Question 12 on its own page

Question 13

+6 marksOne or more correct options

Which among the following statements is/are true about activation records?

Select all that apply.

  1. A

    Multiple activation records of the same function can exist on the stack during recursion.

  2. B

    Activation records created for functions are allocated in heap.

  3. C

    The return value link in an activation record identifies the memory location for storing the function’s return value.

  4. D

    The lifetime of a variable extends beyond the removal of its activation record from the stack.

Show answer

Correct answers

  • A

    Multiple activation records of the same function can exist on the stack during recursion.

  • C

    The return value link in an activation record identifies the memory location for storing the function’s return value.

Question 13 on its own page

Question 14

+7 marksOne or more correct options

Consider the Java code given below.

java
class Author {
    private String name;
    public Author(String na){
        name = na;
    }
    public String toString(){
        return "authored by " + name;
    }
}


class Book {
    private String title;
    private Author author;
    public Book(String t, Author a){
        title = t;
        author = a;
    }
    ***-----------------------***
       *  CODE SEGMENT HERE  *
    ***-----------------------***
}
public class Library {
    public static void main(String[] args){
        Author auth = new Author("R.K. Narayan");
        Book book = new Book("Malgudi Days", auth);
        System.out.println(book);
    }
}

Choose the correct option(s) to fill in the CODE SEGMENT so that the output is:

Malgudi Days authored by R.K. Narayan

Select all that apply.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answers

  • A
  • C
Question 14 on its own page

Question 15

+7 marksOne or more correct options

Consider the Java code given below.

java
class Doctor {
    protected int patientsTreated;
    protected static double consultationFee = 300;
    public Doctor(int p) {
        patientsTreated = p;
    }
    public final double calculateIncome() {
        return patientsTreated * consultationFee;
    }
}


class SpecialistDoctor extends Doctor {
    public SpecialistDoctor(int p) {
        super(p);
    }
    public final double calculateIncome() { // LINE 1
        return (patientsTreated * consultationFee) + 2000; // LINE 2
    }
}


public class Hospital {
    public static void main(String[] args) {
        Doctor d1 = new SpecialistDoctor(10); // LINE 3
        SpecialistDoctor sd1 = new Doctor(12); // LINE 4
        d1.calculateIncome();
        sd1.calculateIncome();
    }


 }

Which of the following statements are correct?

Select all that apply.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answers

  • A
  • D
Question 15 on its own page