⏱️ Time: 2 Hours
📊 Maximum Marks: 50

Instructions:

• Attempt all questions.
• Write clean, properly indented Java code.
• Use meaningful variable and method names.
• Add comments wherever required.
• Follow proper OOP principles.

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🔹 Section A – Core Programming (30 Marks)

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Q1. Class, Object & Constructor (10 Marks)

A mobile shop wants to manage smartphone details.

👉 Write a Java program to:

1. Create a class Mobile with the following data members:
   • brand (String)
   • model (String)
   • price (double)
2. Create a parameterized constructor to initialize all values.
3. Create a method displayMobile() to print mobile details.
4. In the main() method:
   • Create at least 3 mobile objects
   • Display details of all mobiles

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Q2. Inheritance & Method Overriding (10 Marks)

A food delivery system calculates delivery charges differently.

👉 Write a Java program to:

1. Create a base class Delivery with:
   • Method calculateCharge() (default implementation)
2. Create two derived classes:
   • StandardDelivery
   • ExpressDelivery
3. Override calculateCharge() in both classes:
   • Standard → ₹50 flat
   • Express → ₹100 flat
4. In main():
   • Create objects of both types
   • Call the method and display charges

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Q3. Encapsulation (Getter/Setter) (10 Marks)

A hospital system needs to protect patient data.

👉 Write a Java program to:

1. Create a class Patient with:
   • Private variables: patientId, name, age
2. Provide:
   • Getter and Setter methods
   • Validation: age must be > 0
3. In main():
   • Set values using setters
   • Display patient details using getters

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🔹 Section B – Advanced OOP Concepts (20 Marks)

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Q4. Abstract Class (10 Marks)

A payment system supports different payment methods.

👉 Write a Java program to:

1. Create an abstract classPayment:
   • Abstract method pay(double amount)
2. Create subclasses:
   • CreditCardPayment
   • UPIPayment
3. Implement the method in both classes:
   • Print payment method and amount
4. In main():
   • Use reference of abstract class
   • Call methods for both payment types

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Q5. Polymorphism (Runtime / Dynamic Method Dispatch) (10 Marks)

A messaging system sends different types of messages.

👉 Write a Java program to:

1. Create a class Message:
   • Method send()
2. Create subclasses:
   • TextMessage
   • ImageMessage
3. Override send() method in both classes:
   • Display appropriate message type
4. In main():
   • Use parent class reference
   • Assign different child objects
   • Demonstrate runtime polymorphism

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⭐ Bonus Question (Optional – 5 Marks)

Q6. Exception Handling

👉 Write a Java program to:

1. Accept two numbers from user
2. Perform division
3. Handle:
   • Division by zero using try-catch
4. Display appropriate error message