OOP Quiz for Level 2 Undergraduates

What is the main purpose of encapsulation?

• Code duplication

• Hiding internal details

• Increasing complexity

• Public access to variables

Which of the following allows runtime polymorphism in Java?

• Method Overloading

• Constructor Overloading

• Method Overriding

• Final methods

What keyword is used to inherit a class in Java?

• import

• extend

• this

• implements

What will be the output of: System.out.println(10 > 5 && 3 < 2);

• true

• false

• 10

• Compile error

Which access modifier allows access only within the same class?

• public

• protected

• private

• default

What is abstraction in OOP?

• Hiding data

• Hiding logic

• Hiding implementation details and showing only functionality

• Hiding methods

Which statement is used to catch exceptions?

• try-catch

• throw

• throws

• if-else

What is the result of x = (5 > 3) ? 10 : 20;

• 3

• 5

• 10

• 20

Which operator is used to compare values in Java?

• =

• ==

• :=

• equals

What happens if a subclass does not override an abstract method?

• It compiles and runs

• Compile-time error

• Runtime error

• Warning only