Quiz for Classes and Objects

Q1: What is a class in Java?

A. A variable B. A data type C. A blueprint for objects D. A method

Q2: What is an object in Java?

A. A class definition B. A memory location C. An instance of a class D. A type of variable

Q3: Which keyword is used to create an object in Java?

A. create B. make C. object D. new

Q4: Which of the following is NOT a feature of OOP?

A. Encapsulation B. Inheritance C. Recursion D. Polymorphism

Q5: Which method is used as the entry point of a Java class?

A. start() B. run() C. main() D. init()

Q6: How many objects can be created from a single class?

A. Only one B. Unlimited C. Depends on JVM D. Fixed to 10

Q7: Which keyword is used to define a class in Java?

A. object B. structure C. class D. define

Q8: What does encapsulation mean in Java?

A. Hiding implementation details B. Using loops C. Using arrays D. Overriding methods

Q9: Which access modifier provides the highest level of access?

A. public B. private C. protected D. default

Q10: Which access modifier hides members from all other classes?

A. public B. private C. protected D. default

Q11: What is the default access modifier for a class in Java?

A. private B. protected C. default D. public

Q12: What is constructor overloading?

A. Using multiple classes B. Multiple constructors with different parameters C. Calling one constructor from another D. Inheritance of constructors

Q13: What is the name of a constructor?

A. init B. new C. Same as class D. object

Q14: Can a class have more than one constructor?

A. Yes B. No C. Only if it extends another class D. Only if public

Q15: What happens if no constructor is defined in a class?

A. Compilation error B. Object cannot be created C. Java provides a default constructor D. Only static methods work

Q16: Can constructors be overloaded in Java?

A. Yes B. No C. Only for static classes D. Only in abstract classes

Q17: Which keyword is used to refer to the current object?

A. this B. self C. object D. me

Q18: Which method is called when an object is created?

A. finalize() B. main() C. constructor D. toString()

Q19: Which keyword prevents inheritance?

A. private B. final C. static D. abstract

Q20: Which method is automatically called before garbage collection?

A. main() B. finalize() C. destroy() D. cleanup()