TATA ELXSI Previous Years Solved Sample Placement Papers

1. What is an interface in Java?

   A: A class

   B: A data type

   C: A blueprint for a class

   D: A data structure

   Ans: C

2. Which keyword is used to implement an interface?

   A: extends

   B: new

   C: interface

   D: implements

   Ans: D

3. Can an interface extend another interface in Java?

   A: No

   B: Yes

   Ans: B

4. Can an interface have a constructor?

   A: Yes

   B: No

   Ans: B

5. Which of the following access modifiers are implicitly applied to variables in an interface?

   A: private

   B: protected

   C: public

   D: default

   Ans: C

6. Is it possible to create an instance of an interface?

   A: Yes

   B: No

   Ans: B

7. How many interfaces can a Java class implement?

   A: None

   B: Only one

   C: Two

   D: As many as needed

   Ans: D

8. Can an interface inherit from a class?

   A: Yes

   B: No

   Ans: B

9. Which of the following can be used to create a custom checked exception?

   A: Extending the Exception class

   B: Extending the Error class

   C: Extending the RuntimeException class

   D: None of the above

   Ans: A

10. Which of these is an unchecked exception?

    A: ClassNotFoundException

    B: SQLException

    C: IOException

    D: ArithmeticException

    Ans: D

11. Which keyword is used to manually throw an exception in Java?

    A: new

    B: throw

    C: throws

    D: Throwable

    Ans: B

12. Which of these classes is the superclass of all Exception and Error classes?

    A: Exception

    B: Error

    C: Throwable

    D: Object

    Ans: C

13. What does the finally block do?

    A: Catches any exception

    B: Executes whether an exception is thrown or not

    C: Executes only when an exception is thrown

    D: Executes only when an exception is not thrown

    Ans: B

14. Which keyword in Java is used for constant variables?

    A: const

    B: static

    C: constant

    D: final

    Ans: D

15. In Java, what is the primary purpose of the Thread class?

    A: File handling

    B: String operations

    C: Network operations

    D: Creating and executing threads

    Ans: D

16. Which method is used to start the execution of a thread?

    A: run()

    B: start()

    C: execute()

    D: go()

    Ans: B