TATA ELXSI Previous Years Solved Sample Placement Papers

1. What does the join() method do when called on a thread object?

   A: Terminates the thread

   B: Pauses the thread

   C: Forces the current executing thread to wait until the thread it's called on completes

   D: Checks the status of a thread

   Ans: C

2. Which method can be used to momentarily pause the execution of the current thread?

   A: sleep()

   B: wait()

   C: pause()

   D: stop()

   Ans: A

3. Which interface provides an alternative to extending the Thread class?

   A: Runnable

   B: Callable

   C: Executor

   D: Parallel

   Ans: A

4. What is a daemon thread in Java?

   A: A thread that monitors and logs other threads

   B: A thread that runs continuously in the background

   C: A thread that manages memory usage

   D: A thread that is part of the Java virtual machine

   Ans: B

5. Which interface represents a collection of objects in which duplicate values can be stored?

   A: List

   B: Set

   C: Map

   D: ListMap

   Ans: A

6. What is the purpose of the "super" keyword in Java?

   A: To refer to the current object

   B: To invoke the superclass constructor or methods

   C: To create multiple instances of a class

   D: To hide data and methods within a class

   Ans: B

7. What is the purpose of the "this" keyword in Java?

   A: To refer to the superclass

   B: To create multiple instances of a class

   C: To hide data and methods within a class

   D: To refer to the current object

   Ans: D

8. What is the purpose of the "final" keyword in Java?

   A: To prevent the inheritance of a class

   B: To prevent overriding of a method

   C: To prevent modification of a variable's value

   D: All of the above

   Ans: D

9. Can an interface method be declared as final?

   A: Yes

   B: No

   Ans: B

10. In Java 9, which type of methods can be added to interfaces to share code between methods?

    A: Static

    B: Private

    C: Final

    D: Protected

    Ans: B

11. An interface with no methods is known as?

    A: Abstract Interface

    B: Marker Interface

    C: Empty Interface

    D: Functional Interface

    Ans: B

12. Which keyword is used to define a default method in an interface?

    A: static

    B: default

    C: final

    D: abstract

    Ans: B

13. Are all methods in an interface abstract?

    A: Yes

    B: No

    Ans: B