Tata Infotech 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 will be the initial capacity of an ArrayList if it is created with the no-argument constructor?

   A: 0

   B: 5

   C: 10

   D: 16

   Ans: C

7. What does a Set guarantee?

   A: Order

   B: No duplicates

   C: Both

   D: None of the above

   Ans: B

8. Which List implementation is synchronized?

   A: ArrayList

   B: Vector

   C: LinkedList

   D: None of the above

   Ans: B

9. What does the transient keyword indicate in a Java class?

   A: The variable can change over time

   B: The variable cannot be serialized

   C: The variable is thread-safe

   D: The variable is volatile

   Ans: B

10. Which of these is a checked exception?

    A: NullPointerException

    B: ArithmeticException

    C: IOException

    D: IndexOutOfBoundsException

    Ans: C

11. Which interface represents a key-value pair mechanism?

    A: List

    B: Set

    C: Queue

    D: Map

    Ans: D