Interview Questions

1. Which of the following is true about threads?

Options:

a. Threads are similar to processes, but differ in the way that they share resources.

b. Threads consumes less processor time.

c. Threads are different from processes.

d. Thread execution is scheduled more frequently.

Reveal Answer

2. How to set thread to highest priority?

Options:

a. ThreadPriority.AboveNormal.

b. ThreadPriority.High.

c. ThreadPriority.Normal.

d. ThreadPriority.Highest.

Reveal Answer

3. What is the output of the following program? class ThreadNaming { static void Main() { Thread.CurrentThread.Name = "main"; Thread worker = new Thread (Go); worker.Name = "worker"; worker.Start(); Go(); } static void Go() { Console.WriteLine ("Hello from " + Thread.CurrentThread.Name); } }

Options:

a. Hello from Main Method

b. Hello from Main Hello from Worker.

c. Hello from Worker

d. Hello from Worker Hello from Main

Reveal Answer

4. Types of scheduling ____________

Options:

a. Preemptive

b. Non-Premptive

c. Preemptive and Non-Premptive

d. None

Reveal Answer

5. In _____________ scheduling, OS can unschedule a thread even if it did not complete its task.

Options:

a. Preemptive

b. Non-preemptive

c. Primitive

d. Non-primitive.

Reveal Answer

6. If multiple threads exist with same priority then a __________ is assigned to each thread.

Options:

a. slice

b. time pulse

c. pulse

d. time slice

Reveal Answer

7. A thread is waiting for processor to be allocated to it in __________ state.

Options:

a. Running

b. Suspended

c. Blocked

d. Ready

Reveal Answer

8. After the execution of all the instructions in the thread it goes to __________state.

Options:

a. Running

b. Suspended

c. Blocked

d. Dead

Reveal Answer

9. A thread is said to be in ___________ state when the resources are not available to it and it is waiting for them.

Options:

a. Sleeping

b. Suspended

c. Blocked

d. Dead

Reveal Answer

10. In .Net every thread has two objects associated with it. Custom object and object of type _____________ .

Options:

a. System.Threads

b. System.Threading

c. System.Threading.Thread

d. Threading.Threads

Reveal Answer

11. _______________________ is responsible for managing the lifetime and the states of the thread.

Options:

a. A Custom object

b. Object of type System.Threading.Thread

c. Can't say

d. Depends on the context

Reveal Answer

12. The process terminates when the __________ terminates

Options:

a. Main thread

b. Process

c. Application

d. Non-background thread

Reveal Answer

13. If a thread executes ____________ the current thread state is changed to waiting and it remains in that state until the thread referred by "t" is terminated.

Options:

a. t.Join()

b. Join(3000)

c. t.IsAlive()

d. t.Abort

Reveal Answer

14. ___________ to check whether the thread is dead or alive.

Options:

a. t.Join()

b. Join(3000)

c. t.IsAlive

d. t.Abort

Reveal Answer

15. _____________________ is a block of code which can be executed by only one thread at any given instance of time.

Options:

a. Critical section

b. Main section

c. Function

d. Structure

Reveal Answer

16. ___________________ is a class whose objects state is not desynchronized when it is being used by more than one thread at the same time.

Options:

a. Thread class

b. safe class

c. Thread safe class

d. Thread unsafe class

Reveal Answer

17. Locking _________ throughput.

Options:

a. improves

b. degrades

c. depends on the context

d. can't say

Reveal Answer

18. Shared/Static members of a class can synchronize the code in them by acquiring the lock on ___________ instance of that class.

Options:

a. Type

b. class

c. method

d. None

Reveal Answer

19. ___________________ is a synchronized resource managed by the OS.

Options:

a. None

b. Semaphore

c. Mutex and semaphore

d. Mutex

Reveal Answer

20. _______________ is used for synchronizing threads

Options:

a. Mutex

b. Semaphore

c. Mutex and semaphore

d. None

Reveal Answer

21. The path of execution of instructions within a process is called a ___________

Options:

a. Sub Process

b. Thread

c. Application

Reveal Answer

22. Thread is used for:

Options:

a. To perform background tasks

b. Handle simultaneous streams of input

c. Maximum usage of multiprocessor environment

d. All the above

Reveal Answer

23. What is Thread Pool?

Options:

a. It is a collection of threads to perform several tasks.

b. used For testing threads connection .

c. It is a collection of thread connection string

d. It is the array of Thread objects created by user.

Reveal Answer

24. How many types of wait handles are there?

Options:

a. 2

b. 3

c. 4

Reveal Answer

25. What is a WaitHandle?

Options:

a. It is a base class for synchronization of objects

b. It encapsulates the objects for shared objects

c. It suspends current running thread.

d. It stops current thread.

Reveal Answer

26. Which of the following methods can be used to avoid deadlock in threading?

Options:

a. Monitor

b. Wait Handles

c. Using ThreadState

d. All the above

Reveal Answer

27. Difference between thread and process?

Options:

a. Both are same

b. Thread is a path of execution and process is a collection of threads

c. Process is a path of execution and thread is a collection of threads

d. Process is a part of thread.

Reveal Answer

28. What is a Foreground Thread?

Options:

a. It keeps the application alive

b. Closes the application as soon as this is closed

c. It is a thread that sleeps for every 1000milliseconds

d. None of the above

Reveal Answer

29. What is a Background Thread?

Options:

a. It keeps the application alive

b. Does not keep the application alive and terminate when all foreground threads are closed

c. It is a thread that sleeps for every 1000milliseconds

d. None of the above

Reveal Answer

30. What is multitasking?

Options:

a. It is running multiple programs at the same time.

b. Performing intense calculations

c. Running programs on different computers

Reveal Answer

31. Is it possible to run multiple threads in a single app domain?

Options:

a. Yes

b. No

Reveal Answer

32. Which of the following methods is the right way to change the thread’s priority?

Options:

a. Threadname.Priority(ThreadPriority.Highest)

b. Threadname.Priority = ThreadPriority.Highest

c. Threadname.PriorityState = ThreadPriority.Highest

d. Threadname.PriorityState(ThreadPriority.Highest)

Reveal Answer

33. How to make a thread to sleep for infinite period and to interrupt such a thread?

Options:

a. Using System.Threading.Timeout.Infinite and use Thread.Start

b. Using System.Threading.Timeout.Infinite and use Thread.Interrupt

c. Using System.Threading.Sleep(MaxTime) and use Thread.Start

d. Using System.Threading.Sleep(MaxTime) and use Thread.Interrupt

Reveal Answer

34. What is Thread.Join()?

Options:

a. Used to run two threads simultaneously

b. To stop an earlier thread

c. This is used to make sure an earlier task on a different thread has completed the execution.

d. None of the above

Reveal Answer

35. Can events be used in Threads?

Options:

a. Yes

b. No

Reveal Answer

36. What is a Monitor object?

Options:

a. It helps in faster execution

b. Allows multiple entry points for all threads

c. Used to ensure a block of code to run uninterrupted.

d. None of the above

Reveal Answer

37. How to debug a thread?

Options:

a. Output Window

b. Debug thread window

c. Immediate window

Reveal Answer

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