Interview Questions

1. The number of bytes a character takes is decided by the type of ________________

Options:

a. decoding

b. encoding

c. size

d. range

Reveal Answer

2. The unit of a data in a stream of Binary is ___________

Options:

a. not fixed

b. fixed

c. depends on stream

d. can't say

Reveal Answer

3. ________________ is inherited from stream.

Options:

a. File stream

b. Memory stream

c. Buffered stream

d. all the above

Reveal Answer

4. Stream and its inherited classes provide us data in the form of _____________

Options:

a. Integers

b. Characters

c. Bytes

d. Bits

Reveal Answer

5. _________________ is used to read from, write to, and manipulate file-related operations.

Options:

a. File stream

b. Text stream

c. Binary stream

d. Basic stream

Reveal Answer

6. ____________method is used to support random access to files in file stream objects

Options:

a. Seek

b. Push

c. Pop

d. Ask

e. Read

Reveal Answer

7. ______________ is a non-buffered stream whose encapsulated data is directly accessible in memory

Options:

a. File stream

b. text stream

c. binary stream

d. Memory stream

Reveal Answer

8. ________________ has no backing store and might be useful as a temporary buffer.

Options:

a. Memory stream

b. File stream

c. binary stream

d. text stream

Reveal Answer

9. A __________________ is a stream that adds buffering to another stream such as a network stream.

Options:

a. File stream

b. Binary stream

c. Buffered stream

d. Memory stream

Reveal Answer

10. A _________ can be composed around some types of streams in order to improve read and write performance

Options:

a. Memory stream

b. File stream

c. Buffered stream

d. binary stream

Reveal Answer

11. _______________ has buffering internally

Options:

a. Binary stream

b. Buffered stream

c. Memory stream

d. File stream

Reveal Answer

12. _________ does not need buffering

Options:

a. File stream

b. Buffered stream

c. binary stream

d. Memory stream

Reveal Answer

13. For reading a text file, the file stream object must be _____________ by stream reader object.

Options:

a. inherited

b. encapsulated

c. polymorphised

d. none

Reveal Answer

14. The write method is ____________ for all the basic data types.

Options:

a. overloaded

b. inherited

c. encapsulated

d. none

Reveal Answer

15. ____________________ is a process in which the objects state can be converted to a form in which it can be either persisted or transported

Options:

a. Serialization

b. Specialization

c. Formalization

d. none

Reveal Answer

16. In __________ serialization only the public instance members of a public class can be serialized.

Options:

a. Binary

b. XML

c. both a and b

d. none

Reveal Answer

17. What is a Stream?

Options:

a. It is the abstract base class of all streams

b. It is used to read/write data

c. None of the above

d. Both a and b

Reveal Answer

18. The different types of streams that are available in .net:

Options:

a. Reader Stream, DisplayStream

b. Basic Stream, Text Stream, Binary Stream

c. Display Stream, Writer Stream

d. None of the above

Reveal Answer

19. What are the classes available in System.IO namespace? i. FileStream ii. BufferedStream iii. StreamWriter iv. StringReader

Options:

a. i, ii

b. ii, iii

c. i, ii, iv

d. All the above

Reveal Answer

20. What does a Flush method in Stream class do?

Options:

a. Clears writer stream

b. Clears the underlying buffer

c. It is used to clear memory for variables

d. None of the above

Reveal Answer

21. What is the use of Stream.Write Method

Options:

a. Writes a sequence of bytes to current stream

b. Advances the position of the pointer to the number of bytes read

c. Has offset property to locate the position to start copying

d. All the above

Reveal Answer

22. What does a StreamWriter class implement

Options:

a. TextReader

b. TextWriter

c. StringWriter

d. StringReader

Reveal Answer

23. Using StringReader, the characters can be from:

Options:

a. Streams

b. Collections

c. Strings

d. None

Reveal Answer

24. What is the difference between Directory and DirectoryInfo?

Options:

a. Directory exposes static methods & DirectoryInfo exposes instance methods

b. DirectoryInfo exposes static methods & Directory exposes instance methods

c. Both are the same

d. None of the above

Reveal Answer

25. IOException is thrown when accessing information using: i. Files ii. Streams iii. Directories

Options:

a. i, ii

b. ii, iii

c. All the above

Reveal Answer

26. How to read text from a text file? i. ReadAllBytes ii. ReadAllLines iii. ReadAllText iv. OpenText

Options:

a. i, ii

b. i, iii

c. ii, iii

d. All the above

Reveal Answer

27. How to retrieve or set the current position in a stream?

Options:

a. Position

b. Seek

c. Read

d. Write

Reveal Answer

28. What is the function of Stream.CopyTo method?

Options:

a. Reads from current stream and writes to destination stream

b. Reads from destination stream and writes to current stream

c. This is used to copy from localvariables to another variable

d. None of the above

Reveal Answer

29. What are the standard I/O streams?

Options:

a. Console.In

b. Console.Out

c. Console.Error

d. All the above

Reveal Answer

30. What are types of serialization?

Options:

a. Binary Serialization

b. XML Serialization

c. String Serialization

d. A & B

e. A& C

Reveal Answer

31. Select the namespace on which the stream classes are defined?

Options:

a. System.IO

b. System.Input

c. System.Output

d. All of the mentioned

Reveal Answer

32. Choose the class on which all stream classes are defined?

Options:

a. System.IO.stream

b. Sytem.Input.stream

c. System.Output.stream

d. All of the mentioned

Reveal Answer

33. Choose the stream class method which is used to close the connection:

Options:

a. close()

b. static close()

c. void close()

d. none of the mentioned

Reveal Answer

34. The method used to write a single byte to an output stream?

Options:

a. void WriteByte(byte value)

b. int Write(byte[] buffer ,int offset ,int count)

c. write()

d. None of the mentioned

Reveal Answer

35. Select the method which writes the contents of the stream to the physical device.

Options:

a. fflush()

b. void fflush()

c. void Flush()

d. flush()

Reveal Answer

36. Select the method which returns the number of bytes from the array buffer:

Options:

a. void WriteByte(byte value)

b. int Write(byte[] buffer ,int offset ,int count)

c. write()

d. None of the mentioned

Reveal Answer

37. Name the method which returns integer as 1 when the end of file is encountered.

Options:

a. int read()

b. int ReadByte()

c. void readbyte()

d. None of the mentioned

Reveal Answer

38. Select the statements which define the stream.

Options:

a. A stream is an abstraction that produces or consumes information

b. A stream is linked to a physical device by the I/0 system

c. C# programs perform I/O through streams

d. All of the mentioned

Reveal Answer

39. Select the action of the method long seek()?

Options:

a. Attempts to readup to count bytes into buffer starting at buffer[offset]

b. Writes a single byte to an output stream

c. Sets the current position in the stream to the specified offset from specified origin and hence returns the new position

d. None of the mentioned

Reveal Answer

40. Which among the following attempts to read up to count bytes into buffer starting at buffer[offset], returning the number of bytes successfully read?

Options:

a. int ReadByte()

b. int Read(byte[] buffer ,int offset ,int count)

c. Void WriteByte(byte value)

d. None of the mentioned

Reveal Answer

41. Which property among the following represents the current position of the stream?

Options:

a. long Length

b. long Position

c. int Length

d. All of the mentioned

Reveal Answer

42. Choose the filemode method which is used to create a new output file with the condition that the file with same name if exists will destroy the old file:

Options:

a. FileMode.CreateNew

b. FileMode.Create

c. FileMode.OpenOrCreate

d. FileMode.Truncate

Reveal Answer

43. Which of these is a method used to clear all the data present in output buffers?

Options:

a. clear()

b. flush()

c. fflush()

d. close()

Reveal Answer

44. From which of these classes, the character based output stream class Stream Writer is derived?

Options:

a. TextWriter

b. TextReader

c. Character Stream

d. All of the mentioned

Reveal Answer

45. The advantages of using character stream based file handling are?

Options:

a. they operate directly on unicode characters

b. they operate directly on bits

c. If desired, they store unicode text

d. all of the mentioned

Reveal Answer

46. Which among the following classes are used to perform the character based file operations?

Options:

a. StreamReader

b. StreamWriter

c. InputStream

d. OutputStream

Reveal Answer

47. Choose the output for the given set of code: static void Main(string[] args) { int a = 10, b = 0; int result; Console.Out.WriteLine("This will generate an exception."); try { result = a / b; // generate an exception } catch (DivideByZeroException exc) { Console.Error.WriteLine(exc.Message); } Console.ReadLine(); }

Options:

a. This will generate an exception

b. 0

c. Compile time error

d. This will generate an exception: Attempted to Divide by Zero

Reveal Answer

48. Choose the methods provided by Console.Out and Console.Error?

Options:

a. Write, WriteKey

b. WriteLine, WriteKey

c. Write, WriteLine, WriteKey

d. Write, WriteLine

Reveal Answer

49. In the given constructor declaration for character based file operation what does ‘path’ and ‘bool specifies? StreamWriter(string path, bool append)

Options:

a. the name of the file to open

b. specifies the full path of file

c. if append is true, the file is appended to the end of the existing file

d. None of the mentioned

Reveal Answer

50. Which of the class provides the operation of reading from and writing to the console in C#.NET?

Options:

a. System.Array

b. System.Output

c. System.ReadLine

d. System.Console

Reveal Answer

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