Computer File Handling in “C” Test Online

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Question 1

1. What does "w+" mode do to an existing file?

Answer

Appends to existing file

Answer

Opens in binary mode

Answer

Deletes content and opens for reading and writing

Answer

Opens file for reading only

Question 2

2. Which function moves the file pointer to a specific location?

Question 3

3. Which of the following is used to read a string from a file?

Question 4

4. Which function is used to open a file in C?

Answer

fileopen()

Question 5

5. Which standard library function is used to rename a file?

Answer

fileedit()

Question 6

6. What does "w" mode do in fopen()?

Answer

Opens a file for writing and overwrites the file

Answer

Opens a file in append mode

Answer

Opens a file in binary mode

Answer

Opens a file for reading

Question 7

7. Which function is used to write a string to a file?

Question 8

8. Which function is used to detect file errors?

Answer

checkerr()

Answer

fileerror()

Answer

errcheck()

Question 9

9. Which function returns the current position of the file pointer?

Question 10

10. Which mode is used to append data to a file?

Question 11

11. What is the role of the FILE structure in C?

Answer

It keeps track of file pointer and buffer

Answer

It is used to print to console

Answer

It stores only file names

Answer

It is not used in standard C

Question 12

12. Which function is used to write a character to a file?

Question 13

13. In which file mode will the data be written at the end of the file?

Question 14

14. Which of the following is used to write binary data to a file?

Question 15

15. Which of the following modes allows both reading and writing?

Question 16

16. Which of the following functions writes formatted data to a binary file?

Question 17

17. Which function is used to read formatted data from a file?

Question 18

18. Which of the following will create a new text file or overwrite if it already exists?

Answer

fopen("file.txt", "r")

Answer

fopen("file.txt", "r+")

Answer

fopen("file.txt", "a")

Answer

fopen("file.txt", "w")

Question 19

19. Which function checks for file existence?

Answer

testfile()

Answer

filecheck()

Question 20

20. Which of the following functions is used to write a string with a newline?

Question 21

21. Which of the following statements is true about file handling in C?

Answer

You cannot write to a file using C

Answer

You can read, write, and append using specific file modes

Answer

File handling is only possible with user-defined functions

Answer

Files in C must always be text files

Question 22

22. What is the output of ftell() after opening a file in read mode?

Answer

Depends on file size

Question 23

23. What type of file does "rb" open?

Answer

Binary file for reading

Answer

Binary file for writing

Answer

Binary file for appending

Question 24

24. What is the maximum number of files that can be open simultaneously in C?

Answer

It depends on the system

Question 25

25. Which of the following functions is used to flush the output buffer?

Answer

clearfile()

Question 26

26. Which of the following is used to write formatted output to a file?

Question 27

27. What will fread() return if it fails?

Question 28

28. Which function is used to check the end-of-file condition?

Question 29

29. What does "a+" mode do?

Answer

Opens file for reading only

Answer

Opens file for reading and writing; data is appended

Answer

Opens file for writing only

Answer

Opens file for reading and writing; content is cleared

Question 30

30. Which of the following is used to read a character from a file?

Question 31

31. Which function is used to close a file in C?

Question 32

32. Which mode in fopen() creates a new binary file for writing?

Question 33

33. What does the rb+ mode do?

Answer

Read and append binary file

Answer

Read-only binary file

Answer

Read and write text file

Answer

Read and write binary file

Question 34

34. What is the return value of fclose() on success?

Question 35

35. Which function returns the next character from a file?

Answer

fgetchar()

Answer

readchar()

Question 36

36. What happens when fclose() is not called?

Answer

File closes automatically

Answer

File is deleted

Answer

Data may not be written correctly

Answer

Program gives error

Question 37

37. What does ferror() return if no error occurs?

Question 38

38. Which of the following operations is not possible in "r" mode?

Answer

Using feof()

Answer

Checking file content

Question 39

39. Which header file is required for file operations in C?

Question 40

40. Which function moves the file pointer back to the beginning of a file?

Answer

fseekstart()

Question 41

41. What is the return type of fopen()?

Question 42

42. What will fopen() return if it fails to open a file?

Question 43

43. Which function is used to read a block of data from a file?

Answer

blockread()

Answer

readblock()

Question 44

44. Which function can be used to remove a file?

Answer

closefile()

Question 45

45. Which of the following is correct for writing formatted data to a file?

Answer

fprintf(file, "%d", 100);

Answer

print(file, 100);

Answer

fprint(file, 100);

Answer

fwrite(file, 100);

Question 46

46. What does the mode "r" in fopen() stand for?

Answer

Read and write

Question 47

47. What happens if fopen() is called with "r" mode on a non-existent file?

Answer

fopen() returns NULL

Answer

File is created

Answer

File is opened for writing

Answer

File is created empty

Question 48

48. Which of the following is a correct way to create and write to a binary file?

Answer

fopen("file.txt", "rb")

Answer

fopen("file.txt", "r")

Answer

fopen("file.txt", "wb")

Answer

fopen("file.txt", "ab")

Question 49

49. Can a file be opened for both reading and writing?

Answer

Only for writing

Answer

Only in binary mode

Answer

Yes, using "r+" or "w+"

Question 50

50. Which of the following can be used to store structured data in files?

Question 51

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Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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