Computer File Handling in “C” Test Online

Mustansar KhanLast Updated: October 15, 2025

Important Computer File Handling in “C” Question and Answer

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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File Handling in “C” Practice Test Online With Explanation

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

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

100

It depends on the system

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

fgetc()

readchar()

fgetchar()

getchar()

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

close()

endfile()

fclose()

stop()

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

Only for writing

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

Only in binary mode

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

File is deleted

Program gives error

Data may not be written correctly

File closes automatically

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

stdio.h

file.h

conio.h

string.h

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

EOF

NULL

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

rewind()

fseek()

fread()

ftell()

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

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

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

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

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

11. Which function checks for file existence?

fopen()

filecheck()

testfile()

access()

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

"r"

"w+"

"rb"

"a"

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

Rewrite

Run

Read and write

Read only

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

Files in C must always be text files

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

File handling is only possible with user-defined functions

You cannot write to a file using C

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

fclear()

fflush()

fsave()

clearfile()

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

fwrite()

printf()

fprintf()

fputs()

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

-1

NULL

18. Which function is used to detect file errors?

fileerror()

errcheck()

checkerr()

ferror()

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

fwrite()

puts()

fputs()

fprintf()

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

reset()

restart()

fseekstart()

rewind()

21. What does "a+" mode do?

Opens file for reading and writing; content is cleared

Opens file for reading and writing; data is appended

Opens file for reading only

Opens file for writing only

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

putc()

fwrite()

fputs()

fprintf()

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

putc()

fput()

fwrite()

putch()

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

fprintf()

fread()

fscanf()

fputs()

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

None

fputs()

puts()

fprintf()

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

"r"

"w"

"rw"

"a"

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

"rb"

"wb"

"ab"

"w"

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

feof()

endfile()

eof()

isend()

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

fread()

fscanf()

gets()

readf()

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

EOF

NULL

-1

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

remove()

closefile()

delete()

fclose()

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

File is created

File is opened for writing

fopen() returns NULL

File is created empty

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

fprintb()

printb()

fprintf()

fwrite()

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

fmove()

fseek()

frewind()

ftell()

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

Text file

Binary file for writing

Binary file for appending

Binary file for reading

36. What does the rb+ mode do?

Read and write text file

Read and append binary file

Read and write binary file

Read-only binary file

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

fscanf()

readblock()

blockread()

fread()

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

FILE *

void

FILE

int

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

input()

getc()

getchar()

getch()

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

fprintf()

putc()

fputs()

fwrite()

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

Opens file for reading only

Deletes content and opens for reading and writing

Opens in binary mode

Appends to existing file

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

Opens a file in binary mode

Opens a file in append mode

Opens a file for writing and overwrites the file

Opens a file for reading

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

-1

Depends on file size

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

change()

move()

fileedit()

rename()

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

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

print(file, 100);

fwrite(file, 100);

fprint(file, 100);

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

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

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

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

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

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

It stores only file names

It is not used in standard C

It keeps track of file pointer and buffer

It is used to print to console

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

open()

fileopen()

fopen()

start()

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

NULL

EOF

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

Reading

Using feof()

Checking file content

Writing

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Mustansar KhanLast Updated: October 15, 2025

Important Computer File Handling in “C” Question and Answer

File Handling in “C” Practice Test Online With Explanation

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