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. Which function returns the next character from a file?

fgetchar()

fgetc()

readchar()

getchar()

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

NULL

EOF

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

puts()

fwrite()

fprintf()

fputs()

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

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

fwrite(file, 100);

print(file, 100);

fprint(file, 100);

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

"w"

"rw"

"r"

"a"

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

rename()

fileedit()

move()

change()

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

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

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

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

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

8. Which function is used to detect file errors?

errcheck()

checkerr()

fileerror()

ferror()

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

blockread()

fscanf()

readblock()

fread()

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

open()

fileopen()

fopen()

start()

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

Opens a file in append mode

Opens a file for reading

Opens a file in binary mode

Opens a file for writing and overwrites the file

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

file.h

conio.h

stdio.h

string.h

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

-1

NULL

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

getchar()

getc()

input()

getch()

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

fscanf()

fprintf()

fread()

fputs()

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

"w+"

"rb"

"a"

"r"

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

Program gives error

Data may not be written correctly

File is deleted

File closes automatically

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

rewind()

restart()

reset()

fseekstart()

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

File is created

File is opened for writing

File is created empty

fopen() returns NULL

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

NULL

EOF

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

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

Only for writing

Only in binary mode

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

NULL

-1

EOF

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

You cannot write to a file using C

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

File handling is only possible with user-defined functions

Files in C must always be text files

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

putc()

fwrite()

fprintf()

fputs()

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

fwrite()

putc()

fprintf()

fputs()

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

closefile()

remove()

fclose()

delete()

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

fclose()

endfile()

stop()

close()

28. What does the rb+ mode do?

Read and append binary file

Read-only binary file

Read and write text file

Read and write binary file

29. What does "a+" mode do?

Opens file for writing only

Opens file for reading only

Opens file for reading and writing; data is appended

Opens file for reading and writing; content is cleared

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

Read and write

Run

Read only

Rewrite

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

It stores only file names

It is used to print to console

It is not used in standard C

It keeps track of file pointer and buffer

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

ftell()

fseek()

fmove()

frewind()

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

fwrite()

fprintf()

fputs()

printf()

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

Depends on file size

-1

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

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

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

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

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

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

Opens in binary mode

Opens file for reading only

Deletes content and opens for reading and writing

Appends to existing file

37. Which function checks for file existence?

testfile()

fopen()

access()

filecheck()

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

eof()

isend()

endfile()

feof()

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

FILE

FILE *

void

int

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

It depends on the system

100

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

fscanf()

readf()

fread()

gets()

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

fread()

rewind()

ftell()

fseek()

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

"wb"

"w"

"rb"

"ab"

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

fclear()

fsave()

fflush()

clearfile()

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

fprintf()

puts()

fputs()

None

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

printb()

fwrite()

fprintb()

fprintf()

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

Binary file for appending

Binary file for reading

Text file

Binary file for writing

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

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

fwrite()

putch()

fput()

putc()

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

Writing

Reading

Checking file content

Using feof()

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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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