Which of the following represents mode of both writing and reading in binary format in file. ?

1. wb+
2. w
3. wb
4. w+

Which of the following is not a valid mode to open a file ?

1. ab
2. rw
3. r+
4. w+

Which of the following command is used to open a file "c:\pat.txt" in read-mode only ?

1. fin = open("c:\pat.txt", "r")
2. fin = open("c:\\pat.txt", "r")
3. fin = open(file = "c:\pat.txt", "r+")
4. fin = open(file = "c:\\pat.txt", "r+")

Which of the following statements are true regarding the opening modes of a file ?

1. When you open a file for reading, if the file does not exist, an error occurs.
2. When you open a file for writing, if the file does not exist, an error occurs.
3. When you open a file for reading, if the file does not exist, the program will open an empty file.
4. When you open a file for writing, if the file does not exist, a new file is created.
5. When you open a file for writing, if the file exists, the existing file is overwritten with the new file.