CUET Level - II Computer Science(7/11/2023)

Which of the following is a function/method of the pickle module?

• reader( )

• writer( )

• load ( )

• read( )

Answer explanation

Explanation: The load () method of python pickle module reads the pickled byte

stream of one or more python objects from a file object. When multiple objects

are expected from the byte steam, the load() method should be called multiple

times.

Which of the following statement is not correct?

• We can write content into a text file opened using ’w’ mode.

• We can write content into a text file opened using ‘w+’ mode.

• We can write content into a text file opened using ‘r ‘ mode.

• We can write content into a text file opened using ‘r+’ mode.

Answer explanation

opens the file in read-only mode. So, we can’t write any data to

the file.

3. Which of the following option is the correct Python statement to read and display the first 10 characters of a text file “ Notes.txt”?

• (a) F= open(‘Notes.txt’); print(F.load(10))

• F= open(‘Notes.txt’); print(F.dump(10))

• F= open(‘Notes.txt’); print(F.read(10))

• F= open(‘Notes.txt’); print(F.write(10))

Answer explanation

read() method in python is used to read at most n bytes from the

file associated with the given file descriptor. If the end of the file has been

reached while reading bytes from the given file descriptor, os.read() method will

return an empty bytes object for all bytes left to be read.

Which of the following is not a correct python statement to open a text file

“Notes.txt” to write content onto it?

• F= open(‘Notes.txt’, ‘w’)

• F= open(‘Notes.txt’, ‘a’)

• F= open(‘Notes.txt’, ‘A+’)

• F= open(‘Notes.txt’, ‘w’+)

Answer explanation

Option C is invalid because ‘A ‘ is an invalid mode in python.

‘w’ opens a file for write mode.

‘a’ opens a file for append mode.

‘w+’ opens a file for both writing and reading.

A text file opened using following statement:

MyFile= open(‘Notes.txt’)

Which of the following is the correct python statement to close it?

• MyFile= close(‘Notes.txt’)

• MyFile= close(‘Notes.txt’)

• Close.MyFile()

• MyFile.close()

Answer explanation

Python file method close() closes the opened file. Its syntax is

<file object>.close()

Which of the following option is the correct usage for the tell( ) of a file object?

• It places the file pointer at the desired offset in a file.

• It returns the entire content of a file.

• It returns the byte position of the file pointer as an integer.

• It tells the details about the file.

Answer explanation

tell() method can be used to get the position of File Handle. tell()

method returns current position of file object. This method takes no parameters

and returns an integer value. Initially file points to the beginning of the file (if not

opened in append mode).

Which of the following statement is incorrect in the context of pickled binary

file?

• csv module is used for reading and writing objects in binary files.

• pickle module is used for reading and writing objects in binary file.

• load () of the pickle module is used to rad objects.

• dump() of the pickle module is used to write objects.

Answer explanation

The csv module implements classes to rad and write tabular data in

CSV format. CSV files are text files so csv module can’t be used to read and write

objects to binary files.

What is the signification of the seek() method?

• It seeks the absolute path of the file.

• It tells the current byte position of the file pointer within the file.

• It places the file pointer at a desired offset within the file.

• It seeks the entire content of the file.

Answer explanation

In python, seek() function is used to change the position of the File

Handle to a given specific position. File handle is like a cursor, which defines

from where the data has to be read or written in the file. Syntax:

f.seek(offset,from_what), where f is file pointer.

Which of the following is the correct expansion of csv?

• Comma Separated Values

• Centrally Secured Values

• Computerised Secured Values

• Comma Secured Values.

Answer explanation

CSV (Comma Separated Values) is a simple file format used to store

tabular data, such as a spreadsheet or database. A CSV file stored tabular data

(numbers and text) in plain text. Each line of the file is a data record.

Which of the following is the default character for the newline parameter for

a csv file object opened in write mode in python IDLE?

• \n

• \t

• ,

• ;

Answer explanation

If newline=’ is not specified, newlines embedded inside quoted

fields will not be interpreted correctly, and on platforms that use \r\n line

endings on write an extra \r will be added. It should always be safe to specify

newline= “\n”, since the csv module does its own (universal) newline handling.