Commerce (English Medium) Class 12 - CBSE Question Bank Solutions for Computer Science (Python)

Janish Khanna used a pen drive to copy files from his friend's laptop to his office computer. Soon his computer started abnormal functioning. Sometimes it would restart by itself and sometimes it would stop different applications running on it. Which of the following options out ·of (i) to (iv), would have caused the malfunctioning of the computer? Justify the reason for your chosen option:

1) Computer Virus

2)Spain Mail

3) Computer Bacteria

4) Trojan Horse

What is Trojan Horse?

Identify data required to be maintained to perform the following service:

Declare exam results and print e-certificates.

Identify data required to be maintained to perform the following service:

Register participants in an exhibition and issue biometric ID cards.

Identify data required to be maintained to perform the following service:

To search for an image by a search engine.

Identify data required to be maintained to perform the following service:

To book an OPD appointment with a hospital in a specific department.

Give the term for the following:

Collection of logically related records.

Define RDBMS. Name any two RDBMS software.

What do you understand by the term network?

Which of the following is an invalid datatype in Python?

Which of the following operators will return either True or False?

“Every syntax error is an exception but every exception cannot be a syntax error.” Justify the statement.

Differentiate between text file and binary file.

Write the file mode that will be used for opening the following file. Also, write the Python statement to open the following file:

a text file “example.txt” in both read and write mode

Write the file mode that will be used for opening the following file. Also, write the Python statement to open the following file:

a binary file “bfile.dat” in write mode.

Write the file mode that will be used for opening the following file. Also, write the Python statement to open the following file:

a text file “try.txt” in append and read mode.

Write the file mode that will be used for opening the following file. Also, write the Python statement to open the following file:

a binary file “btry.dat” in read only mode.

Write a program to enter the following records in a binary file:

Number of records to be entered should be accepted from the user. Read the file to display the records in the following format:

Item No:
Item Name :
Quantity:
Price per item:
Amount: (to be calculated as Price * Qty)

Consider a list of 10 elements:

numList = [7, 11, 3, 10, 17, 23, 1, 4, 21, 5].

Display the partially sorted list after three complete passes of Bubble sort.

Identify the number of swaps required for sorting the following list using selection sort and bubble sort and identify which is the better sorting technique with respect to the number of comparisons.

List 1: