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

Among LAN, MAN, and WAN, which has the highest speed, and which one can cover the largest area?

18 Gbps is equal to how many Bits per second?

Write a short note on the following:

Bandwidth

Write a short note on the following:

Data transfer rate

A composite signal contains frequencies between 500 MHz and 1GHz. What is the bandwidth of a signal?

Write a short note on different methods of malware identification used by antivirus software.

Differentiate between CHAR and VARCHAR data types in SQL with appropriate examples.

In a table in the MYSQL database, an attribute A of datatype varchar(20) has the value “Keshav”. The attribute B of datatype char(20) has the value “Meenakshi”. How many characters are occupied by attribute A and attribute B?

An exception may be raised even if the program is syntactically correct.

Kabir wants to write a program in Python to insert the following record in the table named Student in MYSQL database,

SCHOOL:

• rno(Roll number) - integer
• name(Name) - string
• DOB (Date of birth) - Date
• Fee - float

Note the following to establish connectivity between Python and MySQL:

• Username - root
• Password - tiger
• Host - localhost

The values of fields rno, name, DOB and fee has to be accepted from the user. Help Kabir to write the program in Python.

Define the term bandwidth with respect to networks.

Zack is working in a database named SPORT, in which he has created a table named “Sports” containing columns SportId, SportName, no_of_players, and category.

After creating the table, he realized that the attribute, category has to be deleted from the table and a new attribute TypeSport of data type string has to be added. This attribute TypeSport cannot be left blank. Help Zack write the commands to complete both the tasks.

Sartaj has created a table named Student in MYSQL database, SCHOOL:

• rno(Roll number )- integer
• name(Name) - string
• DOB (Date of birth) – Date
• Fee – float

Note the following to establish connectivity between Python and MySQL:

• Username - root
• Password - tiger
• Host - localhost

Sartaj, now wants to display the records of students whose fee is more than 5000. Help Sartaj to write the program in Python.

Hi-Standard Tech Traj.ning Ltd. is a Mumbai based organization which is expanding its office set-up to Chennai. At Chennai office compound, they are planning to have 3 different blocks for Admin, Training and Accounts related activities. Each block has a number of computers, which are required to be connected in a network for communication, data and resource sharing.

As a network consultant, you have to suggest the best network related solutions for them for issues/problems raised by them in (i) to (iv), as per the distances between various blocks/locations and other given parameters.

Shortest differences between various blocks/locations:

The number of computers installed at various blocks is as follows:

1) Suggest the most appropriate block/location to house the SERVER in the CHENNAI office (out of the 3 blocks) to get the best and effective connectivity. Justify your answer.

2) Suggest the best-wired medium and draw the cable layout (Block to Block) to efficiently connect various blocks within the CHENNAI office compound.

3) Suggest a device/software and its placement that would provide data security for the entire network of the CHENNAI office.

4) Suggest a device and the protocol that shall be needed to provide wireless Internet access to all smartphone/laptop users in the CHENNAI office

What kind of data gets stored in cookies and how is it useful ?

Differentiate between packet switching over message switching

When are the following built-in exceptions raised? Give examples to support your answer.

ImportError

When are the following built-in exceptions raised? Give examples to support your answer.

IOError

When are the following built-in exceptions raised? Give examples to support your answer.

NameError

When are the following built-in exceptions raised? Give examples to support your answer.

ZeroDivisionError