Informatics Practices Set 4 2021-2022 Commerce (English Medium) Class 12 Question Paper Solution

Rushil thought "WWW" and "internet" are synonyms i.e., they meant same and can be used interchangeably. But the teacher said that they are not same. Help him to understand the meaning of both the terms with the help of a suitable example of each.

What do you understand by the term cookies?

How can we disable cookies?

What is the primary function of a gateway in a computer network? Explain briefly.

Give examples of any two plug-ins. 

Find the output of the following SQL query:

SELECT ROUND(7658.345,2); 

Find the output of the following SQL query:

SELECT MOD(ROUND (13.9,0),3);

Give any two differences between the POWER() and SUM() SQL function.

Give one advantage of Bus topology.

Give one disadvantage of Bus topology.

Give one advantage of Star topology.

Give one disadvantage of Star topology.

Find the output of the following SQL query:

SELECT SUBSTR("FIT INDIA MOVEMENT",5);

Find the output of the following SQL query:

SELECT INSTR("ARTIFICIAL INTELLIGENCE", "IA");

Srikanth created the foollowing table STUDENT in his database.

Table: STUDENT

He now wants to count number of students in each class where the number of students is more than 3. He has executed the following query:

SELECT MAX (Marks) FROM STUDENT WHERE COUNT(*)>3 GROUP BY Class;

But, he got an error. Identify the error(s) and rewrite the query. Also underline the correction(s) done.

Ms. Mohini is working in a school and stores the details of all students in a table SCHOOLDATA.

Write SQL statements from the above given table to:

1. To remove leading spaces from the column Name.
2. Display the names of students who were born on Sunday.

Predict the output if the following SQL queries from the given table: SCHOOLDATA

Predict the output of the following SQL query:

SELECT TRIM(" ALL THE BEST ");

Predict the output of the following SQL query:

SELECT POWER(5,2);

Predict the output of the following SQL query:

SELECT UPPER(MID("Start up India",10));

Consider a table "MYPET" with the following data:

Write SQL queries for the following:

1. Display the Breed of all the pets in uppercase.
2. Display the total price of all the pets.
3. Display the average life span of all the pets.

Write the name of the SQL function to perform the following operation:

Diplay name of the Month from your date of birth.

Write the name of the SQL function to perform the following operation:

Convert email-id to lowercase.

Write the name of the SQL function to perform the following operation:

Count the number of characters in your name.

Consider the following table: PRODUCT

                Table: PRODUCT

Find the output of the following SQL queries:

1. SELECT 10+MOD(QUANTITY,3) FROM PRODUCT WHERE PNAME = "Eraser";
2. SELECT ROUND(PRICE,2)*QUANTITY FROM PRODUCT WHERE QUANTITY>2;
3. SELECT UCASE(RIGHT(PNAME,2)) FROM PRODUCT;

Consider the table: ITEM

                                  Table: ITEM

Write SQL queries for the following:

1. Display all the records in descending order of Stockdate.
2. Display the Type and total number of items of each Type.
3. Display the least Price.
4. Display the Itemname with their price rounded to 1 decimal place. 

Consider the following table:

                     Table: SALESMAN

Predict the output for the following SQL queries:

1. SELECT MAX(Qtysold), MIN(Qtysold) FROM SALESMAN;
2. SELECT COUNT (Area) FROM SALESMAN;
3. SELECT LENGTH (Sname) FROM SALESMAN WHERE MONTH(Dateofjoin)=10;
4. SELECT Sname FROM SALESMAN WHERE RIGHT(Scode,1)=5;

Consider the following table:

                     Table: SALESMAN

ABC International School, Delhi has different wings Administrative Wing (W1), Primary Wing (W2), Middle Wing (W3), and Secondary Wing (W4), as shown in the diagram:  

The school also has a branch in Mumbai. The school management wants to connect all the wings as well as all the computers of each wing (W1, W2, W3, W4).

Distance between the wings are as follows:

Number of computers in each of the wing:

Based on the above specifications, answer the following questions:

1. Suggest the topology and draw the most suitable cable layout for connecting all the wings of Delhi branch.
2. Suggest the kind Of network required (out of LAN, MAN, WAN) for connecting
   1. Administrative Wing (W1) with Middle Wing (W3).
   2. Administrative Wing (W1) with the Mumbai Branch.
3. Suggest the placement of the following devices with Justification:
   1. Repeater
   2. Switch/Hub
4. Due to pandemic school had to adopt Online classes. Suggest the protocol that is used for sending the voice signals over internet. Also, give an example of an application of WWW that helped the teachers to send messages instantly to the students.