Board Answer Key Informatics Practices Class 12 Best Explanation

In this article, I am going to discuss Answer Key Informatics Practices Class 12. This is not a final marking scheme but it is prepared by us according to our knowledge and experience. All answers are relevant answers according to the questions and best of my knowledge of Answer Key Informatics Practices Class 12.

Answer Key Informatics Practices Class 12

The questions paper of CBSE board is based on Term 2 CBSE Sample Paper 2022.

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Let us start the article Answer Key Informatics Practices Class 12 section A which contains each question of 2 marks.

Section A

(Each question carries 2 marks)

[1] 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.

OR

What are Cookies? How can we disable Cookies?

[2] i) What is the function of a Gateway?
Ii) Give examples of any two plug-ins.

[3] Find the output of the following SQL Queries:

i) SELECT ROUND (7658.345,2);
ii) SELECT MOD(ROUND (13.9,0),3);

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

[4] Give one advantage and disadvantage to each of Bus and Star topology.

[5] Find the output of the following SQL. queries
(i) SELECT SUBSTR(“FIT INDIA MOVEMENT”,5);
(i) SELECT INSTR(“ARTIFICIAL INTELLIGENCE”, “IA”);

[6] Srikanth created the following 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.

[7] 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:
(i) To remove leading spaces from the column Name.
(ii) Display the names of students who were born on Sunday.

OR

Predict the output of the following SQL queries from the given table SCHOOLDATA
(i)SELECT MAX(Percent) FROM SCHOOLDATA;
(ii) SELECT LEFT(Gender,1), Name FROM SCHOOLDATA WHERE YEAR (Dob)=2005;

In the next section of Answer Key Informatics Practices Class 12 we discuss Section B 3 marks questions. Let us begin!

SECTION – B
(Each question carries 3 marks)

[8] Predict the output of the following SQL queries
(i) SELECT TRIM(” ALL THE BEST “);
(ii) SELECT POWER(5,2);
(iiI) SELECT UPPER (MID(“start up india”,10);

OR
Consider a table “MYPET” with the following data:
Table: MYPET

Write SQL queries for the following:
(i) Display the Breed of all the pets in uppercase.
(ii) Display the total price of all the pets.
(iii) Display the average life span of all the pets.

[9] Write the names of SQL functions to perform the following operations:
(i) Display name of the Month from your date of birth.
(ii) Convert email-id to lowercase.
(iii) Count the number of characters in your name.

[10] Consider the following table PRODUCT:

Find the output of the following SQL queries
(i) SELECT 10+MOD(QUANTITY,3) FROM PRODUCT WHERE PNAME = “Eraser”;

(ii) SELECT ROUND(PRICE,2)*QUANTITY FROM PRODUCT WHERE QUANTITY > 2;
(iii) SELECT UCASE (RIGHT(PNAME,2)) FROM PRODUCT;

In the next section of Answer Key Informatics Practices Class 12 we discuss Section C.

SECTION – C
(Each question carries 4 marks)

[11] Consider the table: ITEM

[12] Consider the following table Table : SALESMAN

(ii) SELECT COUNT (Area) FROM SALESMAN;
(iii) SELECT LENGTH (Sname) FROM SALESMAN WHERE MONTH(Dateofjoin)=10
(iv) SELECT Sname FROM SALESMAN WHERE RIGHT(Scode, 1)=5;

OR

Based on the given table SALESMAN write SQL queries to perform the following operations:
(i) Display the maximum qtysold from each area.
(ii) Count the total number of salesman.
(iii) Display the average qtysold from each area where number of salesman is more than 1.
(iv) Display all the records in ascending order of area.

[13] 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:

Distance between the wings are as follows:

Number of computers in each of the wing:

Based on the above specifications, answer the following questions:
(i) Suggest the topology and draw the most suitable cable layout for connecting the Delhi branch’s wings. (ii) Suggest the kind of network required (out of LAN, MAN, WAN) for connecting
(a) Administrative Wing (W1) with Middle Wing (W3)
(b) Administrative Wing (W1) with the Mumbai branch.
(iii) Suggest the placement of the following devices with justification:
(a) Repeater
(b) Switch/Hub
(v) 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.

(i) Star topology

(iii) (a) As per cable layout given Repeater can be placed in between W3 and W4 wing.

(b) Hub or switch can be placed in each wing.

(iv) VoIP and Any chat or IM Software like whatsapp

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