CBSE Class 12 Informatics Practices Sample Paper 2021 Set 03

CBSE Class 12 Informatics Practices Sample Paper 2021 Set C. CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

1. a) What is the name of the network topology in which each node is connected independently using a switch? Draw diagram of that topology.

b) What is meant by "Denial of Service" with reference to Internet service?

c) State two advantage of networking computers instead of having stand alone computers.

d) What was the objective behind developing UNICODE?

e) Expand the following terms:

i) WAN

ii) OSS

f) What is the purpose of switch in a network?

g) Identify the following devices:

i. An intelligent device that connects several nodes to form a network and redirects the received information only to intended node(s).

ii. A device that regenerates (amplifies) the received signal and re-transmits it to its destination.

2. a) What will be the value stored in jTextArea1 after the execution of the following loop?

for (int I=5; I<=25; I+=5) [2]

jTextArea1. setText(jTextArea1. getText( ) + " "+Integer.toString(2*I));

b) Explain with the help of example(s) the difference between container and empty tags of HTML.

c) Distinguish between ' / ' and ' % ' operators.

d) What is a button group? Which control is generally used with a button group?

e) Which property of ListBox is used to display values in the list?

f) Which tags of HTML are used to

i) Change the font in a page

ii) Add a row in a table?

3. a) Name the method used to perform the following in NetBeans:

i) To set component visible at run time

ii) To return the index value of the selected item from the list

b) Gopi Krishna is using a table Employee. It has the following column:

Code, Name, Salary, Deptcode

He wants to display maximum salary department wise.

He wrote the following command

SELECT Deptcode, Max(Salary) FROM Employee;

But he did not get the desired result.

Rewrite the above query with necessary change to help him get the desired output.

c) Which MySql command will be used to open an already existing databse "LIBRARY".

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