CBSE Class 12 Informatics Practices Sample Paper 2018 Set B

SECTION – A

1. (a) Out of the following devices, which device will you prefer to connect all the computers with in an office? 

(i) Telephone

(ii) Hub/Switch

(iii) Modem

(b) Expand the following terms? 

(i) FLOSS

(ii) SMTP

(c) Name the organization which is dedicated to cause of promoting Open Source Software? 

(d) For what purpose a Repeater is used? 

(e) What is the difference between LAN and WAN? 2 (f) What is Standard? What are its types? 

(g) Give two disadvantages/advantages of Star Topology. 

2. (a) What is wrong with following code: 

int n=2;

switch (n)

{

case 1:

a1 = 10;

a2 = 20;

break;

case 2:

a3 = 30

break;

a4 = 40;

}

(b) What is the purpose of break statement in a loop? 

(c) Which is the largest heading tag? 

(d) What is the role of ALIGN attribute of <TABLE> tag? 

(e) How many times the following loop be executed? 

int a=5, b= 25;

while (a<=b)

{

a =a+10;

b= b-10;

}

(f) Write a function in Java which accepts length and breadth of a rectangle and returns its area. 

(g) Write two differences between HTML & XML tags? 

3. (a) What are the two symbols used with LIKE clause? 1 (b) Rakesh created a table in MySql. Later on he found that one column is no longer required in the table. Which command he should use to delete the column from the table? 

(c) What is candidate key? 

(d) Which function in MySQL removes leading as well as trailing space from a character string? 

(e) What are Group functions? Name any two Group functions used in Mysql. 

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