CBSE Class 11 Informatics Practices Sample Paper Set 25

Q1. (a) Out of the following devices , classify them as input & output devices.

(i) Light pen 

(ii) flatbed plotter 

(iii) drum printer 

(iv) OMR 

(b) Differentiate between the application software & system software 

(c) What measure would you take to avoid: 

(i) virus attack (ii) PC intrusion

(d) Write the function of the following : (i) address bus (ii) control bus 

Q2. (a) What is the name of event listener interface for action events ? 

(b) What is the significance of break in a switch. 

(c) Differentiate between the following: 

(i) for and while 

(ii) break and continue 

(d) Why is program maintenance considered very important. 

(e) Marks of a student is stored in a string variable strMarks. Write a java statements to convert marks in double variable dblMarks.

Q3. (a) What is a database? Also explain the relational database. 

(b) What is Primary Key? How it is different from candidate key ,explain with eg. 

(c) Differentiate between the following: 

( i) DDL & DML commands. (ii) in / between operator

(d) Describe the order by clause with syntax & example. 

(e) A table ‘Customers’ in a database has 5 columns and no rows in it. What is its cardinality? What will be its cardinality if 4 rows are added in the table?

Q4. (a) The following code has some errors. Rewrite the correct code :

int i,j=5; 2

i==j+5;

if(i=j)

{

jTextField1.setText(“i and j are unequal”);

jTextField2.setText(“they are not equal”); break;

}

else jTextField1.setText(“i and j are equal”);

(b) Write code to add an element (“New Course”) to a list (SubList) at the beginning of the list.

(c) What will be the output produced by following code fragment? 

flaot x=9;

float y=5;

int z=(int)(x/y);

switch(z)

{

Refer to attached file for CBSE Class 11 Informatics Practices Sample Paper Set Y