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# CBSE Question Paper 2007 class 12 Informatics Practices

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CBSE Question Paper 2007 class 12 Informatics Practices conducted by Central Board of Secondary Education, New Delhi in the month of March 2007. CBSE previous year question papers with solution are available in myCBSEguide mobile app and cbse guide website. The Best CBSE App for students and teachers is myCBSEguide which provides complete study material and practice papers to CBSE schools in India and abroad.

CBSE Question Paper 2007 class 12 Informatics Practices

## CBSE Question Paper 2007 class 12 Informatics Practices

### General Instructions:

• This question paper is divided into 3 sections.
• Section A consists of 30 marks.
• Section B and Section C are of 20 marks each.

### 1. Answer the following questions:

(a) Define (i) Freeware (ii) Shareware (2)
(b) Write one point of difference between front end and back end with one example of each. (2)
(c) Write one example each of “one to many” and “many to many” relationships between two entity sets. (2)
(d) What is the purpose of Data Mining? (2)
(e) During System Development Life Cycle, in which phase is the scope and true nature of problem determined? Explain in brief with the help of an example. (2)

### 2. Answer the following questions:

(a) How many value(s) does a Procedure and a Function return? (2)
(b) Distinguish between Single Document Interface and Multiple Document Interface. Write one example each of SDI and MDI type application. (2)
(c) What is Selection statement? Name any two selection statements that VB provides. (2)
(d) What are Events? What are Event Procedures? How are they related? (2)
(e) What is a Bound Control? Name any two data-aware properties of bound controls. (2)

### 3. Answer the following questions:

(a) Which statement must be present in a simple loop (Loop. Endloop) so that it does not become an infinite loop? (1)
(b) Suggest parameters mode (IN/OUT/IN OUT) for the following: (1)
(i) Parameter can be used as a normal variable.
(ii) Passed value must not get changed.

(c) Write two points of differences between SQL and PL/SQL. (2)
(d) How are triggers similar to Constraints? Write one point. (2)
(e) What is the purpose of cursor in PL/SQL? Name the types of cursors used in PL/SQL. (2)
(f) Why do we use Rollback statement? Explain in brief with the help of an example. (2)

### Section-B

4. Read the following case study and answer the questions that follow:
ABC Company has developed the following interface to enter and display data related to Income tax of employees.

### The form details of the above form are given in the following table:

 Object Type Object Name Description Form FrmSalary The main Form Object Text box TxtEmpCode To enter code of Employee. TxtName To enter Name of Employee. Txtlncome To enter Taxable Income of Employee. TxtlTax To display Income tax TxtEdTax To display Educational tax TxtSurcharge To display Surcharge TxtTotalTax To display Total Tax to be paid by the employee. Command Button cmdCalculate To calculate Income tax, Education Tax, Surcharge and Total Tax cmdClear To clear all the values in Text boxes cmdExit To close the application.

### Write code to implement the following:

(a) When the form loads text boxes for Income tax, Education Tax, Surcharge and Total Tax Amount should be disabled. They should be enabled only when Calculate command button is clicked. (2)
(b) Taxable Income entered should be numeric data. (2)
(c) When the user clicks the Clear command button, textboxes EmpCode and EmpName should be set to blank and other textboxes should be set to zero. (2)
(d) When Calculate command button is clicked, Income tax, Education Tax, Surcharge and Total Tax (sum of Income Tax, Education Tax, Surcharge) is displayed in their respective text boxes based on the following criterion. (4)

 Taxable Income Income Tax Education Tax Surcharge UptoRs. 1,00,000 Nil Nil Nil Rs. 1,00,001 to 1,50,000 10% of the amount exceeding Rs. 1,00,000 2% of Taxable Income Nil Rs. 1,50,001 to 2,50,000 Rs. 5,000+20% of amount exceeding Rs. 1,50,000 2% of Taxable Income Nil Rs. 2,50,001 and above Rs. 25,000+30% of the amount exceeding Rs. 2,50,000 2% of Taxable Income l% of Taxable Income.

### 5. Answer the following questions:

(a) How many times will the following loop execute? (2)
1 = 6
Do While I > = -1
I -1-2
Print I
Loop

(b) Write the output that the following code segment will generate (2)

String1 = “Class XII”
String2 = “XI”
Print String1 + String2
print InStr (String1, String2)
Mid (LCase(String1), 6, 3)
Print Int(4.7) + Len(String 2)

(c) Rewrite the following code using If Elself 2
Select Case Code
Case Is > 45
Message1 = “Ersor”
Case10 To 20
Message 1 = “Accounts”
Case 21 To 30
Message 1 = “Personnel”
Case 31 To 45
Message 1 = “EDP”
Case Else
End Select

(d) Write a function that receives two integers as arguments and returns the following: 4
0 if both are equal
– 1 if first is greater than the second
1 if second is greater than the first

Section-C

(a) Write PL/SQL cursor declaration to store Employee code(EMPNO), Employee name(ENAME) of employees from Emp table who are located (LOC) in Delhi. (2)

(b) Write the output produced by the following code in PL/SQL (2)

declare
cnt number;
num number;
begin
cnt: – 8;
num : = 4;
while cnt>4 loop
num : = num-2;
cnt: = cnt-1;
if cnt>4 then
dbms_output.put_line(cnt);
end if;
end loop;
dbms_output.put_line(num);
end;

(c) Find error(s) in the following PL/SQL code and rewrite the correct code after underlining the corrections made. (2)

DECLARE
CTR NUMBER;
SUM1 NUMBER;90/1 6
BEGIN
CTR: = 0;
SUM1: = 0;
LOOP
SUM1: = SUM1 + CTR;
PRINT(TO_CHAR(SUM1));
CTR: = CTR-2;
IF CTR > 2 THEN
EXIT;
END LOOP;

(d) Create a procedure called Select employee that selects the first name, last name, join date, and salary for employee with employee code 100 from EMP table into variables and displays values stored in these variables.

Table Emp consists of fields with field names: ID,
FIRST_NAME, LAST_NAME, JOIN_DATE, SALARY 4

### 7. Answer questions based on the table Student given below:

Table: Student

 Column Name Data Type Size Description Constraint RollNumber NUMBER 2 Student’s Roll number Primary key Name VARCHAR2 25 Name of Student NOT NULL Class VARCHAR2 3 Class of Student Stream VARCHAR2 15 Stream opted by the Student TotalMarks NUMBER 8,2 Total marks scored by the student Grade VARCHAR2 1 Grade scored by the student Can be’ A’ or ‘B’ or ‘C

(a) Write SQL command to display Roll numbers, names, Total marks and grades of all the students in “Nonmedical” stream sorted by Total marks in descending order. (2)

(b) Write SQL command to create a view consisting of all students in “Medical” stream and who have scored “A” grade. (2)

(c) Write PL/SQL Procedure that takes in Student’s Roll number as a parameter and increases Total marks of that student by 2% (as he/she is a Sports person.) (3)

(d) Create a Trigger to display the name and stream of Student(s) whose record(s) is/are being deleted from the Student table. (3)

## CBSE Question Paper 2007 class 12 Informatics Practices

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## Previous Year Question Paper for class 12 in PDF

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