CBSE Class 12 Informatics Practices Sample Paper 2013 (4)

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CBSE Class 12 Informatics Practices Sample Paper 2013 (4). Based on CBSE and CCE guidelines. The students should practice these Question Papers to gain perfection which will help him to get more marks in CBSE examination. Please refer to more CBSE Class 12 question papers in other links. The CBSE Question papers are prepared based on trend in past examinations and expected questions in CBSE exams. Its always recommended by CBSE to practice the papers released by CBSE to get better exams in CBSE exams. CBSE Last Year Question Papers for class 12 for final/ term/ SA1/ SA2 Examinations conducted by Central Board of Secondary Education for all CBSE affiliated schools in India and abroad. Please refer to more CBSE Class XII sample papers, question papers, HOTs etc in other links.

SECTION -A

1. Answer the following questions :

(a) Define Data Warehousing and explain its usage. 

(b) What do you understand by the term SDLC ? Name its essential components. 

(c) Explain the term Front End Tool and Back End Tool in the context of software development process. 

(d) What is the Entity Relationship Model ? Explain the concept of ER Model using the case study of a School that has three entities : Student, Teacher   and Subject. Assume that each student can study more than one subject while each teacher can teach only one subject. 

2. Answer the following questions :

(a) What are conditional or decision control statements ? Name the two conditional statements used in Visual Basic. 

(b) Differentiate between public and private variables and discuss their scope of visibility. 

(c) Explain the terms ODBC and OLE-DB. 

(d) Differentiate between SDI Form and MDI Form in Visual Basic. In the Similar context, explain the concept of parent and child forms

3. Answer the following questions :

(a) Differentiate between DML and DCL giving suitable example in each case. 

(b) What is NULL value ? What is the result of an arithmatic operation containing NULL value ? 

(c) What is the use of a Sub-Query ? Which query gets executed first, the parent query or the sub query ? 

(d) Which PL/SQL command is used to display an output on the screen ? Also name the command used to enable the server output option before using the above command.

(e) Differentiate between Row-level and Statement-level triggers in PL/SQL.

Please refer to attached file for CBSE Class 12 Informatics Practices Sample Paper 2013 (4)

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