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Class 12 CBSE Pre Board 2016 : Computer Science (The Navodaya Academy, Namakkal)

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Bhuvi Eswari
Rathnavel Subramaniam College of Arts & Science (RSCAS)
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THE NAVODAYA ACADEMY SR SEC SCHOOL CBSE - NAMAKKAL CLASS : 12 COMPUTER SCIENCE TIME: 3 HRS MAX MARKS: 70 ANSWER ALL THE QUESTIONS COMPULSORY NOTE: - PROGRAMMING LANGUAGE : C++ A1. Explain the concept of candidate key with an example. A2.Consider the following table and answer the questions given below 2 2 i)Identify the Primary key/Keys in this table. ii) What will be the domain of the column LASTNAME? A3. What do you mean by Union & Cartesian Product operation in relational algebra? 2 A4. Define Cardinality & Degree upon the table given. 2 A5. Mention the advantages of relational database. 2 B1. Given the following truth table, derive a Sum of Product (SOP) and Product of Sum (POS) form of Boolean expression from it 2 X Y Z G(X,Y,Z) 0 0 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1 0 0 0 1 0 1 1 1 1 0 0 1 1 1 1 B2. Prove that AB+BC+AC =B algebraically 2 B3. Design (A+B).(C+D) using NOR Gate 2 B4. Draw the logic circuit for the following expression 2 A.(B+C ) B5.Convert the following Boolean expression into its equivalen Canonical Product of Sum form (POS) 1 AB C+A BC+A BC B6. State and prove De Morgan Law using Truth table 2 B.a)Write the POS form of a Boolean Function F, which is represented in a truth table as follows: 2

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