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CBSE AISSCE 2016-2017 Marking Scheme for Computer Science
(Sub Code: 083 Paper Code 91 Outside Delhi)

(viii) SELECT DTITLE FROM DVD
WHERE DTYPE NOT IN (​"​Folk​"​, ​"​Classical​"​);

Ans DTITLE
A day in life

(½ Mark for correct output)

NOTE:
No marks to be awarded for any other output

6 a. State DeMorgan’s Laws of Boolean Algebra and verify them using truth table. 2
Ans (i) (A.B)'=A'+B'
(ii) (A+B)'=A'.B'

Truth Table Verification:
(i)
A B A.B (A.B)’ A’ B’ A’+B’
0 0 0 1 1 1 1
0 1 0 1 1 0 1
1 0 0 1 0 1 1
1 1 1 0 0 0 0

(ii)
A B A+B (A+B)’ A’ B’ A’.B’
0 0 0 1 1 1 1
0 1 1 0 1 0 0

1 0 1 0 0 1 0
1 1 1 0 0 0 0

(1 Mark for stating any one De Morgan’s Theorems correctly)
(1 Mark for correctly verifying any one De Morgan’s Theorems using Truth
Table)

b. Draw the Logic Circuit of the following Boolean Expression using only NOR Gates: 2
(​A+B).(C+D)

Ans

(Full 2 Marks for drawing the Logic Circuit for the expression correctly)
OR

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