(Papers) CISCE : Download Class X Exam Papers-2017 (Computer Science)
Computer Science :
- Subject : Computer Science
- Year : 2017
- Duration : 3 Hour
- Answer all questions in Part I (compulsory) and six questions from Part-II, choosing two
- questions from Section-A, two from Section-B and two from Section-C .
- All working, including rough work, should be done on the same sheet as the rest of the answer.
- The intended marks for questions or parts of questions are given in brackets [ ].
(a) State the law represented by the following proposition and prove it with the help of a truth table: 
P V P = P
(b) State the Principle of Duality. 
(c) Find the complement of the following Boolean expression using De Morgan’s law: 
F(a,b,c) = (bʹ + c) + a
(d) Draw the logic diagram and truth table for a 2 input XNOR gate. 
(e) If (~P => Q) then write its: