Page 632 - ComputerScience_Class_11

COMPUTER SCIENCE

SAMPLE PAPER

(THEORY)

Maximum Marks: 70
Time Allowed: 3 Hrs.
(Candidates are allowed additional 15 minutes for only reading the paper.
They must NOT start writing during this time).
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
The intended marks for questions or parts of questions are given in brackets [ ].

PART I (20 Marks)
Answer all questions.
While answering questions in this Part, indicate briefly your working and reasoning, wherever required.
Question 1. [10 × 1 = 10]
(i) Which one of the following symbols represents equivalence operation? [1]
(a) ʌ (b) →
(c) v (d) ↔
(ii) Inverse of conditional a →b’ is [1]
(a) a’ → b (b) b →a’
(c) b ‘ → a (d) b’ → a’
(iii) Complement of A ʌ 0 is [1]
(a) tautology (b) contradiction
(c) contingency (d) equivalent
(iv) The Boolean expression for a two variable XOR gate is [1]
(a) A’.B+ A.B’ (b) A’.B ‘+ A.B’
(c) A.B + A’.B (d) A’.B’ + A.B
(v) The given Truth table represents which connective? [1]
A B Output
0 0 1
0 1 0
1 0 0
1 1 1
(a) Conjunction (b) Disjunction
(c) Conditional (d) Bi conditional
(vi) In which of the following gates the output is 0 when all inputs are 1? [1]
(a) AND (b) XOR
(c) NAND (d) OR
(vii) Predict the output of the Java expression:
System.out.println(“ARTIFICIAL INTELLIGENCE”.charAt(“JAVA”.lastIndexOf(‘A’))); [1]
(viii) Write a JAVA statement to store number of rows and columns of a two dimensional array arr[ ][ ]. [1]

630 Touchpad Computer Science (Ver. 3.0)-XI