Computer Science Study Materials for Competitive Exams

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Monday, 26 September 2016

CBSE UGC NET Computer Science Paper III August 2016 (Re-test) - Part 3

21.       Assume that the program ‘P’ is implementing parameter passing with ‘call by reference’. What will be printed by following print statements in P?
Program P()
x = 10;
y = 3;
funb (y, x, x)
print x;
print y;
funb (x, y, z)
y = y + 4;
z = x + y + z;
(A) 10, 7             (B) 31, 3
(C) 10, 3            (D) 31, 7
Answer: B
22.       The regular grammar for the language L = {anbm | n + m is even} is given by
(A) S → S1 | S2
S1 → a S1 | A1
A1 → b A1 | λ
S2 → aaS2 | A2
A2 → b A2 | λ
(B) S → S1 | S2
S1 → a S1 | a A1
S2 → aa S2 | A2
A1 → bA1 | λ
A2 → bA2 | λ
(C) S → S1 | S2
S1 → aaa S1 | aA1
S2 → aaS2 | A2
A1 → bA1 | λ
A2 → bA2 | λ
(D) S → S1 | S2
S1 → aa S1 | A1
S2 → aaS2 | aA2
A1 → bbA1 | λ
A2 → bbA2 | b
Answer: D
23.       Let Σ = {a, b} and language L = {aa, bb}. Then, the complement of L is
(A) {λ, a, b, ab, ba} È {w ϵ {a, b}* | |w| > 3}
(B) {a, b, ab, ba} È {w ϵ {a, b}* | |w| ≥ 3}
(C) {w ϵ { a, b}* | |w| > 3} È {a, b, ab, ba}
(D) {λ, a, b, ab, ba} È {w ϵ {a, b}* | |w| ≥ 3}
Answer: D
24.       Consider the following identities for regular expressions :
(a) (r + s)* = (s + r)*
(b) (r*)* = r*
(c) (r* s*)* = (r + s)*
Which of the above identities are true ?
(A) (a) and (b) only      (B) (b) and (c) only
(C) (c) and (a) only      (D) (a), (b) and (c)
Answer: D
25.       Suppose transmission rate of a channel is 32 kbps. If there are ‘8’ routes from source to destination and each packet p contains 8000 bits. Total end to end delay in sending packet P is ................
(A) 2 sec            (B) 3 sec
(C) 4 sec            (D) 1 sec
Answer: A

26.       Consider the following statements :
a. High speed Ethernet works on optic fiber.
b. A point to point protocol over Ethernet is a network protocol for encapsulating PPP frames inside Ethernet frames.
c. High speed Ethernet does not work on optic fiber.
d. A point to point protocol over Ethernet is a network protocol for encapsulating Ethernet frames inside PPP frames.
Which of the following is correct ?
(A) a and b are true; c and d are false.
(B) a and b are false; c and d are true.
(C) a, b, c and d are true.
(D) a, b, c and d are false.
Answer: A
27.       In CRC checksum method, assume that given frame for transmission is 1101011011 and the generator polynomial is G(x) = x4 + x + 1.
After implementing CRC encoder, the encoded word sent from sender side is .............
(A) 11010110111110
(B) 11101101011011
(C) 110101111100111
(D) 110101111001111
Answer: A
28.       A slotted ALOHA network transmits 200 bits frames using a shared channel with 200 kbps bandwidth. If the system (all stations put together) produces 1000 frames per second, then the throughput of the system is .................
(A) 0.268           (B) 0.468
(C) 0.368           (D) 0.568
Answer: C
29.       An analog signal has a bit rate of 8000 bps and a baud rate of 1000.
Then analog signal has .............. signal elements and carry ............ data elements in each signal.
(A) 256, 8 bits               (B) 128, 4 bits
(C) 256, 4 bits               (D) 128, 8 bits
Answer: A
30.    The plain text message BAHI encrypted with RSA algorithm using e=3, d=7 and n=33 and the characters of the message are encoded using the values 00 to 25 for letters A to Z. Suppose character by character encryption was implemented. Then, the Cipher Text message is ............
(A) ABHI            (B) HAQC
(C) IHBA            (D) BHQC
Answer: B

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