Paper 2 CS · UNIT 09 · MOCK TEST

Mock 2 – Data Communication & Physical Layer (Part 2)

Unit 9: Data Communication and Computer Networks · 16 questions · about 19 minutes. Press End Mock any time to see your score and the correct answers.

All 13 topic-wise mocks in this unit

0 / 16 answered 00:00

Q1.

Which of the following are examples of data encoding schemes?

A. Non-Return to Zero (NRZ)

B. Manchester Encoding

C. Amplitude Modulation

D. Hamming code

E. Bipolar AMI

AA, C and D Only BA, B and D Only CC, D and E Only DA, B and E Only

Q2.

Match List I (line coding scheme) with List II (average bandwidth, N = data rate). List I: A. NRZ-L, B. 2B1Q, C. 4D-PAM5, D. MLT-3. List II: I. B = N/4, II. B = N/8, III. B = N/3, IV. B = N/2.

AA-II, B-I, C-IV, D-III BA-IV, B-II, C-I, D-III CA-IV, B-I, C-II, D-III DA-III, B-IV, C-II, D-I

Q3.

According to the Nyquist theorem to produce the original analog signal, one necessary condition is :

ASampling rate must be at least 2 times the highest frequency contained in the signal BSampling rate must be at least 2 times the lowest frequency contained in the signal 1 CSampling rate must be at least times the 2 highest frequency contained in the signal 1 DSampling rate must be at least times the 2 lowest frequency contained in the signal

Directions (Q36–40): A 3000 km long trunk operates at 1.536 Mbps and transmits 64-byte frames using a sliding window protocol. The propagation speed is 6 μs/km.

Q4.

The maximum achievable throughput is

A0.768 B0.678 C0.901 D0.887

Q5.

Which of the following statement is False?

APacket switching leads to better utilization of bandwidth resources than circuit switching. BPacket switching results in less variation in the delay than circuit switching. CPacket switching sender and receiver can use any bit rate, format or framing method unlike circuit switching. DPacket switching can lead to reordering unlike circuit switching.

Q6.

In Ethernet when Manchester coding is used, the bit rate is__________

AHalf the baud rate Btwice the baud rate CThrice the baud rate DSame as the baud rate

Q7.

Which of the following statements are true?

A. Frequency division multiplexing technique can be handled by digital circuits.

B. Time division multiplexing technique can be handled by analog circuits

C. Wavelength division multiplexing technique is used with optical fiber for combining two signals.

D. Frequency division multiplexing technique can be applied when the bandwidth of a link is greater than the bandwidth of the signals to be transmitted.

AB and D only BC and D only CA and D only DB and D only

Q8.

The period of a signal is . Then the frequency of this signal in kilohertz is ______

A10 B10⁻¹ C10⁻² D10⁻³

Q9.

Given below are two statements:

Statement I: The laws of nature put two fundamental limits on the data rate of a channel. The H.Nyquist limit restricts the number of independent samples per second to twice the bandwidth in a Noiseless channel.

Statement II: Shannon's major result about noised channel is that the maximum data rate of a channel whose bandwidth is HHz, and whose S signal-to-noise ratio is N is given by: S Maximum number of bits/sec= Hlog ( 1+ ) 2 N In the light of the above statements, choose the correct answer from the options given below

ABoth Statement I and Statement II are true BBoth Statement I and Statement II are false CStatement I is correct but Statement II is false DStatement I is incorrect but Statement II is true.

Q10.

A network with bandwidth of 10 Mbps can pass only an average of 12.000 frames per minute with each frame carrying an average of 10,000 bits. What is the throughput of this network?

A1,000,000 bps B2,000,000 bps C12,000,000 bps D120,000,000 bps

Q11.

Consider the following statements :

(a) Fiber optic cable is much lighter than copper cable.

(b) Fiber optic cable is not affected by power surges or electromagnetic interference.

AOnly (a) and (b) BOnly (a) and (c) COnly (b) and (c) D(a), (b) and (c)

Q12.

Which of the following statements is/are true? P : An XML document with correct syntax as specified by W3C is called "Well Formed". Q : An XML documented validated against a DTD is both "Well formed" and "Valid". R : <xml version="1.0" encoding="UTF-8"> is syntactly correct declaration for the version of an XML document. Select the correct answer from the options given below : P Q

Aand only P R Band only Q R Cand only P, Q R DAll of and

Q13.

You are designing a link layer protocol for a link with a bandwidth of 1 Gbps (109bits/second) over a fiber link with a length of 800 km. Assume the speed of light in this medium is 200000 km/second. What is the propagation delay in this link?

A1 millisecond B2 milliseconds C3 milliseconds D4 milliseconds

Q14.

A slotted ALOHA network transmits 200-bit frames using a shared channel with a 200 Kbps bandwidth. Find the throughput of the system, if the system (all stations put together) produces 250 frames per second :

A49 B368 C149 D151

Q15.

The period of a signal is 100 ms. Its frequency is _________.

A10³ Hz B10⁻² kHz C10⁻³ kHz D10⁵ Hz

Q16.

Which of the following statements is/are true?

(a) Three broad categories of Networks are

(i) Circuit Switched Networks

(ii) Packet Switched Networks

(iii) Message Switched Networks

(b) Circuit Switched Network resources need not be reserved during the setup phase.

A(a) and (b) only B(b) and (c) only C(a) and (c) only D(a), (b) and (c)

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