# KPK 9th Class Computer Chapter 4 Data Communication Short Questions Answers

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Class/Subject: 9th Class Computer

Chapter Name: Data Communication

Board: All KPK  Boards

• Malakand Board 9th Class Computer Chapter 4 Data Communication  short questions Answer
• Mardan Board 9th Class Computer Chapter 4 Data Communication short questions Answer
• Peshawar Board 9th Class Computer Chapter 4 Data Communication short questions Answer
• Swat Board 9th Class Computer Chapter 4 Data Communication short questions Answer
• Dera Ismail Khan Board 9th Class Computer Chapter 4 Data Communication short questions Answer
• Kohat Board 9th Class Computer Chapter 4 Data Communication short questions Answer
• Abbottabad  Board 9th Class Computer Chapter 4 Data Communication short questions Answer
• Bannu Board 9th Class Computer Chapter 4 Data Communication short questions Answer

• All KPK Boards 9th Class  Computer Annual Examination
• Schools 9th Class Computer December Test
• KPK 9th Class Computer Test
• Entry Test questions related Computer

## KPK 9th Class Computer Chapter 4 Data Communication Short Questions Answers

What is Data Communication?

The process of transferring / sending / exchanging data from one place / device to another place / device through any medium is known as data communication. For example when two persons are talking with each other, it is known as data communication.
In case of computers, when encoded information/data is transferred from one computer to another through any transmission media, its is known as data communication.
Examples:
SMS /MMS, voice / video calls, TV / Cable transmission etc.

Differentiate between Analog and Digital signals.

Analog Signals: The signals in the wave / continuous form are known as Analog signals. The analog signal consist of time varying quantities. Such signals are used to measure the physical quantities like light, sound temperature, pressure etc. The example of analog signals are Light waves, Sound waves, Radio waves etc.
Digital Signals: The signals in discrete form are called digital signals. The digital signals consist of individual and discrete electronic pulses that represent bits grouped together into bytes. The examples are computer data, Microwave system or satellite service, IR communication.

Define the following properties of a good communication system.
a) Delivery b) Accuracy c) Timeliness

A. Delivery
The process of getting information about communication from source to destination is called delivery. In most of communication system, delivery report is used for this purpose.
Example: SMS Delivery, what’s App delivery.
B. Accuracy
Accuracy means 100% correctness. When the data is sent in communication system from source to destination, its successful delivery is called Accuracy. In case of any error, data corruption, data loss the system should resend the data.
C. Timeliness
The process in which data is delivery / communicated is called timeliness. In any communication system, the data must reach to destination in time. The late delivery is useless. In case of Audio / vides data communication, timely delivery means data should be received as it is produced. This kind of delivery is called Real-time transmission.

Differentiate between guided and unguided media.

 Guided Media Unguided Media In guided media the communication devices are directly Linked to each other via physical materials like wires, cables eta. It is also called cabling / wired / cabling /wired radiated media. It is most commonly used in LAN. The example are Twisted cable, tel: wire, fiber optic cable etc. In unguided media the communication devices are linked to each other via open air, space using signals. It is also known as Wireless / Non radiated media. It is used in LAN, MAN and WAN. The Examples are Radio waves, Satellites, Microwave etc.

What is the purpose of communication devices?

The devices which are used in a communication system to send/transmit/exchange the data across the network are called communication devices. The basic purpose of communication devices is to make the communication / transmission possible between Source and destination. One of the major tasks of different communication devices is to convert digital date to analog data and vice versa.

What is Signal-to-noise ratio?

The ratio of the relative power levels of a voice/data communication signals and a noise on a line is called Signal-to-noise ration. It is expressed as dB.
SNR = Signal / Noise
SNR is actually the ratio of signals (What is required)

How data rate and baud rate can be linked through formulae?

“Data rate” is expressed as bps “bits per second”. It is actually the measure of the number of bits (Os or 1s) transmitted in one second i.e. 2000 bite per second means 2000 zeros or ones can be transmitted in one second. On the other hand “Baud” is amount of time per second that a signal takes within a communication channel to change its state i.e. a 1000 Baud rate means; it can change its state thousand time per second.
Date rate and Baud be inter- related through formula as following
Data Rate (bps) =
Baud rate (baud pr second) No: of bit per Baud
OR
Baud Rate (baud per second) = ata rate (bps) / No: of bits per Baud

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