Computing

Question 1

What is bit rate?

Answer 1

The number of bits of data that are processed every second

Question 2

What is baud rate?

Answer 2

The number of signal changes that occurs every second.

Question 3

What’s The Difference Between LAN and WAN?

Answer 3

LAN is a local area network and is two or more computers connected over a small geographical area whereas WAN is a wide area network connected over a large geographical area made up of multiple LAN’s via the internet

Question 4

What is a natural number?

Answer 4

Any whole positive number, including 0

Question 5

What is serial transmission?

Answer 5

When data travels in bits one after another in a single cable

Question 6

What is an integer?

Answer 6

Any whole number

Question 7

What is a logical topology?

Answer 7

Defines how devices communicate across Physical Topologies

Question 8

What is Asynchronous transmission?

Answer 8

There is no common clock signal so additional data is used to stop the signal (Stop and Start data) is used to control the signal data is transmitted when its available rather than at specific intervals

Question 9

What is a physical topology?

Answer 9

Defines how devices are physically connected via cabling

Question 10

What is a rational number?

Answer 10

A number that can be represented as a fraction.

Question 11

What is an irrational number?

Answer 11

A number that cannot be expressed as a fraction.

Question 12

Sound - What is the Nyquist Theorem?

Answer 12

A sample has to be double the original frequency to replicate the original soundwave and there is a limit on the original sample frequency - Fs > 2F max and it measures the highest and lowest points of a wave in sound

Question 13

Sound - What is sampling rate?

Answer 13

The number of samples of audio recorded every second measured in hertz.

Question 14

Sound - What is Sampling Resolution?

Answer 14

It is the number of bits per sample.

Question 15

Sound - What is amplitude?

Answer 15

The maximum distance moved by a point on a wave measured from the centre position.

Question 16

What is a real number?

Answer 16

Any positive or negative number, including fractions

Question 17

Sound - What are channels?

Answer 17

The amount of points from where the sound originates

Question 18

What is an ordinal number?

Answer 18

A number that identifies a position within a series e.g. first, second, third

Question 19

Sound - What is Midi Sound?

Answer 19

Stands for musical instrument digital interface and it connects devices that make and control sound so computers can communicate with each other

Question 20

Error checking - What is ISBN error checking?

Answer 20

A format of error checking where the values in the number come together to form a checksum that is equal to the last digit, checking if the number is correct

Question 21

Using ISBN error checking, what is the missing number. 978-0-141-33909-?

Answer 21

2

Question 22

Error checking - What is parity error checking?

Answer 22

A form of error checking where the number of 1s are counted, and based on that number, a 1 or a 0 is put in front of the series of bits and the receiver checks the series of bits. If the parity bit is incorrect, it means that there was an error in the transmission.

Question 23

Error checking - What are the disadvantages to parity?

Answer 23

• if there is an even number of errors, the computer wont be able to identify if there has been an error or not

Question 24

What is serial transmission?

Answer 24

When bits of data are sent one after the other in a sequence on a single wire

Question 25

What is parallel transmission?

Answer 25

When bits of data are sent simultaneously over a series of wires

Question 26

What are the disadvantages of serial transmission?

Answer 26

• The speed of the data being sent tends to be slower than parallel transmission

Question 27

What are the disadvantages of parallel transmission?

Answer 27

• Some data is transferred faster than others so the data is received out of order - This is called skew
• Due to the speed that data can be transferred, magnetic fields can be formed around the wires, causing data to jump from one wire to another, causing erroneous data - This is called crosstalk

Question 28

What are the advantages of parallel transmission?

Answer 28

-The data can be sent quickly over short distances, so it is great to use in PCs

Question 29

What are the advantages of serial transmission?

Answer 29

• Data can be sent over long distances with little to no errors occuring

Question 30

What does Wi-Fi stand for?

Answer 30

Trick question - it doesn’t stand for anything and was a marketing term

Question 31

What’s needed to connect to a wireless network?

Answer 31

• ISP - An Internet Service Provider
• Modem and wireless router (often combined)
• Device with a network interface card (NIC)

Question 32

What is a Service Set IDentifier (SSID)?

Answer 32

A networks name