2210 Computer Science Paper 12/ ON/ 2019

Paper 12/ ON/ 2019

Multiple Choice

25 kB is larger than 100 MB

• TRUE

• FALSE

Multiple Choice

999 MB is larger than 50 GB

• TRUE

• FALSE

Multiple Choice

3500 kB is smaller than 2 GB

• TRUE

• FALSE

Multiple Choice

2350 bytes is smaller than 2 kB

• TRUE

• FALSE

Open Ended

Give four components that are used in the Von Neumann model for a computer system. (Separate your answers using commas)

Multiple Choice

It has binary data.

• Analogue Data

• Digital Data

Multiple Choice

One of its examples is a sound wave.

• Analogue Data

• Digital Data

Multiple Choice

The data is continuous.

• Analogue Data

• Digital Data

Multiple Choice

It has only two values.

• Analogue Data

• Digital Data

Multiple Choice

It has non-discrete data.

• Analogue Data

• Digital Data

Convert to Denary: 0011 ​0100

Shift one place to right: 0011 ​0100

Shift four places to right: 0011 ​0100

Open Ended

What happens when binary numbers are shifted 4 places to the right?

Open Ended

Describe how lossy compression reduces the size of the sound file.

ADVANTAGES AND DISADVANTAGES OF LOSSY FILE COMPRESSION

Multiple Choice

Requires less storage space.

• Advantage

• Disadvantage

Multiple Choice

Requires less time to transmit

• Advantage

• Disadvantage

Multiple Choice

The file size will be smaller than lossless

• Advantage

• Disadvantage

Multiple Choice

The original file cannot be restored

• Advantage

• Disadvantage

Multiple Choice

The quality of the sound will be reduced.

• Advantage

• Disadvantage

Open Ended

Give the full form of MIDI.

Multiple Choice

MIDI uses a series of protocols and interfaces that allow lots of different types of musical instrument to connect and communicate.

• TRUE

• FALSE

Multiple Choice

MIDI allows one computer, or instrument, to control other instruments.

• TRUE

• FALSE

Multiple Choice

MIDI specifies pitch, duration, and velocity of each note of the sound

• TRUE

• FALSE

Multiple Choice

MIDI is a musical recording.

• TRUE

• FALSE

MIDI is NOT a musical recording.

It is a series of insructions for an instrument to carry out.

ADVANTAGES OF SERIAL DATA TRANSMISSION

Multiple Choice

Advantage of serial data transmission is (1) cheaper to manufacture, (2) likely to have interference, (3) can be used over long sdistances. What is the factor behind these advantages?

• Serial Data Transmission uses single wire

• Serial Data Transmission sends one bit at a time.

• Serial Data Transmission can be synchronised.

Multiple Choice

Advantage of serial data transmission is there is a less chance for the data to be skewed. What is the factor behind this advantage?

• Serial Data Transmission uses single wire

• Serial Data Transmission sends one bit at a time.

• Serial Data Transmission can be synchronised.

Multiple Choice

Advantage of serial data transmission is that it can reduce rate of errors. What is the factor behind this advantage?

• Serial Data Transmission uses single wire

• Serial Data Transmission sends one bit at a time.

• Serial Data Transmission can be synchronised.

Capacitive and Resistive TOuchscreen TechnologieS

Multiple Choice

This touch screen has multi-touch capabilities

• Capacitive

• Resistive

Multiple Choice

This touch screen cannot be used whilst wearing gloves

• Capacitive

• Resistive

Multiple Choice

This touch screen cannot be used whilst wearing gloves

• Capacitive

• Resistive

Multiple Choice

This touch screen is made up of two layers with a small

space in between

• Capacitive

• Resistive

Multiple Choice

This touch screen uses the electrical properties of the

human body

• Capacitive

• Resistive

Multiple Choice

This touch screen is normally cheaper to manufacture

• Capacitive

• Resistive

Multiple Choice

This touch screen has a quicker response time

• Capacitive

• Resistive

PRINCIPLE of operation of Keyboard

Open Ended

How does the keyboard work?

FUNCTIONS OF WEB BROWSER

Open Ended

Write two functions of a web browser. Separate your answers using a full stop ( . ) or a semicolon ( ; )

HTTP and HTTPS

Multiple Choice

Which one is secured?

• HTTP

• HTTPS

Open Ended

What is the full form of HTTPS?

Open Ended

What do you call the unsecured version of HTTPS?

Multiple Select

What are the two layers of HTTPS?

• TLS

• SSL

• SSD

• H

Multiple Choice

HTTPS uses encryption.

• TRUE

• FALSE

Logic Gates

Open Ended

Write a logic statement to match the given logic circuit.

Data Transmissions

Multiple Choice

All the bits of data are transmitted simultaneously on separate communication lines

• In serial transmission
• In communication transmission
• In parallel transmission
• In transfer transmission

Multiple Choice

^{This picture represent...}

• Parallel communication
• Serial communication

Multiple Choice

Bits are set sequentially down the same wire

• Serial

• Parallel

Multiple Choice

A 2 way police radio would be an example of what?

• Simplex Data Transmission

• Half Duplex Data Transmission

• Duplex Data Transmission

Multiple Choice

Full Duplex transmission is where:

• Data can only be transmitted in one direction
• Data can be transmitted in one direction at a time
• Data can be sent both ways at the same time
• A made up term to confuse us

Multiple Choice

Simplex transmission is where:

• Data can only be transmitted in one direction
• Data can be transmitted in one direction at a time
• Data can be sent both ways at the same time
• A made up term to confuse us

Multiple Choice

Duplex data transmission can be either serial or

parallel

• TRUE

• FALSE

Multiple Choice

Duplex data transmission is when data is transmitted

both ways, but only one way at a time

• TRUE

• FALSE

Multiple Choice

Duplex data transmission is always used to connect a

device to a computer

• TRUE

• FALSE

Multiple Choice

Duplex data transmission is when data is transmitted

both ways at the same time

• TRUE

• FALSE

Multiple Choice

Duplex data transmission automatically detects any

errors in data

• TRUE

• FALSE

Question 9(b)-11

Multiple Choice

9(b) Which data transmission is used by IC?

• serial

• parallel

Benefits of Using USB Connection

Multiple Choice

USB is likely to be compatible with most of the computers because...

• It is a universal standard

• It can only be inserted one way

• It is a high-speed connection

• It uses serial transmission

• It doesn’t require a (wireless) network

Multiple Choice

USB has less chance of connecting a device incorrectly because...

• It is a universal standard

• It can only be inserted one way

• It is a high-speed connection

• It uses serial transmission

• It doesn’t require a (wireless) network

Multiple Choice

In USB, data will be transmitted quicker because...

• It is a universal standard

• It can only be inserted one way

• It is a high-speed connection

• It uses serial transmission

• It doesn’t require a (wireless) network

Multiple Choice

USB has less chance of skewing / errors because...

• It is a universal standard

• It can only be inserted one way

• It is a high-speed connection

• It uses serial transmission

• It doesn’t require a (wireless) network

Multiple Choice

USB can be used if a network is down because...

• It is a universal standard

• It can only be inserted one way

• It is a high-speed connection

• It uses serial transmission

• It doesn’t require a (wireless) network

Multiple Choice

USB can be used few years from now because...

• It uses serial transmission

• It doesn’t require a (wireless) network

• It is backwards compatible

• It can power the device

• Drivers are automatically identified

Multiple Choice

USB can be used without separate source of power because...

• It uses serial transmission

• It doesn’t require a (wireless) network

• It is backwards compatible

• It can power the device

• Drivers are automatically identified

Multiple Choice

USB requires no installation of drivers because...

• It uses serial transmission

• It doesn’t require a (wireless) network

• It is backwards compatible

• It can power the device

• Drivers are automatically identified

Open Ended

10(a) Explain what is meant by a check digit and how it is used to detect errors.

Check Digit

​Check digit is a validation method used to check data entry. It is used to detect errors by adding a digit to the data. The data with the added digit will be recalculated and it will be compared to the original data. If the data are different, errors are detected; if it matches, no error detected.

10(b) Security Methods

Multiple Choice

It blocks any traffic that doesn’t meet the criteria / rules

• Firewall

• Strong Password

• Encryption

• Physical Security Methods

• Anti Spyware

Multiple Choice

It prevents brute force attacks.

• Firewall

• Strong Password

• Encryption

• Physical Security Methods

• Anti Spyware

Multiple Choice

It makes the data meaningless if stolen because it requires a key to decrypt the data.

• Firewall

• Strong Password

• Encryption

• Physical Security Methods

• Anti Spyware

Multiple Choice

The physical security (rooms or vaults) will need to be overcome.

• Firewall

• Strong Password

• Encryption

• Physical Security Methods

• Anti Spyware

Multiple Choice

It can remove any spyware from system

and it can prevent data being relayed to a third party.

• Firewall

• Strong Password

• Encryption

• Physical Security Methods

• Anti Spyware

11(a&b) RAM, ROM, SSD, HDD

Multiple Choice

It stores the data, instructions, and parts of OS that are currently in use.

• RAM

• ROM

• SSD

Multiple Choice

It stores the firmware, bootup instructions, and BIOS.

• RAM

• ROM

• SSD

Multiple Choice

It stores files and software.

• RAM

• ROM

• SSD

Multiple Choice

More durable; no moving parts.

• HDD

• SSD

Multiple Choice

It has a faster read / write / access speed

• HDD

• SSD

Multiple Choice

It uses more energy.

• HDD

• SSD

Multiple Choice

It is quieter.

• HDD

• SSD

Multiple Choice

It is affected by magnetic forces.

• HDD

• SSD

Multiple Choice

Takes less time to warm up.

• HDD

• SSD

Poll

Evaluate your understanding of the topics in this past year paper.

• Excellent

• Good

• Average

• Below Average

• Poor