OCR GCSE Computer Science Computer systems June 2023 question paper J277/01

Computers represent data in binary form.

Tick (✓) one box to identify the statement about binary that is true.

Complete the table by writing the missing denary, 8-bit binary or hexadecimal values.

Tick (✓) one box to identify the largest file size.

Tick (✓) two boxes to identify the two file sizes that are equal to each other.

Complete the binary addition by adding these two 8-bit binary numbers.

Show all your working.

0 1 1 1 0 0 0 1

+ 1 0 0 1 1 1 1 0

Identify the binary shift that has been applied to the 8-bit binary number 10110000 to get the result 10000000.

A student is performing a range of actions on the internet using their computer.

A range of protocols are used for the transmission of data by the student’s computer, and the web servers they are accessing.

Complete the table by identifying the most appropriate protocol for each of the tasks the

Some protocols have layers.

Give two reasons why protocols have layers.

The student’s computer is part of their home Local Area Network (LAN). The LAN currently only has wired connections.

One characteristic of a LAN is that they are set up over a small geographical area.

Give one other characteristic of a LAN.

Describe the benefits of the student changing their home LAN to include wireless connections.

State two drawbacks of changing their home LAN to include wireless connections.

Binary numbers can represent different forms of data.

One form of data is characters.

Complete the description of how computers represent characters in binary using the given list of terms. Not all terms will be used.

A character set stores........ of the characters that the computer can

represent. Each character is given a........ binary code. Lower-case and

upper-case letters in a character set are given........ binary codes.

One example of a character set is ASCII. This character set uses........

bits for each character. If the code value for the character ‘F’ is 70 then the code value for

the character ‘L’ is........

Binary numbers can also represent images.

The table shows the colours that are used in an image and the binary value for each colour.

The metadata states that the image is 3 pixels wide by 4 pixels high.

The data in the file starts in the top left of the image and goes from left-to-right, top-to-bottom.

State what is meant by metadata in an image file.

The binary data stored for the image is given: 000000000110100000101000011001100110000000101000

A grid is given for the image. Each square is one pixel.

Write the name of the colour in each square that the pixel will show for this image.

A colour depth of 4 is used. This means 4 bits are used to store the colour for each pixel.

State the maximum number of different colours that can be represented in 4-bits.

The colour depth is increased to 2 bytes.

State two effects that this change can have on the image.

A student has a text document and an image file that need to be compressed separately.

The student needs to reduce the file size of both of these files as much as possible.

Identify the most suitable type of compression for the text document. Justify your choice.

Type of compression........

Identify the most suitable type of compression for the image file. Justify your choice.

Type of compression........

Tick (✓) one or more boxes on each row to identify all of the methods that can help to prevent each threat.

Name and describe one threat to a computer system that is not given in question 4(a).

An artist has a computer that they use to create images.

Their computer has both hardware and software.

The hardware includes primary and secondary storage.

Explain why a computer needs both primary and secondary storage.

Give one example of a secondary storage device that the artist’s computer will have and an example of the data that will be stored on it.

Secondary storage device........

The computer has Virtual Memory (VM).

The table has four statements about VM. Not all of the statements are correct.

Tick (✓) the True column for the statements that are correct.

Re-write any statement that is incorrect in the False column by changing the statement to make it true.

The computer has an operating system and utility software.

State the need for utility software in a computer.

The artist uploads images to be displayed on a website. This is a client-server relationship.

Identify the computer that is acting as the client in this scenario and justify your choice.

Identify the computer that is acting as the server in this scenario and justify your choice.

The artist is working with a programmer on the development of a new piece of software.

The software will allow users to edit images on devices such as mobile telephones.

They are considering releasing the software as open source instead of proprietary.

Describe two benefits to the artist and programmer of releasing the software as proprietary.

Describe one benefit to the users of releasing the software as open source.

6* A shopping centre has a security system that includes CCTV cameras to record activities in the centre. The security system is being upgraded to include the use of facial recognition to identify, track the movements of and record individuals throughout the shopping centre.

Discuss the positive and negative impacts of this upgrade including:

• ethical issues

• privacy issues

• legal issues

A car comes with many embedded systems, for example parking sensors.

Identify one other embedded system that could be found in a car and explain why this is an embedded system.

Example embedded system........