OCR GCSE Computer Science Computer systems June 2024 question paper J277/01

The following table has either the binary or denary value of 3 numbers.

Complete the table by converting the 8-bit binary number into denary and the denary number into

Complete the table by writing the answer to each statement.

Show the result of a left binary shift of 4 places on the binary number 00001111.

Describe how to convert a 2-digit hexadecimal number into denary.

Use an example in your answer.

Add these two 8-bit binary numbers using binary addition.

Show your working out.

0 1 1 0 1 0 1 1

+ 0 0 0 0 1 1 1 1

An airport has computers that are connected together on a Local Area Network (LAN).

Each computer has an IP address and a MAC address.

Give one valid example of an IPv4 address and one valid example of an IPv6 address.

Describe the format of a MAC address.

The airport currently has wired connections in their Local Area Network.

Describe two benefits to the airport of using wired connections in their network.

Explain the reasons why the airport should also allow the network to be accessed using a wireless connection.

One office in the airport has five computers connected to one switch. There are two printers in the office that can be accessed by all computers.

The computers are connected using a star topology.

Draw a diagram to show how the five computers, switch and two printers are connected in a star topology.

Give one benefit and one drawback of the office using a star topology instead of a mesh topology.

Describe the role of the switch in the star topology.

A computer has an operating system and utility software.

The table contains operating system functions and a task that each function performs.

Complete the table by writing the two missing function names and a task performed by the two

Complete the description of utility system software using the words provided in the box. Not all words are used.

access amount apart compression consecutive

defragmentation deleted encryption key lock

quantity separate speed understood

........ software changes data using a........ If

the changed data is intercepted, it cannot be........ This software does

not stop the data from being intercepted.

........ software analyses the data on a disk to find files that have been split

and stored in separate locations. The split files are moved to be........ in

storage and the free space is moved together. This does not provide more storage space on the

disk, instead it makes the........ of the data faster because the read head

does not have to move as far to access the next part of the file.

4* A computer programmer has developed a computer game that they want to release for users to download over the internet. The programmer needs to decide whether to release the game as open source or proprietary software.

Discuss the features, benefits and drawbacks of each type of licence for this program and make a recommendation to the programmer.

You should include the following in your answer:

• features of each licence

• legal and ethical issues of each licence

• benefits and drawbacks of each licence.

A musician uses a computer to make and record music.

Tick (✓) one box to identify the correct description of sound sampling.

Explain how changing the bit depth will affect the sound file.

The musician has run out of storage space on their secondary storage device and needs to buy a replacement.

Identify whether the musician should buy a magnetic secondary storage device or a solid state secondary storage device for their computer.

Justify your choice.

Identify one other type of secondary storage.

Tick (✓) one box to identify the smallest secondary storage capacity.

The musician’s recordings have an average (mean) file size of 3 MB. The musician has 1000 recordings.

Calculate an estimate of the storage space in GB that the 1000 files will require, assuming they are each 3 MB in size. Show your working out.

Working space:

A computer has a Central Processing Unit (CPU).

Describe what happens during the fetch-execute cycle.

Complete the table by writing the name of two registers used in the fetch-execute cycle and the purpose of each register.

Give three characteristics of a CPU that can affect its performance.

A car has a ‘Follow Me’ system that uses a cruise control feature to allow the car to follow the car in front of it. It will keep the same speed and distance without the driver’s intervention. The cruise control system is an example of an embedded system.

Explain the reasons why the ‘Follow Me’ system is an example of an embedded system.

The car’s system has Read Only Memory (ROM) and Random Access Memory (RAM).

State two items that will be stored in the ROM for the ‘Follow Me’ system.

The RAM will store currently running data and instructions.

State three items of data that will be stored in the RAM for the ‘Follow Me’ system.

Explain why the ‘Follow Me’ system does not need virtual memory.