OCR GCSE Computer Science Computer systems June 2022 question paper J277/01

Computers represent data in binary form.

Tick (✓) one box in each row to identify the binary unit equivalent of each of the given file

Convert the denary number 221 into 8 bit binary. Show your working.

Convert the hexadecimal number 2F into denary. Show your working.

Convert the binary number 10110000 into hexadecimal.

Identify how many unique values can be represented by 4 bits.

Perform a binary shift of 3 places right on the binary number 10001110.

Complete the table by writing the missing definition or name of each of the common CPU

A library has a LAN (Local Area Network).

The LAN allows access by both wired and wireless devices.

Users have reported that the network sometimes runs very slowly.

Explain why the number of devices using the network at the same time can affect the performance of the network.

Identify one other factor that can affect the performance of the network.

The wired connection is an Ethernet connection. Ethernet is considered a standard.

Explain why Ethernet is a standard.

The network has several routers.

Identify three tasks carried out by a router.

The library does not use encryption when data is transmitted through the network.

Give two reasons why the library should use encryption.

Protocols are used to transmit data through the network and over the internet.

Identify one protocol that can be used to perform each of the following tasks:

Access a website securely........

4* Social networking websites use artificial intelligence (AI) to monitor posts from users.

Discuss the positive and negative uses of AI by social networking websites including:

• Legal issues

• Ethical issues

• Privacy issues

A software development company wants to protect their computer systems and data from unauthorised access.

Identify two methods of physical security that the company could use to protect their computer systems.

Identify and describe two software-based security methods that the company can use to protect their computer systems and data.

Tick (✓) one box on each row to identify the legislation that would cover each of the given

A student is creating a range of documents for a school project.

The student records a podcast about computer science.

Describe how an analogue sound wave is converted into digital form.

Tick (✓) one or more boxes on each row to identify the effect(s) that each change will have on the sound file.

The student writes a report about volcanoes.

The computer stores text using the ASCII character set.

Part of the ASCII character set is shown:

Identify the character that will be represented by the ASCII denary code 84.

Identify a second character set.

The student takes a photograph of their science experiment. The image file includes metadata.

Identify three pieces of metadata that is often stored with an image.

The student compresses all their documents before emailing them to their teacher.

Give two benefits of compressing the data before it is emailed.

Explain why lossy compression may not be appropriate to compress all of the student’s files.

A smart television allows the user to search the Internet and watch videos online.

The smart television has both RAM and ROM.

State the difference between RAM and ROM.

Give two examples of data that the smart television could store in RAM.

The smart television has secondary storage.

State, using an example, why the smart television needs secondary storage.

Identify one appropriate type of secondary storage for the smart television. Justify your choice.

Secondary storage type........