GCSE Edexcel Computer Science
Revision Questions With All Correct
Answers 2025
/. What does a Compiler do? - Answer-A compiler takes the source code as a whole
and translates it into machine code all in one go. Once converted, the machine code
can be run at any time.
/.What are issues relating to AI? - Answer-- Accountability
- Safety
- Algorithmic Bias
- Legal Liability
/.What is Algorithmic Bias caused by? - Answer-- Inaccurate data to train the machine
- Insufficient sample data
- Unrepresentative data
- Non-aspirational data
/.What is Algorithmic Bias? - Answer-Bias that is inherent in the machine learning
algorithm itself.
/.What are the steps for 2's Complement? - Answer-- Start at the LSB
- Keep all bits the same up to and including the first 1
- Flip everything after that
/.What is Bandwidth? - Answer-The maximum volume of data that can be transferred
per second.
/.What is a LAN? - Answer-A LAN is a Local Area Network that is based across a single
site or building
/.What is a WAN? - Answer-A WAN is a Wide Area Network that covers a large
geographical area and uses a variety of transmission media.
/.What is Latency? - Answer-The time between the data being sent and the data being
received.
/.What is Latency measured in? - Answer-Milliseconds (ms)
/.What does FTTC stand for? - Answer-Fibre to the Cabinet
/.What does FTTP stand for? - Answer-Fibre to the Premises
, /.What is Packet Switching? - Answer-Packet Switching is when data is broken down
into packets which are sent along the path which has the least traffic. This means that
packets may take different routes.
/.How do you calculate Image File Size? - Answer-Height x Width x Bit Depth
/.How many bits are in a Crumb? - Answer-2
/.How many bits are in a Nibble? - Answer-4
/.How many bits are in a Byte? - Answer-8
/.What base is Binary? - Answer-Base 2
/.What base is Denary? - Answer-Base 10
/.What base is Hexadecimal? - Answer-Base 16
/.How do you calculate Time? - Answer-Time = Filesize/Transfer Speed
/.How do you calculate Transfer Speed? - Answer-Transfer Speed = Filesize/time
/.How do you calculate Filesize? - Answer-Filesize = Transfer Speed x Time
/.What are the typical frequencies for Wifi? - Answer-- 2.4Ghz
- 5Ghz
/.What are the types of Wireless Communications? - Answer-- Bluetooth
- Zigbee
- Radio Frequency Identification (RFID)
- Near Field Communication (NFC)
/.Properties of Copper UTP? - Answer-- Untwisted pair cable
- Uses electrical pulses
- Range = 100 metres
- Speed = 10Gbps
- Latency = High because copper is susceptible to interference
/.Speed of Copper UTP? - Answer-10Gbps
/.Range of Copper UTP? - Answer-100 metres
/.Latency of Copper UTP? - Answer-High because copper is susceptible to interference
/.What is in the Header of a data packet? - Answer-- IP address of sender
Revision Questions With All Correct
Answers 2025
/. What does a Compiler do? - Answer-A compiler takes the source code as a whole
and translates it into machine code all in one go. Once converted, the machine code
can be run at any time.
/.What are issues relating to AI? - Answer-- Accountability
- Safety
- Algorithmic Bias
- Legal Liability
/.What is Algorithmic Bias caused by? - Answer-- Inaccurate data to train the machine
- Insufficient sample data
- Unrepresentative data
- Non-aspirational data
/.What is Algorithmic Bias? - Answer-Bias that is inherent in the machine learning
algorithm itself.
/.What are the steps for 2's Complement? - Answer-- Start at the LSB
- Keep all bits the same up to and including the first 1
- Flip everything after that
/.What is Bandwidth? - Answer-The maximum volume of data that can be transferred
per second.
/.What is a LAN? - Answer-A LAN is a Local Area Network that is based across a single
site or building
/.What is a WAN? - Answer-A WAN is a Wide Area Network that covers a large
geographical area and uses a variety of transmission media.
/.What is Latency? - Answer-The time between the data being sent and the data being
received.
/.What is Latency measured in? - Answer-Milliseconds (ms)
/.What does FTTC stand for? - Answer-Fibre to the Cabinet
/.What does FTTP stand for? - Answer-Fibre to the Premises
, /.What is Packet Switching? - Answer-Packet Switching is when data is broken down
into packets which are sent along the path which has the least traffic. This means that
packets may take different routes.
/.How do you calculate Image File Size? - Answer-Height x Width x Bit Depth
/.How many bits are in a Crumb? - Answer-2
/.How many bits are in a Nibble? - Answer-4
/.How many bits are in a Byte? - Answer-8
/.What base is Binary? - Answer-Base 2
/.What base is Denary? - Answer-Base 10
/.What base is Hexadecimal? - Answer-Base 16
/.How do you calculate Time? - Answer-Time = Filesize/Transfer Speed
/.How do you calculate Transfer Speed? - Answer-Transfer Speed = Filesize/time
/.How do you calculate Filesize? - Answer-Filesize = Transfer Speed x Time
/.What are the typical frequencies for Wifi? - Answer-- 2.4Ghz
- 5Ghz
/.What are the types of Wireless Communications? - Answer-- Bluetooth
- Zigbee
- Radio Frequency Identification (RFID)
- Near Field Communication (NFC)
/.Properties of Copper UTP? - Answer-- Untwisted pair cable
- Uses electrical pulses
- Range = 100 metres
- Speed = 10Gbps
- Latency = High because copper is susceptible to interference
/.Speed of Copper UTP? - Answer-10Gbps
/.Range of Copper UTP? - Answer-100 metres
/.Latency of Copper UTP? - Answer-High because copper is susceptible to interference
/.What is in the Header of a data packet? - Answer-- IP address of sender
