IGCSE Computer Science Comprehensive (draft)

What is the binary representation of the denary number 13?

• 1100
• 1101
• 1110
• 1011

Which of these is NOT a unit of computer memory size?

• Kilobyte
• Megabyte
• Gigahertz
• Terabyte

In hexadecimal, what does the digit 'A' represent in denary?

• 8
• 10
• 12
• 14

What is the purpose of a parity bit in data transmission?

• To encrypt data
• To check for errors
• To increase speed
• To compress data

Which logic gate outputs TRUE only when both inputs are TRUE?

• OR
• AND
• NOT
• XOR

What is the primary function of an operating system?

• To compile code
• To manage hardware resources
• To design algorithms
• To store databases

Which input device uses ASCII codes to represent characters?

• Mouse
• Keyboard
• Scanner
• Microphone

What type of file compression retains all original data?

• Lossy
• Lossless
• Encrypted
• Compressed

In programming, what is a variable?

• A fixed value
• A named storage location
• A type of loop
• A hardware component

What does the fetch-execute cycle do in a computer?

• Encrypts data
• Processes instructions
• Compresses files
• Manages memory