iGCSE-Recap_Quiz (unit 1-5)

Which number system do computers use to represent data?

• Decimal
• Binary
• Hexadecimal
• Octal

What is the purpose of ASCII and Unicode?

• To store images in a compressed format
• To represent text characters as binary codes
• To transmit data over a network
• To encrypt data for security

Which factors affect the quality and file size of a digital sound recording?

• Sample rate and sample resolution
• Image resolution and color depth
• File compression method
• Network bandwidth

What is a pixel?

• A type of file compression
• A unit of data storage
• A point of light that makes up a digital image
• A network protocol

What is the difference between lossless and lossy data compression?

• Lossless compression is faster than lossy compression
• Lossless compression preserves all original data, while lossy compression removes some data
• Lossless compression is used for images, while lossy compression is used for audio
• Lossless compression results in smaller file sizes than lossy compression

What is a data packet?

• A unit of data storage
• A type of error detection method
• A segment of data transmitted over a network
• A type of encryption algorithm

What is packet switching?

• A method for storing data in a database
• A technique for transmitting data packets independently across a network
• A type of error correction code
• A way to encrypt data for secure transmission

Which data transmission method sends data one bit at a time?

• Parallel
• Serial
• Simplex
• Half-duplex

What is the advantage of parallel data transmission over serial transmission?

• Greater reliability over long distances
• Higher speed
• Lower cost
• Better security

What is full-duplex data transmission?

• One-way transmission
• Two-way transmission, but not simultaneous
• Simultaneous two-way transmission
• Transmission with built-in error correction