Mock prep - IGCSE

How is data read from an HDD?

• Photon sensors detect binary patterns
• Magnetic changes detected by a read head
• Electric pulses read from SSD chips
• Laser reflects off pits

Which of the following describes a logic error in programming?

• The program does not run at all
• The program runs but produces incorrect results
• The program crashes unexpectedly
• The program takes too long to execute

What is the main role of ROM in a computer system?

• To store user data
• To store startup instructions
• To increase processing speed
• To temporarily store data in use

Which unit is best to express a 5MB image file size?

• Gigabytes
• Kilobytes
• Mebibytes
• Bits

Which software manages CPU scheduling and memory allocation?

• Interpreter
• Operating System
• Word Processor
• Spreadsheet

What type of model uses independent agents working together?

• Single-core
• Sequential
• Parallel
• Multi-agent

What is one benefit of using a simulation?

• Replaces all real-world experiments
• Runs without electricity
• Always 100% accurate
• Cheaper than real-world testing

What is the denary equivalent of the binary 1010 0001 (unsigned)?

• 225
• 193
• 129
• 161

How does an optical disc store data?

• By pits and lands read by laser
• By magnetic polarity
• By solid-state transistors
• By rotating capacitors

What does a left shift operation do to a binary number?

• It adds a zero at the end
• It rotates the digits
• It doubles the value
• It halves the value