IB CS Review 2 - 25/26

What does CPU stand for?

• Central Processing Unit
• Control Processing Unit
• Central Programming Unit
• Computer Processing Unit

Answer explanation

CPU stands for Central Processing Unit.

Which component performs arithmetic and logic operations?

• CU
• ALU
• RAM
• ROM

Answer explanation

The ALU (Arithmetic Logic Unit) performs these operations.

What does RAM stand for?

• Read Access Memory
• Random Access Memory
• Real-time Access Module
• Remote Access Memory

Answer explanation

RAM stands for Random Access Memory.

What type of memory is ROM?

• Volatile
• Random
• Non-volatile
• Temporary

Answer explanation

ROM is non-volatile—it retains data when power is off.

Which component fetches and decodes instructions?

• RAM
• CU
• ALU
• Hard Disk

Answer explanation

The Control Unit fetches, decodes, and executes instructions.

What is stored in registers?

• Data permanently
• Instructions temporarily
• Operating system
• User files

Answer explanation

Registers store data temporarily for immediate processing.

Which is the fastest type of memory?

• RAM
• Cache
• Hard Disk
• SSD

Answer explanation

Cache memory is the fastest and closest to the CPU.

What does the program counter hold?

• The result of last calculation
• The size of the program
• The address of the next instruction
• Error codes

Answer explanation

It stores the memory address of the next instruction.

What is the function of the data bus?

• Transmits instructions
• Carries memory addresses
• Carries data between CPU and memory
• Controls CPU speed

Answer explanation

The data bus transfers data between CPU and memory.

Which bus carries control signals?

• Data bus
• Address bus
• Instruction bus
• Control bus

Answer explanation

The control bus manages signals for operations.