OCR GCSE Computer Science J277 1.1 – Systems architecture

Processors have a speed measured in

• Hertz
• Bits
• Bytes
• Seconds

Data and Instructions in use are stored in the

• Processor
• Embedded System
• Hard Disk Drive
• Main Memory

Which of these doesn’t affect the performance of the computer?

• Clock Speed
• Number Of Cores
• Cache Size
• The Number Of Instructions In The Program

If the number of cores goes up from 2 to 4 – what is the exact effect on performance?

• Performance Decreases
• The maximum number of instructions executed per second doubles
• The maximum number of instructions executed per second quadruples
• The maximum number of instructions executed per second is quartered

What component holds the address of the next instruction

• Memory Address Register
• Memory Data Register
• Program Counter
• Accumulator

Results of calculations are held in this register

• Memory Address Register
• Memory Data Register
• Program Counter
• Accumulator

This holds the instruction/data temporarily after it is brought to the processor from the main memory

• Memory Address Register
• Memory Data Register
• Program Counter
• Accumulator

This would perform an operation such as 5+8

• Arithmetic Logic Unit
• Accumulator
• Cache
• Control Unit

What is the purpose of the accumulator?

• To perform arithmetic operations
• To hold the results of a calculation
• To hold the accumulation of instructions that have happened

Which registers hold an address?

• Program Counter

• Arithmetic Logic Unit

• Memory Data Register (MDR)

• Accumulator

• Memory Address Register (MAR)