4 J277 1.1 Characteristics of CPUs

Which of the following factors is NOT mentioned as affecting the speed of a racing car in the analogy used to explain CPU performance?

• Horsepower of the engine

• Tyres

• Color of the car

• Driver's overall skill

What is the unit of measurement for clock speed in CPUs?

• Bytes

• Hertz

• Meters

• Volts

What is the purpose of the cache in a CPU?

• To store all the contents of main memory

• To temporarily store instructions and data being read from and written to the main memory

• To increase the size of the main memory

• To control the clock speed of the CPU

Why can't we say that with a three-gigahertz processor, there are three billion instructions being executed per second?

• Because the clock speed is not measured in gigahertz

• Because the whole cycle is controlled by the control unit and the CPU's internal clock

• Because the CPU can only execute one instruction per second

• Because the CPU's clock speed is not related to the number of instructions executed

Why is it beneficial to have more instructions and data stored in the cache?

• It increases the size of the main memory

• It allows the CPU to operate without a control unit

• It makes the CPU more efficient by reducing the need to fetch data from the main memory

• It increases the clock speed of the CPU

What is the most important factor affecting a CPU's overall performance?

• A. The number of cores

• B. The size of the cache

• C. The clock speed

• D. The type of specialized processors

Why doesn't doubling the number of cores in a CPU directly double its speed and efficiency?

• A. Because cores do not communicate with each other

• B. Because it increases the cache size

• C. Because it requires more power

• D. Because cores need to communicate with each other, which takes time and efficiency