As Hardware and communication (Unit 1)

Which component of contemporary computer architecture acts as the brain of the computer and executes the instructions of a computer program?

• CPU

• Memory

• Input / Output devices

• System bus

Answer explanation

The CPU, or Central Processing Unit, is responsible for carrying out the instructions of a computer program. It consists of the control unit, arithmetic logic unit (ALU), and registers. The CPU is often referred to as the brain of the computer because it performs the actual processing and execution of instructions.

What type of memory stores data and instructions that the CPU needs to access quickly?

• Primary memory

• Secondary memory

• RAM

• Control unit

Answer explanation

Random Access Memory (RAM) is a type of primary memory that stores data and instructions that the CPU needs to access quickly during program execution. RAM allows for fast and random access to stored information, making it essential for efficient operation of the computer.

Which component of contemporary computer architecture enables interaction between the computer and the external world?

• CPU

• Memory

• Input / Output devices

• System bus

Answer explanation

Input/Output (I/O) devices are responsible for facilitating interaction between the computer and the external world. These devices include keyboards, mice, monitors, printers, and networking devices. They allow for data input into the computer and output of processed information to the user or other devices.

What is the purpose of the system bus in contemporary computer architecture?

• To store data and instructions

• To perform arithmetic and logical operations

• To enable communication between CPU, memory, and I/O devices

• To control the execution of instructions

Answer explanation

The system bus is a communication pathway that connects the CPU, memory, and I/O devices in a computer system. It consists of the address bus, data bus, and control bus. The system bus allows for the transfer of data, instructions, and control signals between these components, enabling their coordinated operation.

Which type of memory is fast, directly accessible by the CPU, and loses its content when the power is turned off?

• Primary storage (RAM)

• Secondary storage

• Cache memory

• Optical drives

Answer explanation

Primary Memory, specifically Random Access Memory (RAM), is fast and directly accessible by the CPU. It stores data and instructions actively used during program execution. RAM is volatile, meaning its content is lost when the power is turned off. It provides temporary storage for the CPU to work with data and instructions efficiently.

What is the purpose of secondary memory in a computer system?

• It provides fast and direct access to data and instructions.

• It stores data and instructions that are actively used during program execution.

• It provides long-term storage and retains data even when power is off.

• It acts as a buffer, reducing memory access latency.

Answer explanation

Secondary memory, such as hard disk drives (HDDs), solid-state drives (SSDs), and optical drives, provides long-term storage in a computer system. Unlike primary memory (RAM), secondary memory is non-volatile, meaning it retains data even when the power is turned off. It is used for storing files, programs, and other data that are not actively used during program execution.

What is the purpose of caching in computer systems?

• To provide long-term storage for data and instructions.

• To reduce the latency associated with memory access.

• To facilitate direct communication between the CPU and I/O devices.

• To perform arithmetic and logical operations.

Answer explanation

Caching is a technique used to improve memory access speed in computer systems. It involves storing frequently accessed data or instructions in a smaller and faster cache memory located closer to the CPU. By having a cache memory, the system can reduce the latency associated with accessing data from the main memory, which is slower in comparison. Caching improves overall system performance by minimizing the time spent waiting for memory accesses.

Which method of parallel processing utilizes multiple cores within a single processor?

• Multi-core Processors

• Distributed Processing

• Parallel Algorithms

• GPU (Graphics Processing Unit)

Answer explanation

Multi-core processors have multiple cores within a single processor, allowing for parallel execution of instructions. Each core can work on a separate task simultaneously, increasing the overall processing speed. This method is commonly used in modern processors to enhance performance.

What does distributed processing involve?

• Simultaneous execution of multiple instructions on a single core

• Combining the results of multiple processors to obtain the final solution

• Designing parallel algorithms to break down a problem into smaller parts

• Dividing the workload among multiple computers or processors

Answer explanation

Distributed processing involves dividing the workload among multiple computers or processors. Each processor handles a portion of the problem, and the results are combined to obtain the final solution. This method allows for parallel processing by leveraging the power of multiple machines working together.

Which type of algorithms are designed to exploit parallel processing capabilities?

• Multi-core Algorithms

• Distributed Algorithms

• Sequential Algorithms

• Parallel Algorithms

Answer explanation

Parallel algorithms are specifically designed to exploit parallel processing capabilities. They break down a problem into smaller parts that can be solved concurrently, utilizing multiple processors or cores efficiently. Parallel algorithms help achieve faster solutions by taking advantage of parallel execution.