I/O hardware basics in Operating Systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding I/O Device Roles

Which of the following best describes the primary role of an input/output (I/O) device in a computer system?

A It facilitates communication between the computer and the external environment.

B It stores data permanently for long-term use.

C It processes data internally without communicating with other components.

D It manages the computer's power supply and battery life.

💡 Hint

Think about how a computer interacts with users or other machines.

I/O devices allow the computer to send data out and receive data from the outside world, such as keyboards, monitors, and printers.

📋 Factual

intermediate

Types of I/O Devices

Which of the following is NOT typically considered an input device?

A Scanner

B Mouse

C Monitor

D Keyboard

💡 Hint

Input devices send data to the computer; output devices receive data from the computer.

A monitor displays information from the computer and is an output device, not an input device.

🔍 Analysis

advanced

Data Transfer Methods in I/O Hardware

Consider these three data transfer methods used by I/O devices: Programmed I/O, Interrupt-driven I/O, and Direct Memory Access (DMA). Which statement correctly compares their efficiency?

A Programmed I/O is the most efficient because it uses CPU cycles only when needed.

B DMA requires the CPU to manage every byte transferred, making it the least efficient.

C All three methods use the CPU equally and have the same efficiency.

D Interrupt-driven I/O reduces CPU idle time by allowing the CPU to perform other tasks until interrupted.

💡 Hint

Think about how the CPU is involved in each method and when it is free to do other work.

Interrupt-driven I/O allows the CPU to work on other tasks until the device signals it, improving efficiency over programmed I/O. DMA transfers data directly without CPU intervention, which is even more efficient than interrupt-driven I/O.

❓ Comparison

advanced

Comparing I/O Device Speeds

Which of the following correctly ranks these I/O devices from fastest to slowest in typical data transfer speed?

A SSD > USB Flash Drive > HDD

B USB Flash Drive > SSD > HDD

C Solid State Drive (SSD) > Hard Disk Drive (HDD) > USB Flash Drive

D HDD > SSD > USB Flash Drive

💡 Hint

Consider the technology behind each device and typical speed benchmarks.

SSDs use fast flash memory and have higher speeds than USB flash drives, which are generally faster than traditional HDDs that rely on mechanical parts.

❓ Reasoning

expert

Impact of I/O Bottlenecks on System Performance

A computer system has a very fast CPU and memory but uses a slow I/O device for data input. What is the most likely effect on overall system performance?

A The CPU will run at full speed without any delays.

B The slow I/O device will cause the CPU to wait, reducing overall system speed.

C The system will automatically speed up the I/O device to match the CPU speed.

D The slow I/O device will only affect storage capacity, not speed.

💡 Hint

Think about how the CPU depends on data availability from I/O devices.

If the I/O device is slow, the CPU often waits for data, causing a bottleneck that slows down the entire system despite the CPU's speed.