Answer the following questions.
a. What is a computer system?
b. What is an input device? Name some of the popular input devices.
c. What is the difference between a mouse and a trackball?
d. Web cameras can be used to check security in a bank. Comment.
e. What is the role of the CPU in the computer system?
f. What is a monitor? Name the two basic types of monitors used today.
g. What is a printer? What are the two categories of printers?
h. Differentiate between impact and non-impact printers.
i. What is a digital projector? How is it different from a computer screen?
j. A DVD-ROM can store more data than a CD-ROM of the same size. Comment.
k. What is a secondary memory? List its types.
l. What is a flash drive? What is it used for?
Answer (2)
A computer system consists of hardware and software working together to perform tasks. Input devices like keyboards and mice allow users to interact with computers, while the CPU processes data and manages tasks. Printers, monitors, and secondary storage solutions like flash drives play critical roles in the functionality and usability of computer systems.
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Here are the detailed answers to each part of the question, related to computer systems:
a. What is a computer system? A computer system is an assembly of various components such as a CPU, memory, storage, and input/output devices that work together to perform computing tasks. It processes data according to a set of instructions called a program.
b. What is an input device? Name some of the popular input devices. An input device is a hardware component used to enter data and control signals into a computer. Some popular input devices include:
Keyboard
Mouse
Trackball
Microphone
Scanner
Web camera
c. What is the difference between a mouse and a trackball? A mouse is an input device used to point, select, and interact with items on a computer screen; it moves on a surface to position the cursor. A trackball, on the other hand, is a stationary device with a rolling ball that you manipulate with your fingers to move the cursor.
d. Web cameras can be used to check security in a bank. Comment. Web cameras provide real-time video capture and can be used in banks to enhance security by monitoring activity in and around banking areas. They help deter crime and offer evidence in case of security incidents.
e. What is the role of the CPU in the computer system? The CPU, or Central Processing Unit, acts as the brain of the computer. It carries out instructions from programs by performing basic arithmetic, logic, control, and I/O operations, essentially executing the computing processes.
f. What is a monitor? Name the two basic types of monitors used today. A monitor is an output device that displays visual information from the computer. The two basic types of monitors used today are:
LCD (Liquid Crystal Display)
LED (Light Emitting Diode)
g. What is a printer? What are the two categories of printers? A printer is an output device that produces a paper copy of digital documents. The two categories of printers are:
Impact printers (e.g., dot matrix printers)
Non-impact printers (e.g., inkjet and laser printers)
h. Differentiate between impact and non-impact printers. Impact printers physically strike the paper to produce text and images, like a typewriter. Non-impact printers, on the other hand, use different methods (such as spraying ink or using laser technology) to print without directly touching the paper.
i. What is a digital projector? How is it different from a computer screen? A digital projector is an output device that projects visual content from a computer onto a large surface, such as a screen or wall. Unlike a computer screen or monitor, which displays content for a single user, a projector is suitable for presentations to larger audiences.
j. A DVD-ROM can store more data than a CD-ROM of the same size. Comment. Yes, a DVD-ROM can store significantly more data than a CD-ROM despite having the same physical dimensions. DVDs have higher data density due to a tighter data track and smaller pit size, which enhances their storage capacity.
k. What is secondary memory? List its types. Secondary memory, also known as auxiliary storage, is where data is stored long-term. It is non-volatile, meaning data is not lost when the computer is turned off. Types of secondary memory include:
Hard disk drives (HDD)
Solid-state drives (SSD)
Optical discs (CDs, DVDs)
USB flash drives
l. What is a flash drive? What is it used for? A flash drive is a small, portable storage device that uses flash memory to store data. It is commonly used to transfer files between devices and for backup and storage of data files like documents, photos, and videos.
