Here are 20 multiple-choice questions based on the document "Introduction to Computers" along with their answers:
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20 QUESTIONS BASED ON INTRODUCTION TO COMPUTERS ALONG WITH THEIR ANSWERS
Understanding Digital, Analog, and Hybrid Computers: Differences and Applications
In Summary:
Digital Computers:
Digital computers operate using discrete values and are the most common type of computer. They use binary digits, or bits, which have two possible states: 0 or 1. Digital computers process information in a step-by-step manner, where each step involves performing logical operations on these binary values. They are highly accurate and precise, making them suitable for handling complex calculations and executing algorithms. Examples of digital computers include personal computers, laptops, servers, and smartphones.
Analog Computers:
Analog computers, on the other hand, work with continuous values. They represent and manipulate data in a physical, continuous form such as voltages, currents, or other measurable quantities. Analog computers are designed to model and solve mathematical equations by using physical phenomena to represent and compute values. They are particularly useful for tasks involving real-world phenomena, such as simulating fluid dynamics or electrical circuits. However, analog computers are less precise than digital computers and are more susceptible to noise and inaccuracies. Examples of analog computers include slide rules, analog oscilloscopes, and certain scientific instruments.
Hybrid Computers:
Hybrid computers combine the features of both digital and analog computers. They use digital components for performing logical operations and processing discrete data, while also incorporating analog components to handle continuous data. Hybrid computers are often employed in scientific and industrial applications that require both precise calculations and real-time monitoring of physical quantities. For instance, in a nuclear power plant, a hybrid computer can perform complex calculations using digital components while monitoring and controlling analog readings from various sensors.
Discrete Values:
Discrete values are separate and distinct values that can be represented individually. In the context of computing, discrete values are typically binary, taking on either a 0 or 1 state. Digital computers operate with discrete values, processing and manipulating binary data in discrete steps.
Continuous Values:
Continuous values, on the other hand, are unbroken and can take on any value within a range. They represent quantities that can vary infinitely, such as time, temperature, or voltage. Analog computers work with continuous values, using physical phenomena to represent and process these continuous quantities.
In summary, digital computers process discrete values using binary digits (0s and 1s), analog computers work with continuous values using physical representations, and hybrid computers combine elements of both digital and analog technologies to handle both discrete and continuous data.
WHAT IS MODULATION?
Differentiate between Analogue and Digital data.
Distinguish between cold booting and warm booting.
State three features of fifth generation computers.
Features of fifth generation computers
Headache, back and neck pain may result from the use of computers.
State how each of them can be minimised.
Headache
State the hardware technological differences between the second generation and the third generation computers. (2 marks)
State two ways of ensuring proper ventilation in a computer room. (2 marks)
State two advantages of using portable computers.
Advantages of portable computers
State two circumstances under which warm booting of a computer may be necessary.
Reasons for warm booting a computer
Differentiate between analogue data and digital data as used in computers. (2 marks)
State three functions of Un-uninterruptible Power Supply (UPS). (3 marks)Functions of the UPS
Explain two health issues that could arise from the use of an unsuitable computer desk.
State two reasons for the increased use of laptop computers in government offices. (2 marks)
Reasons for the preference for laptops.
State four characteristics which make computers better than human beings.
State two reasons why it is necessary to use standard furniture in a computer laboratory.
A computer teacher put a rule that diskettes should not be used in the computer laboratory(a) Give a reason for the rule
Name four toggle keys on a standard computer keyboard
Describe each of the following types of computers: hybrid; and embedded.
(a) (i) What is a computer keyboard? (1mk)
Input device with keys for keying in data in the form of characters
List four types of keys found on a computer keyboard. Give an example of each. (4mks)(a) List five precautions that can be taken to protect data stored in diskettes (5mks)List three differences between a microcomputer and a super computer (3mks)Microcomputers
Supercomputers
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