Oxford Computer Whiz 3rd Edition. Study Notes and Solved Exercises
Oxford Computer Whiz 3rd Edition. Study Notes and Solved Exercises
Lesson #1 Reviewing Computers
ANSWER THE FOLLOWING QUESTIONS
Q1: What are three important characteristics of computers?
Answer:
1. A computer is very accurate.
2. It stores all the information in its memory.
3. It can work continuously without stopping.
Q2: Which computer should banks use? State your reason.
Ans: Banks should use Mainframe computers because those are very powerful and stores a long data.
Q3: How is a supercomputer different from a mainframe?
Ans: Super computer works on a single problem at a time but mainframes can solve many problems at a time.
Q4: List the difference between analog and digital devices.
Ans: Devices that process analog data are analog devices. Devices that process digital data are called digital devices.
Q5: Define input and output device?
Ans: Devices used to enter data into the computer are called input devices. Devices used to display processed data are called output devices.
Lesson #2 Pioneers of Computers
ANSWER THE FOLLOWING QUESTIONS
Q1: Who was the Blaise Pascal and what did he invent?
Ans: Blaise Pascal was a mathematicians and he invent Pascaline calculator.
Q2: What did Lebniz develop? In what way he was successful?
Ans: The Labniz develop the Lebniz Calculator. He was successful because it can multiply and divide
Q3: Why is Babbage called the father of the modern computer?
Ans: Because all the computers today are based on his plans and ideas.
Q4: Why is Herman Hollerith considered a pioneer of computers?
Ans: Because of his inventions.
Lesson #3 About the CPU
ANSWER THE FOLLOWING QUESTIONS
Q1: Why is the CPU called the brain of the computers?
Ans: Because it controls and processes all the information in the computer.
Q2: Name the three components of the CPU.
Ans: (i) ALU
(ii)CU
(iii) MU
Q3: How is the ALU different from the CU?
Ans: The ALU calculates but CU directs different parts of the computer to carry out instructions.
Q4: Why are the disks in hard disk drive sealed in an air tight?
Ans: To protect from the dust.
Lesson # 4 Storing Data
ANSWER THE FOLLOWING QUESTIONS
Q1: List two main differences between RAM and ROM.
Ans: (1) RAM stands for random access memory.
ROM stands for read only memory.
(2) RAM is temporary memory.
ROM is permanent memory.
Q2: What do you understand by the term primary storage?
Ans: Primary storage can be directly accessed by the CPU.
Q3: Can a magnetic disk be used to store new data more than once?
Ans: Yes.
Q4: Name some commonly used secondary storage devices.
Ans: Hard drivers, CDs, DVDs, USB and Blue-ray disks.
Q5: Why is it important to make back-up copies of data on secondary storage devices?
Ans: The hard drive falls, and you can lose all your saved data .That is why it is important to make back-up copies.
Lesson # 5
Whiz through Software
Questions:
Q1: Define software.
Ans: Software is a set of instructions that tells the computer what to do and how to do it.
Q2: What is the difference between system software and application software?
Ans: System software is used to control and manage the different parts of a computer.
Application software is used to perform specific tasks on the computer.
Q3: Which software is used to design a brochure?
Ans: Desktop Publishing software.
Q4: What does data base management software enable you to do?
Ans: It enables us to manage, store and retrieve a large amount of data such as a mailing list.