Lesson 1 TECHNOLOGY TROUGH THE YEARS In history‚ people have always sought out ways to make things easier to do and to understand. This is the reason why‚ after so many thousands of years‚ a simple tool like the wheel is now more than just a wooden disk that rolls on the ground. It is also the reason why a conversation is now possible between people who are on opposite sides of the world; and why information‚ which used to be found only in books‚ can now be accessed from the Internet with a computer
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Exercises #1. How many cells can be in a computer’s main memory if each cell’s address can be represented by two hexadecimal digits? What if four hexadecimal digits are used? Explain your answer. Answer: Hexadecimal digits is a base 16 number system and it ranges between 0 and F i.e. 0 - 9 and A - F (10 -15). (Table 1 below shows binary‚ decimal and hexadecimal representation). Two hexadecimal digits will be between 00 and FF and this will make up to 256 cells i.e. 0 – 255 (16 bits) and for four
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[2 marks] (5) A student is to answer 10 out of 15 questions on the exam. (a) How many choice that he has? [2 marks] (b) How many choice that he must answer at least three of the first five questions. [4 marks] (6) Each user on a computer system has a password‚ which is six to seven characters long‚ where each character is an uppercase letter or a digit. Each password must contain at least three digits. How many possible passwords are there? [8 marks] (7) By rearranging the letters in
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Memory D. A processor 11. System software is the set of programs that enables your computer’s hardware devices and ____________ software to work together. A. management B. processing C. utility D. application 15 12. The PC (personal computer) and the Apple Macintosh are examples of two different: A. platforms. B. applications. C. programs. D. storage devices. 13. Apple Macintoshes (Macs) and PCs use different ____________ to process data and different operating systems. A. languages B. methods
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can tolerate variable latency operations by reducing the number of serial additions required for the multiplication. The number of serial additions depends on the data (multiplicand) Worst case 8-bit multiplicand requires 8 additions Parallel systems generally are designed considering for worst case hardware and latency requirements. But as a darker side Booth-2 algorithm does not significantly reduce the worst case number of partial
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COSC 101: COMPUTER LITERACY QUIZ CHAPTER-2 Name_______________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) ________ is data that has been organized or presented in a meaningful fashion. 1) _______ A) A number B) Information C) A symbol D) A character 2) Which of the following is NOT one of the four major data-processing functions of a computer
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Chapter 1 Study Guide 1. What numbering system is used in most electronic devices? (4) Computers record the ideas they work with electronically‚ as bits‚ and these bits represent either a 1 or a 0 2. Define the following: a. Bit – The smallest unit of data stored in a computing device‚ representing a single binary digit of value 1 or 0 b. Byte – A unit of data in a computer‚ it is made up of 8 bits c. Word – Two bytes of computer memory‚ or 16 bits d. Double Word – Two words of computer memory
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understand typed or written instructions or data. Whenever data or instructions or input to the computer it is first converted to 0s and 1s‚ these are called binary digits (bits). There are a number of methods that are used to represent data in computer system‚ namely: 1. Binary Representation 2. ASCII - American Standard Code for Information Interchange 3. EDCDIC - Extended Binary Coded Decimal Interchange Code 4. Binary Coded Decimal (BCD) 5. Sign-and-magnitude
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Name: Bryan Westall NT1210 Lab 1.1 Lab 1.1: Reading Binary Exercise 1.1.1 Create a mapping similar to Figure 1-1 for the decimal number 2931 using either paper and pencil or a Word document. Exercise 1.1.2 Create a mapping similar to Figure 1-2 for the binary number 1102 using either paper and pencil or a Word document. 1102=7 (128) 27 (64) 26 (32) 25 (16) 24 (8) 23 (4) 22 (2) 21 (1) 20 1 1 0 Exercise 1.1.3 Create a mapping similar to Figure 1-2 for the
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constituting a non-causal medium‚ due to the possibility to access any pixel of the image at random. In addition‚ the hidden information could remain invisible to the eye. However‚ the image steganography techniques will exploit "holes" in the Human Visual System (Hamid‚ N. et al. 2012) Scientific Review As the computer‚ the internet and the Digital Signal Processing (DSP) started to boost‚ steganography has gone digital (Cheddad‚ A. and Condell‚ J. 2010). The popular images to try steganography are
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